169,859 research outputs found
Kiwaidae Macpherson, Jones & Segonzac 2005
No full textFamily Kiwaidae Macpherson, Jones & Segonzac, 2005 Kiwaidae Macpherson, Jones & Segonzac, 2005: 712. Type genus: Kiwa Macpherson, Jones & Segonzac, 2005.Published as part of Baba, Keiji, Macpherson, Enrique, Poore, Gary C. B., Ahyong, Shane T., Bermudez, Adriana, Cabezas, Patricia, Lin, Chia-Wei, Nizinski, Martha, Rodrigues, Celso & Schnabel, Kareen E., 2008, Catalogue of squat lobsters of the world (Crustacea: Decapoda: Anomura-families Chirostylidae, Galatheidae and Kiwaidae), pp. 1-220 in Zootaxa 1905 (1) on page 182, DOI: 10.11646/zootaxa.1905.1.1, http://zenodo.org/record/513458
Munidopsis hirtella Macpherson & Segonzac 2005
No full text<i>Munidopsis hirtella</i> Macpherson & Segonzac, 2005 <p> <i>Munidopsis hirtella</i> Macpherson & Segonzac, 2005: 27, fig. 7 (between Mauritania and Congo, 3125–3166 m).</p> <p>Type data: holotype, ovigerous female, MNHN Ga 4622.</p> <p>Type locality: between Mauritania and Congo, 18º29´N, 20º59´W, 3126 m.</p>Published as part of <i>Baba, Keiji, Macpherson, Enrique, Poore, Gary C. B., Ahyong, Shane T., Bermudez, Adriana, Cabezas, Patricia, Lin, Chia-Wei, Nizinski, Martha, Rodrigues, Celso & Schnabel, Kareen E., 2008, Catalogue of squat lobsters of the world (Crustacea: Decapoda: Anomura-families Chirostylidae, Galatheidae and Kiwaidae), pp. 1-220 in Zootaxa 1905 (1)</i> on page 144, DOI: 10.11646/zootaxa.1905.1.1, <a href="http://zenodo.org/record/5134587">http://zenodo.org/record/5134587</a>
Austinograea jolliveti Guinot & Segonzac 2018, n. sp.
No full textAustinograea jolliveti n. sp. (Figs 9A-H; 10A-E; 11A-E) TYPE MATERIAL. — Holotype. ♂ 12.8 × 20.0 mm (right-handed), western Pacific, North Fiji Basin, STARMER II cruise, dive 18 (PL 18), Mussel Valley site, 18°50’S, 173°29’E, 2750 m, 13.VII.1989 (MNHN-IU-2016-10769) (Figs 9A-H; 11A-E). Paratypes. 1 ♂ 14.7 × 25.4 mm, 1 ♀ 12.4 × 21.6 mm (Fig. 10A-E), same data (MNHN-IU- 2016-10770). OTHER MATERIAL EXAMINED. — 1♀ 13.6 × 22.0 mm (left-handed), western Pacific, Lau Back-Arc Basin, MGLN07MV cruise, dive 237, ABE site, 20°45.65’S, 176°11.45’E, 2130 m, 25.IX.2006, MNHN- IU-2016-10751 (preserved in ethanol 85%). TYPE LOCALITY. — Western Pacific, North Fiji Basin, Mussel Valley site, 2750 m. ETYMOLOGY. — Dedicated to Didier Jollivet (CNRS, Station biologique de Roscoff, France), in recognition of his pioneering work on the ecology of the southwestern Back-Arc Basin hydrothermal communities in 1989 and for his valuable contribution to deciphering the delicate interplay of physical and biological factors in shaping the evolutionary history of hydrothermal vent fauna. DISTRIBUTION. — Southwestern Pacific; only collected from one site in the Lau Basin (ABE site) and one site in the North Fiji Basin (Mussel Valley site). DESCRIPTION (MALE) Carapace Carapace transversely elliptical, flat; regions indistinct. Dorsal surface nearly smooth, except for rare small granules on frontal region and tubercles on orbital region; numerous small pits. Anterolateral margin marked by rounded edge, slightly granulous. Posterolateral margins convergent; posterior margin slightly concave. Subhepatic region with dense setae mainly only at lateral edge. Front broad, not protruded, bluntly pointed medially and with two slightly convex lobes. Eyes, antennules and antennae recessed under front. Suborbital plate absent. Outer side of orbital region tuberculated. Proepistome incomplete. Orbital region deeply concave and open laterally, containing antennules, antennae and possible eye remnants. Eyestalk absent, podophthalmite fused to floor of orbital region; cornea absent, no visible pigment. Antennules folded horizontally, filling most of orbit. Antenna inserted in wide supraorbital notch; urinary article fixed, broad, recessed, basal article (2 + 3) cylindrical, moveable; article 4 elongated shorter, inclined. Margin of epistome projecting medially and formed of two markedly concave lobes, marked by row of low granules. Pterygostomial lobe granulous; pterygostomial region mostly smooth. Thoracopods Third maxillipeds completely closing buccal cavity. Ischium long, with marked longitudinal internal groove. Merus about half as long as ischium, narrow; external margin regularly curved, oblique, without marked angle; half distal part markedly narrow and much produced; half proximal internal margin with prominent median lobe. Carpus inserted in notch of anterointernal margin of merus; propodus thick; dactylus about as long as merus; inner margins of propodus and dactylus with brush-like setae. Exopod longer than endopod ischium. Wide mxp3 coxa with only proximal portion visible, its lateral projection hidden by junction of thoracic sternum (sternite 4) with pterygostome. Chelipeds long, heteromorphic. Palm of both chelipeds with inner surface bearing medially thick patches of setae, densely extending along occluding margins of both fingers, thus well dorsally visible along half of fingers. Dark colour extending on about whole fixed finger (the dark coloured of half posterior portion joins the coloured spot), and on two-thirds of dactylus of both crusher and cutter. Major cheliped (crusher) stouter than minor ones (cutter); merus notably elongated, largely extending beyond margin of carapace, narrow, anterior border entirely straight, with regular, small, distally reduced teeth; both fingers thick, blunt-tipped. Crusher: palm rather long, dorsal surface slightly convex, pitted; a conspicuous but hollow depression near base of fixed finger, appearing as pigmented spot, more or less in continuity with black area of fixed finger; dactylus elongate, thick, with only one blunt median tooth; fixed finger thick, with only one blunt proximal tooth on occluding margin; fingers thick, gaping, with blunt tips. Male cutter: palm elongate, nearly flat, smooth, with a conspicuous dark spot near base of fixed finger similar to that of the crusher; both fingers thick, more elongate, occluding, with blunt tips; dactylus with occluding margin smooth; occluding border of fixed finger with one proximal small tooth, and another one small more distally. P2-P5 shorter than chelipeds; P4 longest. Meri of P2, P3 with patch of dense setae on ventral margins, the patch being dense, thicker on inferior margin; meri of P4 and P5 and carpi, propodi of P2-P5 fringed on dorsal and ventral margins with short, stiff setae, mixed with longer setae. Dactyli elongate, with patches of short setae on anterior and posterior margins. Thoracic sternum Thoracic sternum with sutures 4/5-7/8 incomplete. Median line along sternite 8 and hardly continuying along sternite 7. Junction of sternite 4 with pterygostome via rather long juxtaposition; no patch of setae. Press-button of locking mechanism acute, close to suture 5/6, lacking on a side in holotype. Pleon Pleon of six free somites and telson, regularly triangular, third somite widest; telson short, bluntly triangular, rounded distally; pleonal somite 6 longest. G1: straight, with sparse, small and short setae, arranged in two rows along mid-part only. G2: about less than half G1’s length; flagellum very short, straight, flattened. DESCRIPTION (FEMALE) Subhepatic region without patches of dense setae. Chelipeds slightly dimorphic, both as cutters, major cheliped being hardly longer than minor cheliped; merus not elongated; chelae not markedly dissimilar; as in males, a pigmented spot near base of fixed finger on both propodi; both fingers not gaping, with acute tips. No pleonal locking mechanism. Pleon with margins densely fringed with setae. Vulvae rounded, closed by soft membrane. COMPARATIVE DIAGNOSIS The description of Austinograea jolliveti n. sp. is based on four, rather small specimens, from two vent sites. The species can be, however, distinguished from all other known Austinograea species by: 1) small size (to be checked on additional material); 2) subhepatic region with dense setae only at lateral edge (this feature needs to be checked on additional male material); 3) merus of male cheliped long, markedly extending beyond carapace margin, narrow on its whole length, regularly toothed on dorsal margin; 4) dorsal surface of propodus of both chelae in both sexes (Figs 9E, G; 10A, C) with a differently pigmented spot at the limit of the fixed finger (versus only one spot in male A. williamsi, and two spots in male A. hourdezi n. sp., moreover located on the anterior portion of the palm in both species, instead at the basis of fixed finger in A. jolliveti n. sp.); and 5) G2 much shorter than G1 and with a very reduced, straight flagellum (Figs 9D; 11E) (compare with fig. 8 of Tsuchida & Hashimoto 2002, showing the two pairs of gonopods in A. alayseae, A. williamsi, and A. rodriguezensis). The unique spot near the base of dactylus on dorsal surface of both chelae in both sexes of A. jolliveti n. sp. (Figs 9E, G; 10A, C) is of a different nature from the two depressions of A. hourdezi n. sp. It shows as a differently pigmented “pustule” and is similar to the violaceous spot of Bythograea microps Saint Laurent, 1984 (from the East Pacific Rise) in about the same location, i.e., at the base of the palm of the male minor chela and of both female chelae (Guinot & Segonzac 1997: figs 7C, 9D-F; 2006c: 468, fig. 5; Guinot & Hurtado 2003). This pigmented spot, supposedly sensory, easily allows distinguishing male and female A. jolliveti n. sp. from all other Austinograea species, and also from Gandalfus.Published as part of Guinot, Danièle & Segonzac, Michel, 2018, A review of the brachyuran deep-sea vent community of the western Pacific, with two new species of Austinograea Hessler & Martin, 1989 (Crustacea, Decapoda, Brachyura, Bythograeidae) from the Lau and North Fiji Back-Arc Basins, pp. 75-107 in Zoosystema 40 (5) on pages 89-90, DOI: 10.5252/zoosystema2018v40a5, http://zenodo.org/record/373810
Kiwa hirsuta Macpherson, Jones & Segonzac 2005
No full textKiwa hirsuta Macpherson, Jones & Segonzac, 2005 Kiwa hirsuta Macpherson et al., 2005: 713, figs 3–8 (South East Pacific Rise, vent site area named Annie's Anthill, 2228 m). — Segonzac, 2006: 450, figs (no record). Type data: holotype, male, MNHN Ga 5310. Type locality: South East Pacific Rise, vent site area named Annie's Anthill, 37º46.49´S, 110º54.72´W, 2228 m.Published as part of Baba, Keiji, Macpherson, Enrique, Poore, Gary C. B., Ahyong, Shane T., Bermudez, Adriana, Cabezas, Patricia, Lin, Chia-Wei, Nizinski, Martha, Rodrigues, Celso & Schnabel, Kareen E., 2008, Catalogue of squat lobsters of the world (Crustacea: Decapoda: Anomura-families Chirostylidae, Galatheidae and Kiwaidae), pp. 1-220 in Zootaxa 1905 (1) on page 182, DOI: 10.11646/zootaxa.1905.1.1, http://zenodo.org/record/513458
Alvinocaridinides semidentatus Komai, Menot & Segonzac, 2016, n. sp.
No full text<i>Alvinocaridinides semidentatus</i> n. sp. <p>Figs 1–5</p> <p> <b>Material examined</b>. Holotype: DS “Nautile”, dive 1778, Kulo Lasi, Futuna, 14°54.9653’S, 177°14.607’W, 1477 m, 13 September 2010, slurp gun, bottle 4, male (cl 8.3 mm), MNHN-IU-2013-19402.</p> <p> <b>Description</b>. <i>Holotype male</i>. Body (Fig. 1) integument almost glabrous, but with sparse very short setae on dorsal margin of rostrum to postrostral region of carapace.</p> <p>Rostrum (Fig. 2 A–C) dorsoventrally flattened, directed forward, triangular in dorsal view, reaching midlength of first segment of antennular peduncle, terminating in acute tip; dorsal surface bluntly carinate medially, armed with 4 small but conspicuous, sharp teeth only in distal half, and with short setae along midline; ventral surface slightly convex, unarmed; lateral margin merging into orbital margin. Carapace (Figs 1, 2 A, B) with dorsum nearly straight in lateral view; antennal tooth acute, directed anteriorly; pterygostomial angle terminating into sharp tooth directed forward and slightly exceeding beyond antennal tooth.</p> <p>Pleon (Fig. 1) dorsally rounded. First to third pleura broadly rounded, unarmed on margins; fourth pleuron with tiny posteroventral tooth, otherwise unarmed; fifth pleuron with moderately strong posteroventral tooth and 1 additional tooth on posterior margin. Sixth pleomere 1.7 times as long as fifth pleomere and 1.5 times as long as high, with tiny posteroventral tooth, posterolateral process terminating in sharp tooth. Telson (Fig. 2 D, E) falling well short of posterior margins of uropods, 2.7 times as long as greatest width at midlength, armed with 6 (left) or 7 (right) dorsolateral spines arranged in sinuous row (second and third spines located more mesially than first or other spines); lateral margins faintly convex; posterior margin well produced, strongly convex, with row of long plumose setae flanked by 2 pairs of spines at posterolateral angles (mesial spine much longer than lateral spine).</p> <p>Eyes (Fig. 2 A, B) broadly fused with faint median notch, lacking setae on anterior surface, clearly separated from ventral surface of rostrum; no spinule or tubercle on each anterior surface.</p> <p>Antennular peduncle (Fig. 2 A, B) stout, falling slightly short of distal margin of antennal scale. First segment with moderately large distolateral tooth and small distomesial tooth and bluntly pointed proximolateral tubercle; stylocerite slender, nearly straight, reaching midlength of second segment. Second segment about 1.2 times as long as wide, with distomesial tooth larger than corresponding tooth on first segment.</p> <p>Antennal peduncle (Fig. 2 A, B, F) with stout basicerite bearing ventrolateral distal tooth extending as far as dorsolateral distal projection, ventral surface without conspicuous tooth or projection. Fifth segment (= carpocerite) slightly overreaching midlength of antennal scale. Antennal scale suboval, about half as long as carapace, 2.0 times as long as wide; distolateral tooth acuminate, clearly separated from lamella, not reaching distal margin of lamella.</p> <p>Mouthparts typical of family (for detailed description, see Komai and Segonzac 2003, 2005; Komai et al. 2007), as figured (Figure 3 A–H). Endopod of maxillule with 1 apical plumose seta at inner distal angle and 1 terminal and 1 shorter subterminal setae on outer lobule (Fig. 3 C). Maxilla (Figure 3 D) with broad scaphognathite, devoid of bacteriophore setae on ventral surfaces; posterior lobe subtriangular, tapering to rounded apex. Endopod of first maxilliped somewhat compressed, uniarticulate (Fig. 3 F); exopod with rudimentary bud of flagellum (Fig.</p> <p>3F). Second maxilliped (Fig. 3 G) with fairly stout endopod; epipod roundly triangular, with simple, slender podobranch with tip exceeding margin of epipod (Fig. 3 H).</p> <p>Third maxilliped (Figure 4 A) overreaching distal margin of antennal scale by 0.3 length of ultimate segment, moderately slender. Ultimate segment tapering to subtruncate tip bearing 2 unequal spines, trigonal in cross section, with row of stiff setae on lateral ridge. Ultimate and penultimate segments gently arcuate. Antepenultimate segment sinuous, with slender spine at ventrolateral distal angle and prominent tuft of long setae at proximomesial portion on dorsal surface. Coxa with epipod subtruncate terminally (Fig. 5 A), without strap-like projection.</p> <p>First pereopod (Fig. 4 B) fairly stout, overreaching distal margin of antennal scale by length of fingers. Chela (Fig. 5 B) distinctly longer than carpus; palm squarish, subequal in length to carpus; fingers strongly curved inward, inner side forming spoon-like excavation, fixed finger somewhat deflexed; cutting edges of fingers each pectinated with fine row of minute corneous teeth. Carpus cup-shaped; ventral margin with prominent, subtriangular tooth subdistally; mesial face shallowly excavated medially, bearing grooming apparatus consisting of patch of stiff setae and 1 proximal spinule (Fig. 5 C). Merus somewhat inflated on ventral surface medially; articulation to ischium strongly oblique.</p> <p>Second pereopod (Fig. 4 C) reaching distal margin of antennal scale. Chela (Fig. 5 D) 1.3 times as long as carpus; fingers each terminating in distally curved, crossing tip, cutting edge pectinated with row of minute spinules; dactylus about 1.1 times as long as palm, slightly widened medially. Carpus slightly widened distally. Ischium unarmed.</p> <p>Third pereopod (Fig. 4 D) overreaching antennal scale by full length of propodus; dactylus only slightly compressed laterally, 0.2 times as long as propodus, terminating in strong, slightly curved unguis, broad flexor surface with 7 spinules arranged in 2 rows (Fig. 5 E, G); propodus with 1 pair of distal spinules and 1 row of closely spaced minute spiniform setae on flexor surface extending to proximal 0.2 (Fig. 5 E, F), dorsal and mesial faces with scattered short setae; carpus 0.9 times as long as propodus; merus unarmed; ischium with 2 spines on lateral surface ventrally. Fourth pereopod (Fig. 4 E) similar to third pereopod, but slightly shorter; ischium with 1 spine. Fifth pereopod (Fig. 4 F) generally similar to third and fourth; propodus with spiniform setae arranged in 2 longitudinal rows, lateral row consisting of minute spinules extending to proximal 0.2 and more widely spaced toward proximal, mesial row consisting of widely spaced spinules restricted in distal 0.3; propodus and carpus combined distinctly longer than merus and ischium combined; ischium unarmed.</p> <p>No epipods on first to fourth pereopods.</p> <p>Endopod of male first pleopod (Fig. 2 G) with distomesial lobe prominent, tapering, with numerous long spiniform setae directed distally or mesially, distolateral lobe obsolete; mesial margin with row of plumose setae, lateral margin also with row of spiniform setae followed by row of plumose setae. Second pleopod with appendix masculina (Fig. 2 H) stout, tapering to blunt apex, bearing 6 spiniform setae distally and subdistally appendix interna short, slender. Third and fourth pleopods each with fairly reduced appendix interna lacking coupling hooks. Fifth pleopod with normally developed appendix interna bearing coupling hooks mesiodistally.</p> <p>Uropod with protopod bearing terminally acute posterolateral process (Fig. 1); exopod with 2 subequal spines at posterolateral angle (Fig. 2 I).</p> <p> <b>Distribution</b>. Known only from the type locality, Kulo Lasi site, off Futuna Islands, at a depth of 1477 m.</p> <p> <b>Remarks</b>. The genus <i>Alvinocaridinides</i> was established by Komai & Chan (2010) to accommodate <i>A. formosa</i> Komai & Chan, 2010. Vereshchaka <i>et al</i>. (2015) performed a phylogenetic analysis of Alvinocarididae using morphology and sequences of mitochondrial COI gene and clarified the generic level classification. As a result, they retained <i>Alvinocaridinides</i> as a valid genus, although the phylogenetic position of the taxon was not fully resolved. We assign our new species to <i>Alvinocaridinides</i>, one of the genera intermediate between the rather conservative <i>Alvinocaris</i> Williams & Chace, 1982 and the highly derived <i>Rimicaris</i> Williams & Rona, 1986 (cf. Vereshchaka et al. 2015) because of the following features: (1) rostrum dorsoventrally flattened, terminally acute, dentate dorsally but non-dentate ventrally; (2) rostral ridge not extending onto dorsum of carapace; (3) antennal and pterygostomial tooth acuminate, no suborbital lobe differentiated; (4) pleura of fourth and fifth pleomeres weakly dentate marginally; (5) telson with dorsolateral spines arranged in sinuous row; (6) dactyli of third to fifth pereopods less compressed, with accessory spinules on flexor surfaces arranged in two rows; (7) meri of third to fifth pereopods unarmed; (8) exopod of uropod with two posterolateral spines.</p> <p> The new species exhibits unusual features for Alvinocarididae: (1) the dorsal margin of the rostrum is armed only on the distal half with small but conspicuous teeth; (2) the propodi of the third and fourth pereopods bear a single row of closely spaced minute spiniform setae on the flexor surface respectively. In species of <i>Alvinocaris</i> Williams & Chace, 1982, <i>Alvinocaridinides</i>, <i>Manuscaris</i> Komai & Tsuchida, 2015, <i>Nautilocaris</i> Komai & Segonzac, 2004 and <i>Shinkaicaris</i> Komai & Segonzac, 2005, the dorsal margin of the rostrum is armed with teeth over the entire length (Komai & Segonzac 2004, 2005; Webber 2004; Komai <i>et al</i>. 2005; Ahyong 2009; Zelnio & Hourdez 2009; Komai & Chan 2010; Yahagi <i>et al</i>. 2014; Komai & Tsuchida 2015) and while in species of <i>Rimicaris</i> Williams & Rona, 1986, the dorsal surface of the rostrum is completely unarmed (Komai & Segonzac 2003, 2008; Komai <i>et al</i>. 2006, 2007; Komai & Tsuchida 2015). In <i>Keldishcaris vavilovi</i> (Lunina & Vereshchaka, 2010) and <i>Opaepele loihi</i> Williams & Dobbs, 1995, the dorsal margin of the rostrum lacks conspicuous teeth, although there are sometimes minute notches suggesting the presence of rudimentary teeth (Williams & Dobbs 1995; Lunina & Vereshchaka 2010). The propodi of the third and fourth pereopods are armed with two or more rows of moderately to widely separated spinules in all the other species of Alvinocarididae (Komai & Segonzac 2003, 2004, 2005, 2008; Webber 2004; Komai <i>et al</i>. 2005, 2006, 2007; Zelnio & Hourdez 2009; Komai & Chan 2010; Lunina & Vereshchaka 2010; Nye et al. 2012; Yahagi et al. 2014; Komai & Tsuchida 2015; Komai, unpublished data).</p> <p> Furthermore, <i>A. semidentatus</i> <b>n. sp.</b> differs from <i>A. formosa</i> in the following particulars: (1) the telson is not tapered posteriorly with faintly convex lateral margins in <i>A. semidentatus</i> <b>n. sp.</b>, rather than regularly tapered posteriorly with straight lateral margins in <i>A. formosa</i>; (2) the chela of the second pereopod is longer than the carpus in the new species, whereas the opposite in <i>A. formosa</i>; (3) the dactyli of the third to fifth pereopods are less compressed in <i>A. semidentatus</i> <b>n. sp.</b> than in <i>A. formosa</i>; and (4) the ischia of the third and fourth pereopods are armed with two and one spines respectively in <i>A. semidentatus</i> <b>n. sp.</b>, rather than unarmed in <i>A. formosa</i>.</p> <p> Komai & Chan (2010) argued that the unarmed ischia of the third and fourth pereopods are one of the possible apomorphic characters suggesting the relationship of <i>Alvinocaridinides</i> to <i>Shinkaicaris</i>, <i>Opaepele</i> and <i>Rimicaris</i> [now including <i>Chorocaris</i> synonymized by Vereshchaka <i>et al.</i> (2015)]. The present assignment of the new species to <i>Alvinocaridinides</i> might make <i>Alvinocaridinides</i> paraphyletic. Consequently, the generic assignment of the present new species should be considered provisional.</p> <p> The holotype was sampled together with specimens of <i>Rimicaris variabilis</i> in a swarm of alvinovaridid shrimps lying on a pocket of hydrothermal sediments next to a small black smoker.</p> <p> <b>Etymology</b>. The specific name is combined from the Latin <i>semis</i> (= half) and <i>dentatus</i> (= dentate), referring to the rostrum armed with teeth only on the distal half of the dorsal margin, an unusual feature in the family.</p>Published as part of <i>Komai, Tomoyuki, Menot, Lenaick & Segonzac, Michel, 2016, New records of caridean shrimp (Crustacea: Decapoda) from hydrothermally influenced fields off Futuna Island, Southwest Pacific, with description of a new species assigned to the genus Alvinocaridinides Komai & Chan, 2010 (Alvinocarididae), pp. 298-310 in Zootaxa 4098 (2)</i> on pages 300-305, DOI: 10.11646/zootaxa.4098.2.5, <a href="http://zenodo.org/record/271123">http://zenodo.org/record/271123</a>
Figure 15 in A revision of the genus AlIJinocaris Williams and Chace (Crustacea: Decapoda: Caridea: Alvinocarididae), with descriptions of a new genus and a new species of AlIJinocaris
No full textFigure 15. Alυinocaris stactophila Williams, 1988. (A) Carapace and cephalic appendages, lateral; (B) anterior part of carapace and cephalic appendages, dorsal; (C) third to sixth abdominal somite, lateral; (E) telson and left uropod, dorsal; (F) posterior margin of telson, dorsal. Holotype male from Bush Hill hydrocarbon seep, Gulf of Mexico (534 m) (CL 7.0 mm; USNM 234291).Published as part of Komai, Tomoyuki & Segonzac, Michel, 2005, A revision of the genus AlIJinocaris Williams and Chace (Crustacea: Decapoda: Caridea: Alvinocarididae), with descriptions of a new genus and a new species of AlIJinocaris, pp. 1111-1175 in Journal of Natural History 39 (15) on page 1144, DOI: 10.1080/00222930400002499, http://zenodo.org/record/458149
Ventichthys biospeedoi Nielsen, Møller & Segonzac, 2006, new species
No full textVentichthys biospeedoi, new species (Figs. 1-8) Ophidiidae: Geistdoerfer 1996, fig. 6. Materials Holotype: MNHN 2004-2037, 266 mm SL, male, South East Pacific Rise, hydrothermal vent site Oasis, 17°25.38’S, 113°12.29’W; BIOSPEEDO cruise, submersible Nautile, R/V Atalante, dive PL 1582, baited trap B2, depth 2586 m, 22 April 2004, collected by Michel Segonzac. Paratype: MNHN 2004-2038, 282 mm SL, sex unknown, same data as for holotype. Prior to the taxonomic examination the paratype had been eviscerated so that only the kidneys remain. Diagnosis See generic diagnosis. Description The principal meristic and morphometric characters are shown in Table 3. Where there are differences between the holo- and the paratype those of the paratype are given in brackets. Body short and compressed, snout blunt; small, oval, imbricate scales covering body, head and proximal part of dorsal, caudal, anal and pectoral fins; ca. 250 scales in a line from upper part of gill slit to base of caudal fin; dorsal fin origin above hind margin of pectoral fin, anal fin origin slightly behind midpoint of fish, pectoral fin short and rounded, and longest pelvic fin ray reaching one fourth the distance from its base to anal fin; length of head about twice in preanal length; horizontal diameter of eye 1.5 times in length of snout; anterior nostril placed midway between upper lip and posterior nostril, both nostrils with a low rim; upper jaw ending just behind eye, maxillaries partly sheathed posterodorsally; a strong opercular spine well hidden by skin; anterior gill arch (Fig. 2) with 5(3) knobs on upper branch, one long raker in the angle and lower branch with 10(9) long and 6 knobs; 65 gill filaments, longer than the long gill rakers; length of the 2 pseudobranchial filaments about half eye diameter. Dentition (Fig. 3). All teeth small and conical; premaxilla with 5 rows anteriorly at symphysis, merging into 3 rows posteriorad; vomer horseshoe-shaped, with 13(25) teeth in 2-3 rows; palatines with 6(5) rows of up to 15(19) teeth; dentary with 4 rows anteriorly at symphysis, merging into 2 rows posteriorad. One median basibranchial tooth patch with rather weak teeth. Head pores (Fig. 4). Supraorbital pores 1 placed above opercular flap (often termed “first lateral line pore” - see Møller et al., 2004, p. 145); infraorbital pores 5(3 anterior and 2 posterior), the posterior one the largest; mandibular pores 5(2 anterior and 3 posterior), the second anterior pore from both sides with joint opening, the posterior pore large with low rim; preopercular pore 1. Lateral lines (Fig. 4). Four rows of small, tube-shaped, widely separated neuromasts. A short row in front of the dorsal fin with 12(10) neuromasts, a row below the entire dorsal fin with 45(44) neuromasts, a median row from the vertical through the anal fin origin to the origin of the caudal fin with 15(14) neuromasts, and a ventral row from the vertical through the anal fin origin to origin of the caudal fin with 15(12) neuromasts. The small neuromasts are very difficult to observe having a colour similar to the body. Sagittal otolith (Fig. 5). Sagitta oval and thick, 1.5 times as long as high and 3 times as long as thick. The large sulcus is undivided and much wider anteriorly than posteriorly. The dorsal rim is flat with a pronounced postdorsal angle. Axial skeleton (Fig. 6). Tips of neural and haemal spines pointed; first neural spine half the length of second spine; vertebrae 4-9 with somewhat depressed neural spines; bases of vertebrae 5-12 enlarged; parapophyses on posterior 9 precaudal vertebrae; pleural ribs on vertebrae 3-17(3-16); epipleural ribs on vertebrae 5 through 16 (4 through 15). Internal organs. The 15 mm long and 5 mm broad testes are joined in a spindle-like shape similar to the ovaries in many other ophidiiform species. Histological sections showed, however, typical unripe testicular tissue. The kidneys are unusual by being located posterior to the thick-skinned swimbladder and by forming a large, compact, darkblue body posterior-most in the abdominal cavity (Fig. 7); histological sections of the “body” from the paratype proved to be kidney tissue. The large stomach almost reaches the anal opening and the short intestine forms four coils. One thick pyloric coecum. Coloration. After one year of preservation the specimens are light brown to whitish with bluish eyes. Photos of Ventichthys biospeedoi specimens taken in situ show a greyish coloration. Biology The holotype, a male with spindle-formed, unripe testes, does not contain any identifiable stomach contents. The paratype was eviscerated only leaving the strangely formed kidneys which may be an adaptation to the special conditions near the vents. The capture of the two specimens in a baited trap indicates a necrophagous diet. Fig. 8A shows specimens grazing on the bottom. The poorly developed teeth and the presence of 10-11 long gill rakers on the anterior arch indicate that it preys upon rather small food-items. The thick skin could be an adaptation to endure the high temperatures in the hydrothermal vent area. The same condition is found in another vent-fish, Thermichthys hollisi. The presence of a male without an intromittant organ shows that it is oviparous. Habitat The vent site Oasis is composed of active black smokers covered with the tubeworm polychaete Alvinella spp., large patches of mussels, clams and stalked cirripeds. A milky fluid diffuses from crevices and collapsed lava lakes, with clouds of swimming amphipods. The two specimens here studied were collected next to such a hole (Jollivet et al., 2004, fig. 3), surrounded by the mytilid mussel Bathymodiolus thermophilus Kenk & Wilson, 1985, the clam Calyptogena magnifica Boss & Turner, 1980, the stalked barnacle Neolepas cf. zevinae Newman, 1979, actinostolid sea-anemones (Chondrophellia-like), the bythograeid crab Bythograea thermydron Williams, 1980, the galatheid crab Munidopsis sp. and a recently described nematocarcinid shrimp, Nematocarcinus burukowskyi Komai & Segonzac, 2005. Other fish occur in this environment such as the synaphobranchid Ilyophis saldanhai Karmovskaya & Parin, 1999, the bythitid Thermichthys hollisi (Cohen et al., 1990) and an unidentified hagfish. Additional V. biospeedoi specimens were observed at other sites (see “Distribution”) visited during the BIOSPEEDO cruise, between 2585 and 2840 m (Jollivet et al., 2004), at places sometimes ten or more individuals swimming in the shimmering vent fluids with temperatures between 2 and 7°C (Fig. 8B). Distribution Known only from the South East Pacific Rise, where it was caught on hydrothermal vent site Oasis (17°25.38’S, 113°12.29’W, 2586 m) and observed on three additional sites: Yaquina (7º25’S, 107º48’W, 2750 m), Hobbs (17º35’S, 113º15’W, 2595 m) and Gromit (21º34’S, 114º18’W, 2840 m).Published as part of Jørgen G. Nielsen, Peter Rask Møller & Michel Segonzac, 2006, Ventichthys biospeedoi n. gen. et sp. (Teleostei, Ophidiidae) from a hydrothermal vent in the South East Pacific., pp. 13-24 in Zootaxa 1247 on pages 16-2
Kiwa Macpherson, Jones & Segonzac 2005
No full textGenus <i>Kiwa</i> Macpherson, Jones & Segonzac, 2005 <p> <i>Kiwa</i> Macpherson <i>et al.</i>, 2005: 712 (gender: feminine).</p> <p> Type species: <i>Kiwa hirsuta</i> Macpherson <i>et al.</i>, 2005, by monotypy.</p>Published as part of <i>Baba, Keiji, Macpherson, Enrique, Poore, Gary C. B., Ahyong, Shane T., Bermudez, Adriana, Cabezas, Patricia, Lin, Chia-Wei, Nizinski, Martha, Rodrigues, Celso & Schnabel, Kareen E., 2008, Catalogue of squat lobsters of the world (Crustacea: Decapoda: Anomura-families Chirostylidae, Galatheidae and Kiwaidae), pp. 1-220 in Zootaxa 1905 (1)</i> on page 182, DOI: 10.11646/zootaxa.1905.1.1, <a href="http://zenodo.org/record/5134587">http://zenodo.org/record/5134587</a>
Austinograea hourdezi Guinot & Segonzac 2018, n. sp.
No full textAustinograea hourdezi n. sp. (Figs 3A; 4A-E; 5A-H; 6A-E; 7A-H) Austinograea sp. aff. williamsi Guinot, 1990: 898 (Addenda), 900, 901. — Guinot & Segonzac 2006b: 460, fig. 1. — Mateos et al. 2012: 1, 5, 6, 10, figs 1, 2, table 1. TYPE MATERIAL. — Holotype. MNHN-IU- 2016-10737, ♂ 25.7 × 40.2 mm, southwestern Pacific, Lau Back-Arc Basin, TUIM06MV cruise, dive 142, Tow Cam site, 20°19.07’S, 176°08.24’W, 2719 m, 19.V.2005: right-handed individual, with left cheliped and all P2- P5 detached (Figs 4A-C; 6A-E). Paratypes. MNHN-IU- 2016-10738, same data, 1 ♂ 29.8 × 48.1 mm (left-handed, two spots on both chelae, with weak heterochely and heterodonty) (Fig. 5A-H), 1 ♂ 24.7 × 36.0 mm (left-handed, with small regenerated right chela, bearing only one spot). MNHN-IU- 2016-10745 (= MNHN-B24060), 3 ♂ 21.0 × 32.8 mm, 18.7 × 28.0 mm, 18.3 × 29.2 mm, 5 ♀ 25.0 × 40.0 mm (two P1 lacking), 19.1 × 32.2 mm, 18.3 × 28.2 mm, 18.3 × 28.4 mm (Fig. 7A- H), cl 19.1 mm (bad condition), Lau Back-Arc Basin, BIOLAU cruise, BL 12, Vai Lili site, 23°13’S, 176°38’W, 1750 m, 24.V.1989. MNHN-IU-2016-10747 (= MNHN-B24059), 2 ♂ 18.0 × 31.0 mm, 17.0 × 28.0 mm, 1 ♀ 16.4 × 26.8 mm, Lau Back-Arc Basin, BIOLAU cruise, dive BL 03, Hine Hina site, 22°32’S, 176°43’W, 1853 m, 15.V.1989. MNHN-IU- 2016-10739, 1 ♀ (with two cutters) 28.4 × 46.8 mm, Lau Back-Arc Basin, Lau Basin 2009 cruise, dive 424, Kilo Moana site, 20°03.23’S, 176°08.01’W, 2623 m, 07.IX.2009. MNHN-IU- 2016-10741, 1 ♀ 25.3 × 40.0 mm, Lau Back-Arc Basin, TUIM06 MV cruise, dive 140, Kilo Moana site, 20°03.23’S, 176°08.01’W, 2623 m, 17.V.2005. MNHN-IU- 2016-10740, 1 ♂ 21.4 × 34.3 mm, Lau Back-Arc Basin, MGLN07MV cruise, dive 232, Tu’i Malila site, 21°59.34’S, 176°34.09’W, 1891 m, 11.IX.2006 (preserved in ethanol 85%). MNHN-IU- 2016-10743, 1 big damaged ♂ (with detached legs), Lau Back-Arc Basin, MGLN07MV cruise, dive 231, ABE site, 20°45.65’S, 176°11.45’W, 2130 m, 09.IX.2006 (preserved in formalin 10% then transferred to ethanol 70%). MNHN-IU- 2016-10746 (= MNHN-B27831), 1 ♀ cl 28.2 mm (left part broken), North Fiji Basin, STARMER II cruise, dive PL 16, White Lady site, 16°59.50’S, 173°55.47’E, 2000 m, 11.VII.1989. MNHN-IU- 2016-10742, 4 ♀ 19.4 × 39.3 mm, 20.5 × 33.2 mm, 19.0 × 30.0 mm, 25.0 × 40.0 mm, TUIM06MV cruise, dive 151, box 2, North Fiji Basin, White Lady site, 16°59.50’S, 173°55.47’E, 2000 m, 30.V.2005. TYPE LOCALITY. — Southwestern Pacific, Lau Back-Arc Basin, Tow Cam site, 20°19.07’S, 176°08.24’W, 2719 m. OTHER MATERIAL EXAMINED. — MNHN-IU- 2016-10748 (= MNHN- B27827), 1 ♀ cl 29.2 (damaged, left P1 lacking), North Fiji Basin, STARMER II cruise, dive PL 20, White Lady site, 16°59.50’S, 173°55.47’E, 2000 m. MNHN-IU- 2016-10744, 2 ♀ 26.0 × 42.0 mm, 26.0 × 40.0 mm, Lau Back-Arc Basin, Lau Basin 2009 cruise, dive 427, ABE site, 20°45.65’S, 176°11.45’W, 2130 m, 28.V.2009 (preserved in ethanol 85%). This sample with two typical females devoid of spots on chelae palm also contains a female 27.1 × 44.6 mm with a spot (a unique spot) on each chela (see Individuals with regenerated chelae). MNHN-IU- 2016-10752, 1♀ 30.0 × 48.5 mm, Lau Back-Arc Basin, MGLN07MV cruise, dive 230, Kilo Moana site, 20°03.23’S, 176°08.01’W, 2623 m, 07.IV.2006 (preserved in formalin 10% and then transferred into ethanol 70%). This large right-handed female, with heterochely and heterodonty (Fig. 4D, E), is atypical due to the presence two spots on the chelae (on the crusher, one marked dark spot plus a faint another one, only discernible as yellow trace; on the cutter, two indistinct spots, only as yellow traces), conversely to typical females that are devoid of any spot. MNHN-IU- 2016-10768 (= MNHN-B27834), 1 ♀ 22.7 × 36.5 mm, North Fiji Basin, STARMER II cruise, dive PL 18, Mussel Valley, 18°50’S, 173°29’E, 2750 m, 13.VII.1989. This atypical female bears a spot on each chela. MNHN-IU- 2016-10765, only one big crusher chela (with two spots) and several pereopods, Lau Back-Arc Basin, no other data. Collection C. R. Fisher. 2 ♀, southwestern Pacific, Lau Back-Arc Basin, MGLN07MV, dive J2-232, Tu’i Malila site, 21°59.34’S, 176°34.09’W, 1891 m, 11.IX.2006 (preserved in formalin 10% and then transferred into ethanol 70%); 2 ♀, Lau Back-Arc Basin, MGLN07MV, dive 231, ABE site, 20°45.65’S, 176°11.45’W, 09.IX.2006 (preserved in formalin 10% and then transferred into ethanol 70%); 2 ♀, Lau Back-Arc Basin, Lau Basin 2009 cruise, dive 425, ABE site, 20°45.65’S, 176°11.45’W, 2130 m, 25.V.2009 (preserved in ethanol 85%). ETYMOLOGY. — Dedicated to Stéphane Hourdez (CNRS, Station biologique de Roscoff, France) in recognition of his valuable contribution to the knowledge of hydrothermal fauna sites (taxonomy, ecology, physiology, adaptation, phylogeny). He actively participated in the taxonomic sampling during the C. R. Fisher’s cruises in the Lau Basin, suspecting the presence of new Austinograea. DISTRIBUTION. — Austinograea hourdezi n. sp. is a widespread species encountered in the southwestern Pacific from numerous vent fields of the Lau and North Fiji Back-Arc Basins. It cohabits with A. alayseae at a number of sites, and the two species seem to share a similar distribution. As A. alayseae, A. hourdezi n. sp. has not been found in the northwestern Pacific, at least after the revision of the MNHN collection and without, however, the examination of an extensive material from the Mariana Trough. For its part, A. williamsi seems to be confined to the northwestern Pacific, in the Mariana Back-Arc Basin, and vent sites of the Mariana Trough. DESCRIPTION (MALE) Carapace Carapace transversely elliptical, flat; regions indistinct. Dorsal surface nearly smooth, except for rare small granules on frontal region and small tubercles on orbital region; numerous small pits. Anterolateral margin marked by rounded edge, slightly granulous. Posterolateral margins convergent; posterior margin slightly concave. Subhepatic regions entirely covered by patches of dense setae. Front broad, not protruded, bluntly pointed medially and with two slightly concave lobes. Eyes, antennules and antennae recessed under front. Suborbital plate absent. Orbit not delimited, only an orbital region that extends as groove lateral to region containing vestigial eyestalks and antennae. Outer side of orbital region tuberculated. Eyestalk not moveable, showing as fixed piece fused to floor of orbital region; no cornea. Antennules folded horizontally. Antenna inserted in wide supraorbital notch; urinary article fixed, broad, recessed; basal article (2 +3) cylindrical, moveable; article 4 slightly elongated, inclined; flagellum of about 10 articles. Proepistome incomplete. Margin of epistome with moderate median projection and formed of two moderately concave lobes, marked by row of low granules. Pterygostomial lobe tuberculous; pterygostomial region smooth, except for small curved ridge. Thoracopods Third maxillipeds completely closing buccal cavity. Ischium long, with marked longitudinal internal groove. Merus: external margin regularly curved, oblique, without marked angle, with distal part markedly narrow and produced; internal margin with prominent lobe in half proximal portion. Carpus inserted in notch of antero-internal margin of merus; propodus thick; dactylus about as long as merus; inner margins of propodus and dactylus with brush-like setae. Exopod longer than endopod ischium. Mxp3 coxa with only proximal portion visible, its lateral projection hidden by junction of thoracic sternum (sternite 4) with pterygostome. Chelipeds heteromorphic, marked heterochely (also in females, see below), with two types of chelae: major cheliped blunt-tip (crusher), stouter and shorter than pointed-tip minor chela (cutter). Carpus with setae on superior margin and inner surface; merus long, triangular in cross section, anterior border straight, with blunt teeth, smaller distally. Propodus of both chelae with two conspicuous, deep depressions at outer surface of palm near base of dactylus (absent in females), both as two dark spots, even well visible in specimens photographed in situ. Inner surface of both chelae dished on half posterior part; thick patches of dense setae largely extending on half anterior part of propodus and partially extending along occluding margins. Dark colour extending on about three-quarters of fixed finger and practically on whole part of dactylus of both crusher and cutter. Crusher: palm convex, inflated, smooth, except for two depressions located near base of dactylus: one horizontally directed and the largest; the other obliquely directed, smaller. Fingers thick, slightly gaping at occluding margins; two weak, blunt teeth, proximal and median, on occluding margin of dactylus; a blunt but marked subproximal tooth and smaller ones on occluding margin of fixed finger. Cutter: palm elongate, with subparallel borders, smooth, except for two depressions near base of dactylus, similar to those of the crusher; both fingers not gaping at the occluding margins; dactylus elongate, hollowed, with occluding margin smooth; fixed finger very thick, dished on inner surface; occluding margin nearly straight, with 2-3 small teeth, size progressively diminishing forwards. P2-P5 shorter than chelipeds; P3 and P4 longest; meri with patch of dense setae on ventral margins, carpi, propodi fringed on dorsal and ventral margins with felt of short, stiff setae, mixed with sparse longer setae, the patch being dense, thicker on inferior margin. Dactyli rather stout, with patches of short setae. Thoracic sternum Thoracic sternum with sutures 4/5-7/8 incomplete but separared by short gap; suture 2/3 complete. Median line only along sternite 8, hardly continuying along sternite 7. Junction of sternite 4 with pterygostome represented by only short juxtaposition, without patch of setae. Press-button of locking mechanism acute, very close to suture 5/6. Pleon Pleon of six free segments and telson regularly triangular; pleonal somite 3 widest; pleonal somite 6 longest, anterointernally delineated by raised, thick margin; telson triangular, rounded distally. Both G1 joining at tips. G1: slender, faintly curved, with only short, spiniform setae arranged in two rows along mid-part only. G2: about half the length of G1, with bend about two-thirds length at level of small setiferous area; flagellum rather long, curved, flattened, bladelike. DESCRIPTION (FEMALE) Chelipeds weakly dimorphic (versus dimorphic in males), having almost cutters on both sides. On both chelipeds: inner surface markedly dished on half posterior part of propodus and on fixed finger; thick patches of dense setae extending on half or anterior two-thirds part of propodus and along occluding margins of dactyli. Dark colour extending on about threequarters of fixed finger and on two-thirds of dactylus of both crusher and cutter. Weak heterochely and heterodonty; cutter however smaller than crusher. Crusher: palm hardly inflated, elongated, smooth, without depressions; fingers thick, not or only slightly gaping at the occluding margins; two tiny blunt teeth on occluding margin of dactylus; two tooth and a few smaller ones on occluding margin of fixed finger.Cutter: palm similar to crusher but fingers more elongated, not gaping at occluding margins; palm smooth, without depressions; both fingers; dactylus elongate, hollowed, with occluding margin practically smooth; fixed finger very thick, with occluding margin nearly straight, bearing small teeth, two being more marked. P2-P5 with felt of short, stiff setae, mixed with numerous longer setae. Median line along sternite 8, hardly continuying along sternite 7. Dense patches of setae on thoracic sternum near junction of sternite 4 with pterygostome. No pleonal locking mechanism in mature females. Margins of pleon densely fringed with setae. Vulvae large, rounded, with thick membranous area all around median opening. REMARKS AND COMPARATIVE DIAGNOSIS The two characteristic depressions on the propodus of both male chelae, crusher and cutter, of Austinograea hourdezi n. sp. (Figs 3A; 4A, B; 5E, G), typically absent in females (Fig. 7E, G), are similarly located in all the individuals examined, but they are variously delineated by a raised margin and thus may appear quite deep or shallower but practically always coloured as dark or coloured spots, always with a different texture and colour but commonly referred to as “dark spots”. The function of the pigmented pits or spots present on the palm of chelipeds (also on the subocular regions in others species) of certain bythograeids is supposed to be sensory. For atypical specimens of A. hourdezi n. sp., see below Individuals with regenerated chelae. Austinograea hourdezi n. sp. may be easily distinguished from A. alayseae (Fig. 8A, B), with which it cohabits in several sites, by: 1) subhepatic region covered by patch of dense setae in both sexes (no setae in A. alayseae); 2) mxp3: external border oblique, distal end strongly produced (in A. alayseae forming a marked angle:proximal portion vertically oriented, with slightly concave border, half distal portion abruptly tilted; distal end weakly produced); inner margin produced in marked lobe (without lobe in A. alayseae); 3) both male chelae with two deep, dark depressions, marked as spots (without any spot in A. alayseae); 4) in both sexes patches of dense setae on inner surface of palm and along fingers (without setae in A. alayseae); 5) marked heterochely: male crusher with short, stout propodus, and short, thick fingers; 6) fixed finger coloured; dactylus coloured on two thirds (in A. alayseae pronounced heterochely but propodus of male crusher more elongated; fingers more elongated, narrower); 7) male cutter with occluding margin of dactylus smooth; 8) fixed finger very thick, almost entirely coloured, occluding margin with three small teeth, size progressively diminishing forwards (in A. alayseae fingers elongated, armed on both occluding margins with several small teeth interspersed with smaller ones; dactylus coloured at distal end in males and only at tip in females); 9) thoracic sternum with median line at level of sternite 8 and practically not continuying along sternite 7 in both sexes (extending on most part of sternite 7 in both sexes of A. alayseae, see Guinot 1990: fig. 2C); 10) male pleon with triangular telson (rounded in A. alayseae); and 11) G1 rather straigt, with only minute setae along subdistal half (more curved, with several rows of rather long, acute setae along most of length in A. alayseae). The most distinctive character between Austinograea hourdezi n. sp. and A. williamsi is in the presence of a two spots in male chelae of A. hourdezi n. sp. (Figs 3A; 4A, B; 5E, G) ([versus one spot on the palm of crusher and cutter male chelipeds of A. williamsi, described by Hessler & Martin (1989: 651, figs 1b, 9a-c) as “small, often brown-stained, pitted area just proximal to, and in line with, ventral border of dactylus” in “larger males” and absent in females (see also Tsuchida & Fujikura 2000: fig. 2]). Heterochely and heterodonty are pronounced in males of A. hourdezi n. sp. and A. williamsi. The male cutter chela of A. hourdezi n. sp. has a thick, broad fixed finger, and an occluding margin armed with a few teeth. In A. williamsi the cutter chela is more elongate; the fixed finger is more inflated and broader, with a deeply dished inner surface, and a markedly convex, much toothed occluding margin that fits flush against dactylus. In A. hourdezi n. sp. the chelae show a sexual dimorphism that is distinctive from that of A. williamsi (see Hessler & Martin 1989: figs 9, 10), in which females have cutters for both chelipeds with a markedly concave propodal inner margin and a well dished fixed finger at occluding margin that bears numerous, sharper, delicate teeth. The mxp3 merus of A. hourdezi n. sp. is very similar to that of A. williamsi, both having an oblique external border, a produced ending and a pronounced inner lobe. Another marked difference is the subhepatic region: covered by dense setae in A. hourdezi n. sp., whereas the patch of setae is much more larger in A. williamsi, in which it considerably extends below the lateral line. For the distinction between A. alayseae and A. williamsi, see the comparative illustrations in Tsuchida & Hashimoto (2002). The inner surface of palm and most inner surface of the dactylus of the two chelae bear patches of setae in both sexes of A. hourdezi n. sp. (Figs 3 A-C; 5A, F, H; 7A, B, F, H), as in A. williamsi, whereas in both sexes of A. alayseae the chelae of both sides are glabrous on palm and dactylus. The G1 and G2 of A. hourdezi n. sp. and A. williamsi (in which the G2 is about less than half the G1’s length) are similar, whereas in A. alayseae the G1 bears numerous long setae scattered over its entire length. DISTINCTION OF FEMALES As the spots on the cheliped propodus are typically absent in female A. hourdezi n. sp. and in both sexes of A. alayseae, the more useful significant character to differentiate the females of the two species is the patch of setae at the inner surface of the palm of females of A. hourdezi n. sp. (Fig. 7A, B, F, H), as in the males (Figs 3A; 5A, F, H). In contrast, in A. alayseae (Fig. 8A, B) the chelae are devoid of setae, in females as in males. The same character allows identification of females of A. williamsi, with setose patch at the inner chela surface (Hessler & Martin 1989: fig. 10), from females of A. alayseae, which have glabrous chelae. See the comparative illustration of female Austinograea chelae by Tsuchida & Hashimoto (2002: fig. 6), which does not show any spot in A. williamsi and A. alayseae, in contrast with A. rodriguezensis, which is shown bearing a spot, as in the males. In A. alayseae a thick posterior membrane may cover most of the vulva, leaving a variously developed opening, sometimes only a lateral slit, whereas in A. hourdezi n. sp. the medial opening is entirely surrounded by thick membrane (Fig. 7D). INDIVIDUALS WITH REGENERATED CHELAE A few male specimens that display most characters of A. hourdezi n. sp. (including mxp3 shape and patches of setae on inner surface of chelae) exhibit a single spot on the outer surface chelae palm, instead of two. The holotype (MNHN- IU-2016-10737), from the Lau Basin, Tow Cam site, a large right-handed male 25.7 × 40.2 mm, typically bears the two characteristic spots on each chela (Fig. 4A, B), such as most of other males that we have examined. Although left-handed and with weak heterochely and heterodonty, a larger male from the same site 29.8 × 48.1 mm, paratype, MNHN- IU-2016-10738, also shows the two typical spots on chelae, even on regenerated cheliped (Fig. 5E, G). But a smaller lefthanded male 24.7 × 36.0 mm, from the same sample, has an obviously regenerated minor chela that bears only one spot; its left chela, having become the major chela, shows the two typical spots. Two samples of female A. hourdezi n. sp., instead of being devoid of any spot on the chela, bear a spot on both chelae: they are left-handed, which means that one chela was regenerated. These females that bear a spot on each cheliped, crusher and cutter, are: MNHN-IU- 2016-10744, 1 ♀ 27.1 × 44.6 mm (left-handed), Lau Back-Arc Basin, Lau Basin 2009 cruise, dive 427, ABE site, 20°45.65’S, 176°11.45’W, 2130 m, 28.V.2009 (preserved in ethanol 85%). It belongs to the same sample that contains two typical females devoid of spots on chelae palm; MNHN-IU- 2016-10768 (= MNHN-B27834), 1♀ 22.7 × 36.5 mm, North Fiji Basin, STARMER II cruise, dive PL 18, Mussel Valley, 18°50’S, 173°29’E, 2750 m, 13.VII.1989 (was found with a typical male of A. alayseae). A large, right-handed ♀ 30.0 × 48.5 mm (MNHN- IU-2016-10752) from the Lau Back-Arc Basin, MGLN07MV cruise, dive 230, Kilo Moana site, 20°03.23’S, 176°08.01’W, 2623 m, 07.IX.2006, and identified as A. hourdezi n. sp. on the basis of other characters, has the right chela of a crusher type with one marked spot plus a second spot only as a yellow trace, and the cutter with two yellowish spots (Fig. 4D, E), This male chela pattern is unusual for female A. hourdezi n. sp., which are generally devoid of any spot (Fig. 7E, G). A bythograeid that bears only a left cheliped, photographed in situ (Fig. 8C) at the site Kilo Moana during the Lau Basin 2009 cruise and with a single dark spot on the chela could be A. hourdezi n. sp., based on the patches of setae discernible just at the suface of the inner chela palm and on setose patches on the right subhepatic region. This could be an atypical specimen of A. hourdezi n. sp., with a regenerated cheliped. It was found associated with mussels Bathymodiolus brevior Cosel, Métivier & Hashimoto, 1994 (see Cosel et al. 1994), gastropods Ifremeria nautilei Bouchet & Warén, 1991, sea anemone Cyananthea hourdezi Zelnio, Rodríguez & Daly, 2009 (see Zelnio et al. 2009; E. Rodríguez, pers. comm. 2017). Due to the same features, the seemingly right-handed crab collected at Tow Cam site, dive 240, and photographed in situ (Zelnio et al. 2009: fig. 14B) associated with an unidentifiable actiniarian zoanthidean, could be also identified to A. hourdezi n. sp., but it is difficult to discern the presence of spots on the chelae. All of these specimens with atypical spot(s) on the chelae exhibit all other morphological traits of A. hourdezi n. sp., and are not A. williamsi nor A. rodriguezensis, both of which are characterised by one spot on the outer chela palm, near the dactylus base. We assume that most of these atypical crabs were initially right-handed and that left-handers represent individuals
FIGURE 8. Munidopsis laurentae n in Species of the genus Munidopsis (Crustacea, Decapoda, Galatheidae) from the deep Atlantic Ocean, including cold-seep and hydrothermal vent areas
No full textFIGURE 8. Munidopsis laurentae n. sp., holotype, female (24.7 mm), off South Africa, WALVIS, Stn 13, MNHNGa 5295. A, carapace, dorsal. B, same, lateral. C, sternal plastron. D, posterior part of sixth abdominal segment and telson. E, left antennule, antenna and ocular peduncle, ventral. F, endopod of right third maxilliped, lateral. G, right cheliped, lateral. H, right second pereiopod, lateral. I, dactylus of right second pereiopod, lateral. Scale: A–B, D, G–H = 5 mm, C–F, I = 2 mm.Published as part of Macpherson, Enrique & Segonzac, Michel, 2005, Species of the genus Munidopsis (Crustacea, Decapoda, Galatheidae) from the deep Atlantic Ocean, including cold-seep and hydrothermal vent areas, pp. 1-60 in Zootaxa 1095 (1) on page 32, DOI: 10.11646/zootaxa.1095.1.1, http://zenodo.org/record/505135
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