575 research outputs found
Bringing light into deep-sea biodiversity (cover)
No full textARBIZU, PEDRO MARTÍNEZ, BRIX, SASKIA (2008): Bringing light into deep-sea biodiversity (cover). Zootaxa 1866 (1): 1-4, DOI: 10.11646/zootaxa.1866.1.1, URL: http://dx.doi.org/10.11646/zootaxa.1866.1.
FIGURE 2 in Two new species of the genus Pseudomesus Hansen, 1916 (Isopoda, Asellota) from the Southern hemisphere: Pseudomesus pitombo sp. nov. and Pseudomesus satanus sp. nov.
No full textFIGURE 2. Pseudomesus pitombo sp. nov., holotype male (ZMH K–41066). A–G, pereopods 1–7. Scale bar = 100 µm.Published as part of Kaiser, Stefanie & Brix, Saskia, 2007, Two new species of the genus Pseudomesus Hansen, 1916 (Isopoda, Asellota) from the Southern hemisphere: Pseudomesus pitombo sp. nov. and Pseudomesus satanus sp. nov., pp. 21-38 in Zootaxa 1658 on page 25, DOI: 10.5281/zenodo.27401
FIGURE 1 in First genetic data for species of the genus Haploniscus Richardson, 1908 (Isopoda: Asellota: Haploniscidae) from neighbouring deep-sea basins in the South Atlantic
No full textFIGURE 1. CO1 Bayesian phylogenetic tree based on the 658 bp alignment. Branch support shows the ML / MP bootstrap values / posterior probabilities, respectively. (CB) = Cape Basin, (AB) = Angola Basin, (GB) = Guinea basin, (ARB) = ArgentinianBasin.Published as part of Brix, Saskia, Riehl, Torben & Leese, Florian, 2011, First genetic data for species of the genus Haploniscus Richardson, 1908 (Isopoda: Asellota: Haploniscidae) from neighbouring deep-sea basins in the South Atlantic, pp. 79-84 in Zootaxa 2838 on page 82, DOI: 10.5281/zenodo.20172
Pseudomesus satanus Kaiser & Brix, 2007, sp. nov.
No full text<i>Pseudomesus satanus</i> sp. nov. <p>(Figs 7–9)</p> <p> <b>Material examined.</b> Holotype: Ψ (preparatory, 1.7 mm), Australian continental slope, 38°23.95'S, 149°17.02'E, RV <i>Franklin</i>, Station SLOPE 67, 1277– 1119 m, leg. G.C.B Poore, NMV J18597.</p> <p> <b>Diagnosis.</b> <i>Body</i> length 6.2 times longer than width of pereonite 2. <i>Cephalothorax</i> with 2 cephalic spines and a row of small setae on frons. <i>Antennula</i> with 5 articles, article 2 length 3.4 times width, 1.5 times article 1 length; with serration resembling 4 “teeth” and with 3 broom setae distally. <i>Pleotelson</i> inflated dorsally, length subequal width, lateral margins convex, tapering to posterior margin. <i>Uropods</i> uniramous, bulbous, not overlapping posterior margin of pleotelson, overlapping anus valves; endopod length 1.5 times protopod length, 1.9 times longer than wide.</p> <p> <b>Description.</b> <i>Habitus</i> of female holotype (Fig. 7 A): <i>Body</i> 1.7 mm long (measured without appendages), length 6.2 times pereonite 2 width. Pereonite 1 width 1.1 times cephalothorax width in dorsal view. <i>Frons clypeal furrow</i> present, 2 cephalic spines and a row of small setae on frons. <i>Pereonite 1</i> length 0.8 times pereonite 2 length, 1.1 times pereonite 2 width. Pereonite 5 anterior and lateral margins straight. <i>Coxae</i> 1–4 slightly produced, without setae. <i>Pleotelson</i> dorsally inflated, length 1.2 times width, posterolateral spines absent. Lateral margins convex, tapering towards posterior margin.</p> <p> <i>Antennula</i> (Fig. 7 B) about 0.25 mm long, length 0.2 times body length, with 5 articles. Article 1 with 3 broom setae. Article 2 length 3.4 times width, 1.5 times article 1 length; with serration resembling 4 “teeth” and 3 broom setae distally (1 broken off). Article 3 with 1 small “tooth”; article 4 with 1 broom seta; terminal article with 1 aesthetasc and 2 slender setae terminally.</p> <p> <i>Antenna</i> (Fig. 7 C) about 1 mm long, length 0.8 times body length; with 6 peduncular and 9 flagellar articles. Article 5 with 2 broom setae and 2 simple setae. Article 6 with 1 large and 3 small broom setae and with 1 slender and 2 small setae distally. Flagellar articles 1–8 with 2 slender setae each; terminal article with 4 long slender setae distally.</p> <p> <i>Mandibles</i> (Fig. 7 E): left mandible was not dissected from the holotype. Palp articles 1 and 2 of right mandible without setae; apical article with 9 ventral setae, distal one longest. Incisor with 1 strong tooth. Lacinia mobilis with 3 small teeth; spine row with 5 spines. Molar with 10 slender setae.</p> <p> Inner lobe of <i>Maxillula</i> (Fig. 7 F) slightly smaller than outer lobe (lost during dissection). Outer lobe length 4.1 times width, dorsal margin with 6 pairs of fine setae, ventral margin with 6 small simple setae, terminally with 11 strong spines (4 of them with setules).</p> <p> Medial lobe of <i>Maxilla</i> (Fig. 7 G) shorter than outer lobes; without setae terminally, with 7 fine setae marginally. Outer lobe length 6.8 times width, with 3 setae terminally.</p> <p> Left and right <i>maxilliped</i> (Fig. 7 D) connected by 2 retinacula. Epipodite length 3.6 times width, length 1.1 times endite length. Endite with numerous fine setae marginally and terminally. Edge of endite and palpal articles 1 and 2 fringed with a row of fine setae and 1 seta on tip. Article 1 length 0.6 times width; article 2 length 1.1 times width; article 3 length 0.9 times width, inner margin with 5 setae, outer margin with 2 setae; article 4 length 1.3 times width, with 3 setae; article 5 length 2 times width, with 3 terminal setae.</p> <p> <i>Pereopod 1</i> (Fig. 8 A) basis length 3.8 times width; with 1 broom seta and 1 small seta marginally and with 1 simple seta distoventrally. Ischium length 2.5 times width; with 1 composed seta dorsally and 1 small seta ventrally. Merus length 1.5 times width; with 1 composed and 1 simple seta distodorsally and with 2 unequally bifid distally setulate setae and 1 comb of fine setules in cuticular membrane ventrally. Carpus length 4.4 times width; with 1 small seta distodorsally and with 3 unequally bifid distally setulate setae and 3 combs of fine setules inserted in cuticular membrane ventrally. Propodus length 2.9 times width; with 1 small seta distodorsally and with few small slender setae, fringed with fine setules inserted in cuticular membrane, ventrally. Dactylus length 4.2 times width; with 3 small slender setae medially; unguis with 1 robust cuspidate and 1 conate seta and with 2 slender setae in between.</p> <p> <i>Pereopod 2</i> (Fig. 8 B) similar to pereopods 3 and 4 (Fig. 8 C, 9A). Basis length 3.5 times width; with 1 small broom seta dorsally and 3 small setae ventrally. Ischium length 2.8 times width; with dorsal hook and 1 small seta ventrally. Merus length 1.2 times width; with 1 seta distodorsally (broken off) and 1 small seta distoventrally. Carpus length 4.4 times width; with 2 slender simple setae dorsally and with 5 robust unequally bifid setae and 6 combs of fine setules inserted in cuticular membrane ventrally. Propodus length 2.9 times width; with 1 small broom seta distodorsally and with 2 robust unequally bifid setae fringed with fine setules inserted in cuticular membrane ventrally. Dactylus length 4.2 times width; with 3 small slender setae medially; unguis with 1 conate seta dorsally and 2 slender setae ventrally.</p> <p> <i>Pereopod 5</i> (Fig. 9 B) similar to pereopods 6 and 7 (Fig. 9 C–D). Basis length 5.3 times width; with 3 broom setae dorsally, with 2 small seta ventrally. Ischium length 3.5 times width; with 1 dorsal hook. Merus length 2 times width; with 2 robust setae distodorsally and with 1 small seta distoventrally. Carpus length 5.6 times width; with 1 small broom seta and 1 small seta distodorsally and with 2 long slender setae and 3 combs of fine setules inserted in cuticular membrane ventrally. Propodus length 5.1 times width; with 1 small broom seta and 1 long slender seta distodorsally and with 4 slender setae of varying size and 1 comb of fine setules inserted in cuticular membrane ventrally. Dactylus length 5 times width; unguis with 1 long conate seta dorsally and 2 slender setae ventrally.</p> <p> <i>Pleopod 2</i> (operculum, Fig. 8 D) length 1.1 times width; margins rounded, with 4 slender setae on distal margin.</p> <p> Endopod of <i>pleopod 3</i> (Fig. 8 E) length 1.2 times width; with 3 long plumose setae distally. Exopod length 0.6 times endopod length; inner margin hirsute, with 1 small seta distally.</p> <p> Endopod of <i>Pleopod 4</i> (Fig. 8 F) oval-shaped, length 2.3 times width. Exopod length 3.9 times width; outer margin with row of fine setae, with 1 long plumose seta distally.</p> <p> <i>Uropods</i> (Fig. 8 G) uniramous, bulbous, not overlapping posterior margin of pleotelson, overlapping anus valves. Endopod length 1.5 times protopod length, 1.9 times longer than wide; with 3 broom setae, 5 slender simple setae of varying size terminally. Protopod length 1.5 times width, with 3 slender setae.</p> <p> <b>Type locality.</b> Australian continental slope, South Pacific.</p> <p> <b>Distribution.</b> Only known from type locality.</p> <p> <b>Etymology.</b> The name <i>satanus</i> (masculine) refers to the devil-like cephalic spines at the cephalothorax of the new species.</p> <p> <b>Remarks.</b> <i>Pseudomesus satanus</i> sp. nov. is assigned to the genus <i>Pseudomesus</i> due to the elongated body (more than 6 times pereonite 2 width), the enlarged dorsally inflated pleotelson, the extremely short uropods and the characters of the pereopod 1. This new species is most similar to <i>P. p i t o m b o</i> sp. nov., but can be distinguished from the latter by the following characters: cephalothorax width 1.5 times length, anterior margin medially vaulted, with two cephalic spines and a row of small setae on frons; article 4 of antennula with 1 long broom seta; antenna with 9 flagellar articles; exopodit of maxilliped reaching fourth palpal article. Both species can be distinguished from the remaining species of the genus by the presence of a well developed mandibular palp.</p>Published as part of <i>Kaiser, Stefanie & Brix, Saskia, 2007, Two new species of the genus Pseudomesus Hansen, 1916 (Isopoda, Asellota) from the Southern hemisphere: Pseudomesus pitombo sp. nov. and Pseudomesus satanus sp. nov., pp. 21-38 in Zootaxa 1658</i> on pages 33-37, DOI: <a href="http://zenodo.org/record/274018">10.5281/zenodo.274018</a>
Macrostylis cerritus Vey & Brix, 2009, sp. nov.
No full textMacrostylis cerritus sp. nov. (Figures 1 –7) Holotype: Female preparatory, length 1.8 mm, ZMH K-41431, station 78-9- E, Brenke sledge, depth 2149 m, RV Polarstern. Paratypes: 1 subadult male, length 1.9 mm, not drawn for description, ZMH K-41432, allotype, same sample data as holotype; 3 females, ZMH K-41433: 1 preparatory, length 2.8 mm, 2 unknown, lengths 2.3 mm, 2.0 mm, same sample data as holotype; 9 females, ZMH K-41434: 3 adult brooding, lengths 2.2 mm, 2.3 mm, 2.0 mm, 4 preparatory, lengths 1.6 mm, 1.7 mm, 1.8 mm, 1.7 mm, 2 unknown, lengths 2.0 mm, 2.4 mm, same sample data as holotype. Type locality: ANDEEP III, station 78-9- E (71°09.52'S, 14°00.76'W). Distribution. Known only from type locality. Etymology. “cerritus”, Latin, meaning “crazy”, referring to the appearance of the species. During description we were talking about labelling the species as such because the ventral spines and dorsally oriented pereopod 3 with hook-like ischium make the species look like a “crazy little thing”. Diagnosis. Body elongate, at least 4 times as long as broad. Head broader than long, not fused to first pereonite. Antennula short, of 5 articles, with one thick distal aesthetasc. Antenna with broom setae present only on article 5. Mandibles truncated and robust, incisor with 4 cusps, molar with many setulose setae at apex. Mandible with long robust seta laterally. Maxilliped palp with 5 articles and many short setae. Ventral spines present on pereonites 1, 6 and 7. Pereopod 3 with long, thin, curved ischium lobe. Pereopod 4 greatly reduced in size, juvenile looking. Operculum with strong spine-like unequally bifid setae ventrally. Pleopod 5 absent. Description. Body approximately 3.1 mm long, almost 5 times as long as wide, body dorsum and margins smooth, without setae. Head almost as long as wide, almost as wide as pereonite 1, without eyes. Coxae not visible in dorsal view. Pereonites 1–3 strongly fused, with 1 and 2 shortest, 3 widest. Pereonites 5–7 with posteriorly directed small spines inserting apically. Distinct anterior-oriented spine on pereonite 1 ventrum, posterior-oriented spines on pereonite 6 and 7 ventrum. Pleotelson 0.24 times body length, 0.8 times body width, 1.4 times longer than wide, slightly shorter than pereonites 5–7 together. Anterior and posterior dorsal margins rounded. Antennula (Figure 2D) short, approximately 0.1 times body length, with 5 articles. Article 1 longest and widest, length 0.07 mm, width 0.04 mm, with 3 simple setae and 1 broom seta. Article 2 length 0.6 times article 1 length, width 0.8 times article 1 width, with 3 broom setae. Article 3 length 0.5 times article 1 length, width 0.6 times article 1 width, without setae. Article 4 length 0.25 times article 1 length, width 0.45 times article 1 width, distally with 1 simple seta. Article 5 minute, terminally with 1 aesthetasc. Antenna (Figure 2C) approximately 0.3 times body length, with 12 articles. Articles 1–3 small, article 1 with lateral simple seta, article 2 without setae, article 3 with 2 slender setae. Article 4 longest, slightly longer than article 5, without setae. Article 5 long and slender, distally with 5 broom setae and 2 whip (as in Brandt 1992) setae. Distal 7 flagellar articles small, of subequal length, eighth, ninth and eleventh article each with 1 slender seta, terminal article with distal sensory setae. Mandibles (Figure 3A, 3B, 6A) without palp, palp replaced with robust seta (missing on left mandible), both with 4 cusps on incisor. Right setal row with 5 robust setulose setae and 2 attenuating simple setae, left setal row with 5 robust setulose, 1 setulose simple attenuating seta and 1 simple attenuating seta. Lacinia mobilis of left mandible with 3 teeth, right with 2. Molar a distinct process, with a dense row of 9 setulose slender setae. Maxillula (Figure 2B) mesial lobe stalked, with 12 setae, and slightly smaller than lateral lobe. Lateral lobe length 2.2 times width, dorsal margin with 12 setae, ventral margin with 8 setae, terminally with 11 strong spines (3 of which serrated). Maxilla (Figure 2A) mesial lobe shorter than middle and lateral lobes. Mesial and lateral lobes distally with 2 long and 1 setulose setae, and a number of setae pairs laterally. Lateral lobe length 6.9 times width. Mesial lobe length 4.7 times width, distally with 3 large and 3 small robust setae. Laterally with 12 long slender setae. Maxilliped (Figure 2E, 6B) epipodite length 2.7 times width, length 0.8 times endite length. Endite with 2 retinaculae, 1 lateral simple seta, distally with 3 fan setae, 8 simple setae and many marginal fine setae. Palp inserted at approximately two thirds the basis length, width 0.6 times length and palp length about 0.5 times basis length; palp article 1 with some marginal fine setae; palp article 2 about 5 times as long as article 1, almost twice as wide as article 1, with 4 medial and 1 distolateral setae; article 3 approximately a third the length of article 2, with 6 setae; article 4 less than half the width of article 3 width, with 3 distal setae; article 5 narrower than article 4, with 5 setae. Pereopod 1 (Figure 3C) basis length 2.9 times width, dorsally with 4 short setae, ventrally with 1 short slender and 1 long slender setae. Ischium length 2.4 times width, dorsally with 2 long slender setae, ventrally with 1 robust simple seta, laterally with 3 long slender setae. Merus length 1.8 times width, dorsally with 1 distally setulate seta, ventrally with 2 robust setae, laterally with 4 long slender setae. Carpus length 1.4 times width, ventrally with 1 distally setulate and 1 robust setae, laterally with 1 robust simple and 1 short robust simple setae, distally with 1 long robust seta. Propodus length 3 times width, dorsally with 1 slender seta, ventrally with 3 short simple setae. Dactylus length 4.4 times width, claw composed of 1 conate and 1 cuspidate setae with 2 slender setae inserting in between, 2 slender setae inserting terminally into conate setae. Pereopod 2 (Figure 3D) basis length 3.1 times width, dorsally with 4 simple setae, ventrally with 3 simple and 1 long slender setae. Ischium length 2.9 times width, dorsally with 2 simple setae, ventrally with 1 minute seta, laterally with a composed row of 5 long slender setae. Merus length 1.6 times width, dorsally with 1 robust unequally bifid seta, ventrally with 2 unequally bifid and 1 simple setae, laterally with a (composed) row of 5 long slender setae. Carpus length 2.4 times width, dorsally with 2 long simple, 1 small broom and 1 long simple setae, ventrally with 2 unequally bifid setae. Propodus length 3.1 times width, dorsally with 1 unequally bifid and 1 broom setae, ventrally with 1 simple seta. Dactylus length 3.7 times width, claw composed of 1 conate and 1 cuspidate setae with 2 slender setae inserting in between, 2 slender setae inserting into conate seta. Pereopod 3 (Figure 3E) basis length 2.4 times width, dorsally with 1 simple seta, ventrally with 3 simple slender and 1 unequally bifid setae. Ischium length 2.3 times width, dorsally with large hook-shaped triangular lobe, 1 short slender and 4 long slender setae. Merus length 1.4 times width, dorsally with a row of 4 long simple setae and a row of 4 robust unequally bifid setae, ventrally with 1 small simple seta. Carpus length 2.8 times width, dorsally with a row of 5 long simple setae. Propodus length 2.5 times width, dorsally with 1 small simple seta, ventrally with 1 simple seta, distally with 1 simple seta. Dactylus length 1.1 times width, claw composed of 1 conate and 1 cuspidate setae with 2 slender setae inserting in between, 1 terminal slender seta and 1 simple seta inserting ventrally into conate seta. Pereopod 4 (Figure 4A) short, only half the length of pereopod 3. Basis length 3.4 times width, dorsally with 1 broom seta, ventrally with 1 broom and 3 slender simple setae. Ischium length 2.8 times width, dorsally with 1 slender simple and 1 simple setae. Merus length 1.7 times width, ventrally with 2 distal simple robust setae, distally with 1 simple robust and 1 long simple robust setae. Carpus length 2.3 times width, ventrally with 2 robust setae, distally with 1 long and 1 short robust setae. Propodus length 2.3 times width, distally with 1 short robust and 1 long robust setae. Dactylus very compressed with one terminal robust seta. Pereopod 5 (Figure 4B) basis length 2.9 times width, dorsally with 2 long simple robust (1 broken) setae, ventrally with 2 small broom, 1 simple slender and 1 large broom setae, distally with 1 robust simple seta. Ischium length 3.3 times width, dorsally with 1 unequally bifid seta, ventrally with 2 simple and 1 long slender setae, distally with 2 long slender setae. Merus length 2.4 times width, ventrally with 2 sets of an unequally bifid and simple setae, distally with 4 unequally bifid setae. Carpus length 4.5 times width, dorsally with 1 broom seta, ventrally with 1 unequally bifid seta, distally with 3 short unequally bifid and 1 long unequally bifid setae. Propodus length 5.1 times width, dorsally with 1 simple and 1 broom setae, ventrally with 1 unequally bifid seta, distally with 1 unequally bifid and 1 long slender setae. Dactylus length 3.5 times width, terminally with 2 unequally bifid setae with setulose smaller lobes. Pereopod 6 (Figure 4C) basis length 2.7 times width, dorsally with 1 unequally bifid, 1 simple and 3 slender setae, ventrally with 3 slender setae, distally with 1 robust seta. Ischium length 2.7 times width, dorsally with 2 simple and 1 unequally bifid setae, ventrally with 5 slender setae. Merus length 2 times width, ventrally with 1 simple seta, dorsally with 5 short, 2 long unequally bifid and 1 simple setae. Carpus length 6 times width, dorsally with 1 broom seta, ventrally with 1 simple seta, distally with 1 unequally bifid and 1 long setae. Propodus length 8 times width, distally with 1 long slender, 1 unequally bifid and 1 broom setae. Dactylus length 5.8 times width, distally with 1 open-ended sensory seta and 1 unequally bifid seta. Pereopod 7 (Figure 4D) basis length 3 times width, dorsally with 10 long distally slender plumose setae, 6 slender setae (1 broken), 1 short simple seta and 1 unequally bifid seta, ventrally with 4 slender setae. Ischium length 3.4 times width, dorsally with 2 distally setulate and 1 unequally bifid setae, ventrally with 1 distally setulate and 1 distal simple setae. Merus length 2.4 times width, ventrally with 1 simple seta, distally with 4 unequally bifid and 1 robust unequally bifid setae. Carpus length 6.3 times width, ventrally with 1 simple seta, distally with 2 unequally bifid, 2 simple and 1 short robust setae. Propodus length 8.8 times width, dorsally with 1 broom seta, ventrally with 2 slender setae, distally with 2 long distally setulate setae. Dactylus length 4.7 times width, terminally with 1 long distally setulose and 1 long unequally bifid setae. Operculum (Figure 5B) length 1.5 times width. Ovoid, tapering towards posterior, broadest medially, narrower towards anterior. Mediolaterally with 11 slender setae on both sides. Ventrally with 5 robust setae inserting towards both the left and right margins. One distally setulose unequally bifid seta inserting towards posterior near the mediocentral line. Caudally with a row of 18 long and slender plumose setae. Pleopod 3 (Figure 5C) endopod length 1.5 times width, distally with 3 plumose setae. Exopod length 6.2 times endopod length, reaching almost as far as endopod, laterally with many slender setae, of which the anterior half are long and insert into a groove, distally with 9 setae. Pleopod 4 (Figure 5D) endopod quadrangular, length 1.6 times width, distally with 1 minute seta. Exopod length 5.5 times width, outer margin with row of 20 slender setae, distally with 1 plumose seta, exceeding length of endopod. Pleopod 5 absent Uropods (Figure 5A) uniramous, sympod 4 times ramus length, 17 times longer than wide, with 9 broom setae of varying lengths. Ramus 5 times longer than wide, distally with 2 broom setae and 1 (broken) seta.Published as part of Vey, Aidan & Brix, Saskia, 2009, Macrostylis cerritus sp. nov., a new species of Macrostylidae (Isopoda: Asellota) from the Weddell Sea, Southern Ocean *, pp. 356-370 in Zootaxa 2096 (1) on pages 358-367, DOI: 10.11646/zootaxa.2096.1.21, http://zenodo.org/record/532260
Pseudomesus pitombo Kaiser & Brix, 2007, sp. nov.
No full text<i>Pseudomesus pitombo</i> sp. nov. <p>(Figs 1–6)</p> <p> <b>Material examined.</b> Holotype: 1 ɗ (adult, 1.5 mm), Angola Basin, 16°18.1`S, 005°27.2`E – 16°19.3`S, 005°527.2`E, RV <i>Meteor</i> (48/1), station 348, 5390– 5387 m, ZMH K–41066.</p> <p> Paratypes: 1 Ψ (preparatory, 3.4 mm), Angola Basin, 18°18.3`S, 004°41.3`E – 18°19.4`S, 004°41.9`E, RV <i>Meteor</i> (48/1), station 340, 5395 m, ZMH K–41067. 1 Ψ (juvenile, 1.8 mm), Angola Basin, 17°06.2`S, 004°41.7`E – 17°07.5`S, 004°42.3`E, RV <i>Meteor</i> (48/1), Station 344, 5415 m, ZMH K–41068.</p> <p> <b>Diagnosis.</b> <i>Mandible</i> with palp; carpus and propodus of <i>pereopods 2–4</i> long and slender (length> 6.5 width); <i>coxa</i> 1 in female strongly produced, visible in dorsal view.</p> <p> <b>Description.</b> <i>Habitus</i> of male holotype (Fig. 1 A–B): <i>Body</i> approximately 1.5 mm long (measured without appendages), length 6.9 times pereonite 2 width. Surface alveolar structured, with few simple setae. <i>Pereonites</i> 1–4 increasing in length caudally; pereonite 2 widest, width 2.2 times length, about 1.2 times pereonite 1 width. Pereonite 1 about 3.5 times wider than long, 0.6 times pereonite 2 length; pereonite 3 almost twice as long as wide, width 0.8 times pereonite 2 width; pereonite 4 width times 1.5 length, lateral margin convex. <i>Pereonites 5–7</i> decreasing in length caudally. Pereonite 5 longest, length 3.5 times pereonite 1 length, as long as wide, width increasing caudally like in pereonites 6–7; anterior margin slightly concave, lateral margin straight. Pereonite 6 as wide as pereonite 2, lateral margins of pereonites 6–7 straight. Coxae 1–7 visible in dorsal view; coxa 1 tipped with a robust spine, coxae 2–4 each with slender seta. <i>Pleotelson</i> (Fig. 1 C) 0.2 times body length, 1.3 times wider than long, almost as wide as pereonite 2; anterior margin straight, posteriorly strongly bended, with two posterolateral spines, 0.7 from anterior margin, acute-angled, caudally bended. Anus laterally and caudally covered by anus valves. <i>Uropods</i> inserting closely to anus valves, covering them partially.</p> <p> <i>Cephalothorax</i> (Fig. 1 D) 1.3 times longer than wide, triangular, mediofrontally vaulted, posterior margin strongly convex.</p> <p> <i>Antennula</i> like in female.</p> <p> <i>Antenna</i> (Fig.1 E) robust, about 0.6 mm long; length 0.4 times body length, with six peduncular and 17 flagellar articles. Peduncular articles 1–4 short, articles 1, 2 and 4 of similar size, almost rectangular, article 3 length 1.7 times article 4 length, with 1 simple seta; article 5 length 2.4 times width, with 1 small seta distally; article 6 somewhat shorter than article 5, as long as article 1–4 together, length 2.3 times width, with 1 long and 2 short broom setae and 3 simple slender setae of varying size distally. Flagellar articles 1–17 decreasing in width and length distally; article 1 length 2.4 times article 2 length, as long as wide. Articles 1–10 with row of long, simple setae; some articles with 1–3 fine simple setae; article 17 with 5 long and 4 short slender setae terminally.</p> <p> <i>Pereopod 1</i> (Fig.1 A) more robust than pereopods 2–7; basis length 5.8 times width; with 1 small seta ventrally. Ischium 0.6 times basis length, 3.2 times longer than wide; with 1 small seta distodorsally. Merus about half of ischium length, 1.4 times longer than wide; with 2 setae of different size dorsally, with a ventral hook.</p> <p>Carpus length 3 times merus length, 4.4 times longer than wide; with row of fine hairs inserted in cuticular membrane and 3 robust unequally bifid setae ventrally. Propodus length 1.1 times carpus length, about 4 times longer than wide; with 1 simple seta distodorsally and a row of fine hairs inserted in cuticular membrane ventrally, with 2 short simple setae distally. Dactylus length 0.6 times propodus length, 5.3 times longer than wide; with 3 simple setae medially; unguis with 1 short robust cuspidate seta dorsally and 2 slender setae of same length ventrally.</p> <p> <i>Pereopods 2–4</i> (Fig. 2 B–D): basis of pereopods 2 and 3 missing; pereopod 4 basis length 6.8 times width; with 1 broom seta dorsally. Ischium of pereopods 2–4 length 4.3 times width; with 1 slender seta distodorsally, pereopod 4 with a proximal hook. Merus length 1.8 times width; with 1 long slender seta dorsally, pereopod 2 additionally with 1 short seta distally, pereopods 2–3 with 1 small, simple seta ventrally. Pereopods 2– 3 carpus length 6.5 times width, pereopod 4 carpus length 8.8 times width; pereopods 2–4 with 3–4 slender simple setae dorsally, decreasing in length distally, with row of fine hairs inserted in cuticular membrane ventrally, with 3–6 robust unequally bifid setae increasing in length distally. Propodus length about 6.8 times width; with 1–3 short simple setae dorsally, pereopods 2 and 3 with row of fine setules inserted in cuticular membrane and 2–3 short robust unequally bifid setae ventrally. Dactylus of pereopods 2–3 length 6 times width, of pereopod 4 length 5 times width; pereopod 2 and 4 with 2–4 small setae medially; claw of pereopods 2–4 length 0.3 times dactylus length, with 2 short cuspidate setae and 2 slender simple setae in between.</p> <p> <i>Pereopods 5–7</i> (Fig. 2 E–G) more slender than pereopods 1–4; basis of pereopod 6 missing, of pereopod 5 damaged proximally. Pereopod 7 basis length 7.1 times width, pereopod 5 and 7 with 1 slender simple seta and 2 broom setae dorsally, and with 1 short simple seta and 1 broom seta ventrally. Ischium of pereopod 5–7 length 4.3 times width; with 1 slightly produced hook dorsally and with 1 fine simple seta ventrally. Merus length twice width; with 1–2 dorsal and 1 ventral fine simple seta. Carpus length 7 times width; carpus and propodus with row of long and slender natatory setae; with 11 natatory setae on carpus and propodus; ventral row reduced; carpus of pereopod 6 with 4 long natatory setae ventrally, pereopods 5–7 additionally with 2 robust, composed setae and 1–2 slender simple setae ventrally. Propodus length 8.6 times width; with 5–6 long slender natatory setae ventrally and 3 somewhat shorter simple setae distally. Dactylus length 7 times width; unguis of pereopod 7 with 1 robust cuspidate seta dorsally and 1 slender somewhat longer seta ventrally.</p> <p> <i>Pleopod 1</i> (Fig. 1 F) long, proximally slender, width increasing distally. Lateral margins slightly concave with 1 fine seta; distal margin slightly concave, with some fine setae.</p> <p> Protopodit of <i>pleopod 2</i> (Fig. 1 G) length 2.6 times width; with 4 slender, simple setae distolaterally. Endopodite inserting 0.3 of distal tip; stylet length 0.8 times protopodite length, distal part slender, width 0.2 times proximal part width. Exopodite small, without setation.</p> <p> <i>Uropods</i> (Fig. 1 C) like in female.</p> <p> <b>Descriptive notes on males.</b> <i>Habitus</i> (Fig. 1 A–B) more slender than in female, coxae 1–5 more produced, coxae 1–7 visible in dorsal view. <i>Pereonites</i> 2 and 6 widest; <i>pleotelson</i> with 2 posterolateral spines. <i>Cephalothorax</i> longer than wide, anterior margin mediofrontally vaulted. <i>Antenna</i> (Fig. 1 E) more robust, flagellum setose, with 17 flagellar articles. <i>Pereopods 5–7</i> (Fig. 2 E–G) with long natatory setae on dorsal margin of carpus and propodus; ventral row reduced.</p> <p> <b>Description of paratype female.</b> <i>Habitus</i> (Fig. 3 A, C): <i>Body</i> 3.4 mm long, 5.3 times longer than width of pereonite 1; surface with few single setae. All <i>pereonites</i> free, dorsoventrally not considerably flattened; pereonites 1–4 decreasing in width and increasing in length caudally; pereonite 1 width 4.6 times length; pereonite 2 width 2.5 times length, pereonite 3 twice as long as wide; pereonite 4 width 1.6 times length. Pereonites 5–7 of same width, decreasing in length caudally; pereonite 5 longest, length 3.1 times pereonite 1 length, almost as long as wide, increasing in width caudally. Coxae 1 and 5–7 visible in dorsal view; coxa 1 tipped with 1 fine seta. <i>Pleotelson</i> (Fig. 6 H) length 0.2 times body length; 1.4 times longer than wide; width 0.8 times pereonite 1 width; anterior margin straight, posterior margin strongly bended. Anus laterally covered by anus valves; uropods inserting closely to the anus valves, covering them partially.</p> <p> <i>Cephalothorax</i> (Fig. 3 A, C) free, oval shaped; length 1.2 times width, about 0.2 times body length. Anterior margin almost straight, posterior margin strongly convex.</p> <p> <i>Antennula</i> (Fig. 4 C) 0.3 mm long; length 0.1 times body length, with 5 articles. Article 1 short, with 1 short broom seta and 1 seta broken off; article 2 length 1.6 times article 1 length, with 1 long broom seta distally. Article 3 length 0.3 times article 2 length. Article 4 length 0.25 times article 2 length, with 2 small simple setae. Terminal article minute; length 0.2 times article 2 length, with 3 long slender setae and 1 aesthetasc.</p> <p> <i>Antenna</i> (Figs 3 B, 4A) about 1.4 mm long, length 0.4 times body length, with 6 peduncular and 10 flagellar articles. Peduncular articles 1–4 short, articles 1, 2 and 4 of similar size; article 3 length twice article 4 length, with 1 small seta; articles 1–4 together as long as article 5. Article 5 length 4 times width, with 2 short setae distally. Article 6 length 1.3 times article 5 length, 6 times width, with 2 broom setae and 3 simple setae of varying size distally. Length of flagellar articles 1–10 decreasing distally; articles 1–9 with up to 4 fine setae distally, article 10 with 5 long slender setae terminally.</p> <p> Palp of left and right <i>mandible</i> (Fig. 4 D–E) not reaching tip of incisor. Articles 1 and 2 of same length, article 2 of right mandible with 1 slender seta; article 3 length 0.25 times article 2 length, with few short setules. Incisor of right and left mandible with 2 teeth. Lacinia mobilis of left mandible with 3 teeth; setal row with 17 slender setae, of right mandible with 13 slender setae. Molar of left mandible almost as long as palp, with 16 slender simple setae, of right mandible with 14 slender simple setae.</p> <p> <i>Maxillula</i> lost during dissection.</p> <p> Outer margin of <i>maxilla</i> (Fig. 4 F) outer and inner lobe with some slender setae of varying size. Outer and medial lobe with 2–3 robust long setae, distal margin of inner lobe with several fine setae, surface of medial and inner lobe with few fine setae.</p> <p> Right and left <i>maxilliped</i> (Fig. 4 G) connected by 2 retinacula. Epipodite triangular, surface smooth, length 3.2 times width, almost reaching palpal article 3. Palpal article 1 length almost half of article 2 length; article 2 almost as long as wide, with several slender setae, decreasing in length distally; article 3 somewhat shorter than article 2, somewhat wider than long, with 6 slender setae; article 4 length 0.7 times article 3 length, half as long as wide, with 4 slender simple setae; article 5 half of article 4 width, terminally with 5 fine setae. Endite with several slender setae laterally and distally. Protopodite oval, width 1.5 times length.</p> <p> <i>Pereopod 1</i> (Fig. 5 A) more robust than pereopods 2–7; basis lost during dissection. Ischium length 3 times width; with 1 robust seta distodorsally, length twice merus length. Merus length 1.2 times width; with 1 robust and 1 more slender seta dorsally, with a row of fine setules inserted in cuticular membrane and 2 robust unequally bifid setae ventrally; merus half of carpus length. Carpus length 3.2 times width; with 1 short seta distodorsally, with a row of fine setules inserted in cuticular membrane and 3 robust unequally bifid setae ventrally increasing in length distally; carpus length 1.3 propodus length. Propodus length 3.3 times width; with 1 short slender seta distodorsally, ventral margin with row of fine hairs inserted in cuticular membrane and 2 simple setae or varying size distally. Dactylus as long as propodus, length 5 times width; with 3 fine, simple setae medially; unguis length 0.4 times dactylus length; with 2 robust cuspidate setae and 2 slender setae in between.</p> <p> <i>Pereopods 2–4</i> (Fig. 5 E): pereopods 2 and 3 missing in adult female, described from juvenile. Pereopod 4 basis length 7.3 times width; with few short simple setae and strongly produced dorsal hook proximally; basis length 1.5 ischium length. Ischium length 6.3 times width; with 1 short dorsal and ventral seta and 1 dorsal hook; length twice as long as merus. Merus length twice width; with 1 slender seta on dorsal and ventral margin; merus length 0.4 times carpus length. Carpus length 5.2 times width; with 1 slender simple seta distodorsally, with row of fine setules inserted in cuticular membrane and 2 robust unequally bifid setae ventrally; carpus length 1.6 times propodus length. Propodus length 4.2 times width; with 1 long slender seta distodorsally, with row of fine hairs inserted in cuticular membrane and 3 short unequally bifid setae ventrally. Dactylus length half of propodus length, 5.5 times width, with 2 fine short setae medially; unguis length almost half of dactylus length; with 2 robust cuspidate setae, ventral one somewhat shorter than dorsal seta, with 1 slender seta in between.</p> <p> <i>Pereopods 5–7</i> (Fig. 6 A, C): pereopod 6 missing (drawn from juvenile). Pereopod 5 basis length 5 times width, in pereopod 7 length 6.5 times width; pereopod 5 with a distinct ventral hook, pereopod 7 with 1 broom seta medially and 1 short simple seta ventrally. Pereopod 5 ischium length 6.1 times width; with 1 ventral broom seta and few small simple setae; pereopod 7 ischium length 4.4 times width. Pereopod 5 and 7 merus length 1.8 times width; with 1–2 small simple setae on ventral and dorsal margin. Pereopod 5 carpus length 7.1 times width, in pereopod 7 length 5.1 times width; pereopod 5 with 2 short simple setae distodorsally, with 3 simple setae increasing in length distoventrally; pereopod 7 with 2 small simple setae distodorsally and with 1 long slender seta distoventrally. Pereopods 5 and 7 propodus with 1–2 slender setae of varying size dorsally and with 3 slender simple setae ventrally. Pereopod 5 dactylus length 8.3 times width, in pereopod 7 length 6.5 times width. Pereopods 5 and 7 unguis length half of dactylus length; pereopod 5 with 2 long slender setae dorsally and 1 somewhat shorter seta ventrally; pereopod 7 with 1 robust cuspidate seta dorsally and 2 slender, somewhat shorter setae ventrally.</p> <p> <i>Pleopod 2</i> (operculum, Fig. 6 D) as long as wide; surface smooth; with 4 short simple setae distally. Lateral margins strongly curved, more straight distally.</p> <p> <i>Pleopods 3–5</i> (Fig. 6 F–G): Pleopod 4 lost during dissection. Exopodite of pleopod 3 small, triangular, with few fine setae on inner margin; endopodite length 3 times exopodite length, 1.5 times width, distally with 3 short plumose setae. Pleopod 5 oval-shaped, without setation; protopodite length 1.6 width, endopodite length 3.2 protopodite length, 1.6 endopodite width.</p> <p> <i>Uropods</i> (Fig. 6 E) uniramous, small. Length 0.2 times pleotelson length, not overlapping pleotelson´s posterior margin. Protopodite length 1.6 times endopodite length, with 5 slender setae. Endopodite length 1.5 times width, terminally with 1 long, slender seta and 1 somewhat shorter broom seta.</p> <p> <b>Descriptive notes on juvenile paratype.</b> <i>Habitus</i> (Fig. 3 D–E): pereonite 7 incompletely developed; pereopod 7 missing. Only coxae 5 and 6 visible in dorsal view. Pleotelson length 0.25 times body length. <i>Cephalothorax</i> length 0.2 times body length.</p> <p> <i>Antennula</i> (Fig. 4 B) article 2 with 2 broom setae. <i>Antenna</i> (Fig. 3 D–E) with 9 flagellar articles.</p> <p> <i>Pereopods 1–3</i> (Fig. 5 B–D): Pereopod 1 carpus with only 1 unequally bifid seta ventrally, setal row and unequally bifid setae absent on ventral margin of merus. <i>Pereopods 2–3:</i> basis of pereopod 3 damaged. Pereopod 2 basis length 3.4 times width, with 4 short setae ventrally, length 1.3 times ischium length. Pereopods 2 and 3 ischium length about 3.6 times width. Merus length twice ischium length; with 1 long, slender seta distodorsally and 1 short simple seta distoventrally. Carpus length 2.6 times merus length; pereopod 2 carpus length 4.4 times width, in pereopod 3 about 5.3 times width, pereopod 2 and 3 with row of fine setules inserted in cuticular membrane and 1 robust unequally bifid seta ventrally; carpus length 1.6 propodus length. Propodus length 3.6 times width, with 1–2 slender setae distodorsally; row of fine setules inserted in cuticular membrane and 2 robust unequally bifid setae ventrally; pereopod 2 additionally with 1 slender simple seta medioventrally; propodus length 1.3 times dactylus length. Pereopod 2 dactylus length 4.7 times width; pereopod 3 dactylus more slender, length 6 times width; pereopods 2 and 3 with 2–3 fine setae medially. Pereopod 2 unguis length 0.2 times width, with 2 cuspidate setae and 2 somewhat longer slender setae in between; pereopod 3 unguis length almost half of dactylus length, with 2 cuspidate setae and 2 slender setae in between.</p> <p> <i>Pereopod 6</i> (Fig. 6 B) more slender than pereopod 2 and 3; basis damaged proximally, with 1 short broom seta ventrally. Ischium length 3.6 times width, 1.6 of merus length. Merus length 2.3 times width, with 1 short simple seta distodorsally and distoventrally; merus half of carpus length. Carpus length 5.7 times width, with 1 short simple seta distodorsally and 1 long more robust seta distoventrally; carpus length 1.4 times propodus length. Propodus length 4 times width, with 2 slender simple setae of varying size dorsally and ventrally; propodus length 1.2 times dactylus length. Dactylus 6.7 times width; unguis about half of dactylus length, with 1 robust cuspidate seta dorsally and 2 slender setae ventrally.</p> <p> <b>Type locality.</b> South-eastern Atlantic Ocean, Angola Basin.</p> <p> <b>Distribution.</b> Only known from type locality.</p> <p> <b>Etymology.</b> <i>Pitombo</i> comes from a Bantu dialect spoken in Angola and means “bulge at head”. The name refers to the shape of the male cephalothorax.</p> <p> <b>Remarks.</b> <i>Pseudomesus pitombo</i> sp. nov. is assigned to the genus <i>Pseudomesus</i> Hansen, 1916 by means of the following synapomorphies: antennula with 5 articles, terminal article minute; pleotelson enlarged, uropods uniramous, endopodite short; pereopod 1 shorter and more robust than pereopod 2; sexual dimorphism strongly developed.</p> <p> The new species mostly resembles the male of <i>Pseudomesus brevicornis</i> Hansen, 1916 (redescribed by Svavarsson, 1984). Besides the lack of the mandibular palp, <i>P. brevicornis</i> can be distinguished from the new species as follows: Pereopod 5 with 15 (18) natatory setae on dorsal margin of carpus (propodus); carpus and propodus of pereopods 2 and 5 more robust.</p> <p> As there were only three specimens of <i>P. p i t o m b o</i> sp. nov. in the samples, and the preparatory female is considerably damaged, the male is designated as the holotype of this new species.</p>Published as part of <i>Kaiser, Stefanie & Brix, Saskia, 2007, Two new species of the genus Pseudomesus Hansen, 1916 (Isopoda, Asellota) from the Southern hemisphere: Pseudomesus pitombo sp. nov. and Pseudomesus satanus sp. nov., pp. 21-38 in Zootaxa 1658</i> on pages 23-33, DOI: <a href="http://zenodo.org/record/274018">10.5281/zenodo.274018</a>
Pseudomesus Hansen 1916
No full textPseudomesus Hansen, 1916 Pseudomesus: Hansen, 1916: 72; Birstein, 1963: 65; Chardy, 1974: 412; Svavarsson, 1984: 44. Type species: Pseudomesus brevicornis Hansen, 1916 Diagnosis. Body elongated (more than 5.5 times longer than width of pereonite 2). Pereonites 5–7 of nearly same size. Ischium of posterior pereopods dorsally with anteriorly directed cuticular hook. Carpus of pereopod 1 ventrally with minimum number of three composed setae standing in row. Pleotelson enlarged, dorsally inflated. Uropods uniramous, not extending beyond posterior margin of pleotelson, inserting closely to anus valves; endopod extremely short and nearly bulbous. Sexual dimorphism strongly developed (male: bilateral bulges on the cephalothorax; robust, setose antenna; pleotelson with posterolateral spines; pereopods 5–7 with long natatory setae) (modified after Hansen, 1916; Svavarsson, 1984; Wägele, 1989). Species composition (Table 1). Pseudomesus bispinosus Chardy, 1974; Pseudomesus brevicornis Hansen, 1916; Pseudomesus pitombo sp. nov.; Pseudomesus satanus sp. nov.; Pseudomesus similis Birstein, 1963.Published as part of Kaiser, Stefanie & Brix, Saskia, 2007, Two new species of the genus Pseudomesus Hansen, 1916 (Isopoda, Asellota) from the Southern hemisphere: Pseudomesus pitombo sp. nov. and Pseudomesus satanus sp. nov., pp. 21-38 in Zootaxa 1658 on page 23, DOI: 10.5281/zenodo.27401
Macrostylis G. O. Sars 1864
No full textKey to the Southern Ocean species of Macrostylis 1 Pleotelson rounded laterally.......................................................................................................................................... 4 - Pleotelson not rounded laterally................................................................................................................................... 2 2 Pleotelson laterally straight, with plumose setae................................................................................. M. hirsuticaudis - Pleotelson not laterally straight, without plumose setae............................................................................................... 3 3 Cephalon quadrate, pleotelson with lateral indentation............................................................................ M. bifurcatus - Cephalon triangular, pleotelson slightly produced.................................................................................... M. spiniceps 4 Pereonites 5–7 and pleotelson dorsally setulose.......................................................................................... M. setulosa - Pereonites 5–7 and pleotelson not dorsally setulose..................................................................................................... 5 5 Pereonite 7 and pleotelson with dorsal spine-like setae................................................................................... M. sarsi - Pereonite 7 and pleotelson without dorsal spine-like setae.......................................................................................... 6 6 Pereonites 1–7 subequal, 5–7 with postero-lateral spines.............................................................. M. cerritus sp. nov. - Anterior pereonites wider than posterior pereonites..................................................................................................... 7 7 Distinct postero-lateral spines on pereonites 4–7, cephalon anterior edge straight............................ M. vinogradovae - Small postero-lateral spines on pereonites 4–7, cephalon anterior edge slightly rounded.................... M. bipunctatusPublished as part of Vey, Aidan & Brix, Saskia, 2009, Macrostylis cerritus sp. nov., a new species of Macrostylidae (Isopoda: Asellota) from the Weddell Sea, Southern Ocean *, pp. 356-370 in Zootaxa 2096 (1) on page 367, DOI: 10.11646/zootaxa.2096.1.21, http://zenodo.org/record/532260
Prochelator tupuhi Brix & Bruce, 2008, sp. nov.
No full text<i>Prochelator tupuhi</i> sp. nov. (Figs. 1–5) <p> <i>Material examined</i>: <i>Holotype</i>: Ψ (preparatory, 3.1 mm), east of Christchurch, South Island, western Chatham Rise, 44°30.10'S, 174°18.79'E, 25 Oct 1979, 760 m, stn. S147 (NIWA 33747).</p> <p> <i>Paratypes</i>: 1 ɗ (adult, 3.2 mm; allotype), same data as holotype <b>(</b> NIWA 33748). 2 Ψ (adult) 44°45.00'S, 174°30.00'E, 18 Aug 1966, 765– 854 m, stn F753 (NIWA 33749). 1 Ψ (adult) stn. F755 and 2 Ψ stn. S/ 47(NIWA 33750).</p> <p> <i>Type locality:</i> Western Chatham Rise, east of Christchurch, South Island, New Zealand, 44°30.10'S, 174°18.79'E.</p> <p> <i>Distribution:</i> Eastern New Zealand; at depths of 760 to 864 m, from the general type locality at more than one station.</p> <p> <i>Diagnosis</i>: <i>Body</i> widest at pereonite 2; length about 4.6 times longer than width of pereonite 2. <i>Pereonites</i> 1 – 4 in female slightly higher than pereonites 5 – 7 in lateral view, in male as high as pereonites 5 – 7. Pereonite 1 length 1.4 times pereonite 2 length. Pereonite 5 length 0.8 times width. <i>Coxae</i> 1 – 4 anteriorly produced, each with robust acute setae. <i>Pereopod</i> 1 carpus broadest at articulation of propodus, slightly produced at base of claw­seta. Carpus of pereopods 2 – 4 about twice as long as carpus of pereopod 1. <i>Pleotelson</i> with posterolateral spines located at 0.6 of pleotelson length. <i>Uropods</i> biramous, exopod about half as long as endopod.</p> <p> <i>Description of holotype</i> (Fig. 1): <i>Body</i> 3.1 mm long, 4.68 times longer than width of Prn 2. Prn 1 width 1.42 times cephalon width in dorsal view. Prn 1 length 1.5 Prn 2 length, 0.84 Prn 2 width. Prn 5 width 0.82 length, anterior margin straight, lateral margin slightly convex. <i>Coxae</i> 1 – 4 produced, with large acute robust setae. <i>Pleotelson</i> length 0.98 width, large posterolateral spines present. Lateral margins convex, posterior margin slightly rounded.</p> <p> <i>Antennula</i> (Fig. 2) with six articles. Article 1 1.69 width, with four broom setae. Article 2 length 6.43 width, 2.01 article 1 length; distally with two large articulated broom setae and two small slender setae, marginally with two small slender setae. Article 3 length 3.5 width, with one short slender seta, article 4 length 3.3 width, distally with one broom seta, distal article length 3.5 width, terminally with one aesthetasc, one broom seta and two long slender setae. Articles 2 – 5 length relative to article 1: 2.01: 0.64: 0.5: 0.45: 0.32.</p> <p> <i>Antenna</i> (Fig. 2) incomplete or partly missing, only four articles available.</p> <p> <i>Mandible</i> (Fig. 2) palp article 1 with one small distal seta, article 2 ventrodistally with two small setulate setae, dorsally with rows of numerous fine microtrichia apical article with nine ventral seta, distal one longest. Incisor process with three teeth. Lacinia mobilis of left mandible with three teeth, spine row containing eight spines. Molar process with 13 fine setae.</p> <p> <i>Maxillula</i> (Fig. 2) mesial lobe about 0.7 lateral lobe length, with 25 setae. Lateral lobe 3.75 times longer than wide, marginally with pairs of fine microtrichia terminally with 12 strong robust setae.</p> <p> <i>Maxilla</i> (Fig. 2) mesial lobe 0.48 length of lateral lobes, terminally with 21 setae. Lateral lobe (one lobe lost during dissection) basally with two slender setae, terminally with 18 setae.</p> <p> <i>Maxilliped</i> (Fig. 2) epipodite length 3.85 width, length 1.06 endite length. Endite with two retinaculae, terminally with numerous fine setae. Margin of endite and palp articles 1 – 3 with row of fine setae. Palp article 2 with three setae on mesial margin and two setae on lateral margin, article 3 with five setae on mesial margin and one seta on lateral margin, article 4 with two setae, article 5 with three setae. Article 1 length 0.45 width, article 2 length 0.76 width, article 3 length 1.04 width, article 4 length 2.4 width, article 5 length 1.5 width.</p> <p> <b>FIGURE 3</b>: <i>Prochelator tupuhi</i> sp. nov., paratype female, pereopods (A–D): P 2 (A), P 3 (B), P 4 (C), P 5 (D).</p> <p> <i>Pereopod 1</i> (Fig. 2) Basis length 3.48 width, ventrally proximal to ischium with three slender setae, marginally with eight small setae. Ischium length 1.34 width, with few small setae. Merus length 0.32 width, ventrally with three small setae, ventrodistally with one robust distally setulate seta, dorsally one stout simple seta. Carpus length 1.42 width, distoventrally with large spine­like claw­seta and slender penultimate seta, medioventrally with one small distally setulate seta, dorsally two small setae. Propodus length 2.82 width, dorsally with four small setae, ventrally fringed with fine setae inserted in cuticular membrane and 14 small setae. Dactylus length 6 times width. Claw of dactylus with one cuspidate and one conate setae, two slender setae medially.</p> <p> <i>Pereopod 2</i> (Fig. 3) Basis length 4.4 width, ventrally proximal to ischium with three slender setae. Ischium length 2.3 width, ventrally with three simple setae, dorsally with one small seta. Merus length 4.31 width, ventrally with four distally setulate setae, distodorsally with one simple seta. Carpus length 5.12 width, with ventral and dorsal rows of setae, ventrally with 12 distally setulate setae, dorsally 18 simple setae. Propodus length 5.12 width, ventrally with three small setae, distodorsally one simple seta. Dactylus length 6 times width. Claw of dactylus with one conate seta.</p> <p> <i>Pereopod 3</i> and <i>4</i> are similar to pereopod 2, differing only in the number of setae.</p> <p> <i>Pereopod 5</i> (Fig. 3) Basis length 3.9 width, medially with two broom setae. Ischium length 2.37 width, dorsally with row of five slender setae. Merus length 1.3 width, with two small setae. Carpus length 3.17 width, with ventral row of 13 long slender setae and dorsal row of 11 setae, distodorsally one small broom seta. Propodus length 2.75 width, with ventral row of nine long setae and dorsal row of 10 setae, additionally with two simple setae. Dactylus length 5.25 times width, mediodistally with two small slender setae. Claw of dactylus with one long conate seta, two adjacent slender setae.</p> <p> <i>Pereopod 6</i> and <i>7</i> are similar to pereopod 5, differing only in the number of setae.</p> <p> <i>Pleopod 2</i> (operculum) (Fig. 4) length 1.2 width. Lateral margins straight, distal margin straight, with 30 simple setae.</p> <p> <i>Pleopod 3</i> (Fig. 4) Endopod length 1.31 width, distally with 3 long plumose setae. Exopod length 0.73 endopod length, margins hirsute, with one small distal seta.</p> <p> <i>Pleopod 4</i> (Fig. 4) Endopod oval­shaped, length 1.97 width. Exopod length 12 times width, distally with one long plumose seta.</p> <p> <i>Pleopod 5</i> (Fig. 4) Endopod only, length 3.08 width.</p> <p> <i>Uropods</i> (Fig. 4) biramous. Endopod length 1.4 protopod length, 7.9 times longer than wide, marginally with one slender and two broom setae, distally with three small, one slender and six broom setae. Exopod length 5 times width, 0.3 endopod length, terminally with two setae. Protopod length 4.6 width, with few small slender setae.</p> <p>Male:</p> <p> <i>Habitus</i> (Fig. 5) similar to female, but Prn 1–4 as high as Prn 5–7, Plt with larger posterolateral spines.</p> <p> <i>Pleopod 1</i> (Fig. 5) 4.72 times longer than distal width, tips with distal bulges bearing four slender setae.</p> <p> <i>Pleopod 2</i> (Fig. 5) Sympod oval­shaped, length 1.37 width, lateral margin rounded, with seven slender setae. Endopod inserting at 0.49 of sympod's length.</p> <p> <i>Discussion</i>: <i>Prochelator tupuhi</i> sp. nov. is assigned to the genus <i>Prochelator</i> on the basis of the carpochelate pereopod 1 (Wägele 1989, Brenke <i>et al.</i> 2005), one stout distally setulate seta midway on the ventral margin of the carpus, and the slender penultimate seta next to the large claw­seta.</p> <p> <i>Prochelator tupuhi</i> is easy to distinguish from <i>P. incomitatus</i> and <i>P. angolensis</i> by having biramous uropods. Both of the latter species possess a very compact anterior part of the body, with pereonite 1 being twice as long as pereonite 2. Characters distinguishing <i>P. tupuhi</i> from other species of the genus with biramous uropods are: relatively elongate body without spine­like ventral elongations on pereonites 1–4 (as in <i>P. lateralis</i>, <i>P. uncatus</i> and <i>P. h a m p s o n i</i>). The remaining species of the genus are anteriorly compact, pereonites 1–4 are higher than pereonites 5–7 from lateral view. In <i>P. tupuhi</i> pereonite 1 is as high as pereonite 5, the medial lobe of the maxilla is much shorter than in the other species of the genus, reaching only half the length of the outer lobe. The carpus of pereopod 1 is distinctly produced at the base of the claw­seta, the propodus is broadest at the articulation to the carpus and tapers distally.</p> <p> <i>Etymology</i>: The epithet is the Māori word <i>tupuhi</i> meaning thin (noun in apposition).</p>Published as part of <i>Brix, Saskia & Bruce, Niel L., 2008, Prochelator tupuhi sp. nov., the first record of Desmosomatidae Sars, 1897 (Crustacea: Isopoda) from New Zealand waters *, pp. 482-492 in Zootaxa 1866</i> on pages 485-489, DOI: <a href="http://zenodo.org/record/183873">10.5281/zenodo.183873</a>
(Janiroidea: Nannoniscidae) from the equatorial Pacific nodule province inferred from mtDNA and morphology
No full textFigure 4. Genetic divergence (p-distance) in relation to geographic distance in kilometres for N. menoti.Published as part of Kaiser, Stefanie, Kihara, Terue Cristina, Brix, Saskia, Mohrbeck, Inga, Janssen, Annika & Jennings, Robert M., 2021, Species boundaries and phylogeographic patterns in new species of Nannoniscus (Janiroidea: Nannoniscidae) from the equatorial Pacific nodule province inferred from mtDNA and morphology, pp. 1020-1071 in Zoological Journal of the Linnean Society 193 on page 1031, DOI: 10.1093/zoolinnean/zlaa174, http://zenodo.org/record/563916
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