74 research outputs found
Découverte de Bitias brevis (Rathbun, 1906) à Madagascar (Decapoda, Pandalidae)
No full text#Pandalus brevis Rathbun, 1906, décrit des îles Hawaii et qui n'avait jamais été retrouvé, est découvert à Madagascar et redécrit. L'examen du type de Rathbun montre que cette espèce appartient au genre #Bitias Fransen, 1990, qui, avec #B. stocki$ Fransen, 1990, comprend donc maintenant deux espèces qui sont comparées. (Résumé d'auteur
Caribbean Bryozoa: Anasca and Ascophora Imperfecta of the inner bays of Curaçao and Bonaire
No full textThe present paper deals with the Anasca and Ascophora Imperfecta of the inland bays of Curaçao and Bonaire. Collections were made by P. WAGENAAR HUMMELINCK (1930, 1936/ 37, 1948/49, 1955, 1963/64, 1968, 1970, and 1973) and by the author (1982), and stored in the collections of the Rijksmuseum van Natuurlijke Historie, Leiden. A total of 25 species – almost all occurring in inland bays – are described here and fully illustrated. Six new species are established: Crassimarginatella harmeri. Scrupocellaria curacaoensis, Scrupocellaria carmabi, Scrupocellaria piscaderaensis, Scrupocellaria hildae and Bugula hummelincki. Attention is given to the ecology of the species. The bays have been compared as to species composition in relation to substrate and conditions during collecting
Palaemonella rubrolineata Fransen & Veer & Frolová 2022, sp. nov.
No full textPalaemonella rubrolineata sp. nov. (Figs. 1–8) Palaemonella spec.: Frolová et al., in prep.. Material examined. MZB Cru 5448: 1 ovigerous female holotype, pocl. 2.2mm; stn RAJ.41, Indonesia, Raja Ampat Islands, West Papua, SE Gam, Desa Besir, 00°27.802′S, 130°41.243′E, 2.xii.2007, depth 5 m, on Pocillopora damicornis, collected by C.H.J.M. Fransen, CF142. Paratypes. RMNH.CRUS.D. 53070: 2 ovigerous females, pocl. 2.1–2.2mm; 1 male, pocl. 1.5mm; same locality as holotype, GenBank accession nrs. OP306073 (COI); OP304831 (16S). RMNH.CRUS.D. 48816: 2 ovigerous females, pocl. 1.6 and 1.8mm; 2 non-ovigerous females with abdominal bopyroid, pocl. 1.5mm; 4 males, one with bopyroids on abdomen and antennula, pocl. 0.8–1.6mm; stn MAL.15, Indonesia, Moluccas, Ambon, Ambon bay, S coast, cape W of Amahusu, 03°44′S 128°08′E, 16.xi.1996, depth ca. 15 m, scuba diving, on Seriatopora hystrix, collected by C.H.J.M. Fransen. RMNH.CRUS.D. 53067: 1 male pocl. 2.2mm, 1 juvenile pocl. 1.6mm; stn RAJ.02, Indonesia, Raja Ampat Islands, West Papua, E Kri Island, Sorido resort lagoon, near jetty, 00°33.347′S 130°41.225′E, 19.xi.2007, depth unknown, on Seriatopora hystrix; collected by E. van der Veer, GenBank accession no. OP326597 (16S), photo C.H.J.M. Fransen. RMNH.CRUS.D. 53068: 1 ovigerous female (rostrum broken, P2–5 missing), pocl. 1.8mm; stn RAJ.49, Indonesia, Raja Ampat Islands, West Papua, NW off Mansuar I., Lalosi reef, 00°32.892′S 130°29.852′E, 6.xii.2007, depth unknown, on Seriatopora hystrix, collected by E. van der Veer, GenBank accession no. OP326598 (16S), photo C.H.J.M. Fransen. MNHN-IU- 2014- 22476: 1 ovigerous female, pocl. 1.9mm; stn FR18, Vanuatu, Santo, NW Tutuba Island, 15°19′47.892″S 167°10′1.128″E, 18.ix.2006, depth unknown, steep reef slope, collected by C.H.J.M. Fransen, GenBank accession no. OP326599 (16S). Description. Small slender shrimp of slightly compressed body form. Carapace (Fig. 1A) smooth, slightly swollen posteriorly; orbit obsolescent; inferior orbital angle slightly produced; antennal spine long, slender, acute and marginal, reaching distal margin of basicerite; hepatic spine distinct, slightly shorter than antennal spine, located distinctly lower than antennal spine; anterolateral angle rounded, not produced. Rostrum (Fig. 1A–C) well developed, straight, horizontal, reaching distal margin of scaphocerite, with 6 or 7 acute dorsal teeth, of which 0–2 small and subdistal, slightly separated from proximal teeth, proximalmost tooth postorbital, second tooth at level of orbit; ventral margin with single row of short setae, with single acute tooth at level of distal margin of intermediate segment of antennular peduncle. Abdomen (Fig. 8A, B) normal, third tergite not produced, sixth segment (Fig. 1D) about 1.9 times length of fifth, 1.3 times longer than deep, with posterolateral and posteroventral angles bluntly produced; pleura of first four segments enlarged, broadly rounded, fifth segment (Fig. 1D) with posterolateral tooth. Telson (Fig. 1E) about 1.4 times longer than sixth abdominal segment, 2.0 times longer than proximal width, lateral margins convergent, sublinear, with two pairs of small subequal dorsal spines at about 0.51 and 0.74 of telson length, distal margin (Fig. 1F) about 0.32 of proximal margin width, rounded, without median process, lateral spines small, similar to dorsal spines, intermediate spines robust, 4.6 times as long as lateral spines, submedian spines about half length of intermediate spines, setulose. Eye (Fig. 1A) with whitish globular cornea with red lines, with distinct accessory pigment spot dorsally; cornea almost as wide as maximum width of eyestalk; eyestalk 1.2 times longer than maximum width. Antennula (Fig. 2A) normal; basal segment of antennular peduncle about half as long as scaphocerite, with acute ventromedial tooth, distal margin convex, with plumose setae, distolateral tooth reaching halfway intermediate segment, lateral margin slightly convex, medial margin straight with row of plumose setae, statocyst normal; stylocerite slender, acute, reaching to half segment length; intermediate and distal segments subequal in length, together about 0.5 of basal segment length; flagella long, slender, upper flagellum biramous, proximal 8–16 segments fused (usually 9–10), shorter free ramus with 3 segments, with 5–10 groups of aesthetascs, longer free ramus slender. Antenna (Fig. 2B) normal; basicerite armed with short acute distolateral spine; ischiocerite and merocerite normal; carpocerite subcylindrical, reaching to about 0.25 of scaphocerite length; flagellum well developed; scaphocerite extending well beyond antennular peduncle, 4 times longer than maximum width, distal margin rather small, broadly rounded, lateral margin concave with acute distolateral tooth exceeding distal margin of lamina. Epistome and labrum normal. Fourth thoracic sternite (Fig. 1G) with strong, broad, blunt, median process. Fifth thoracic sternite (Fig. 1G) with shallow lateral plates posteromedial of second pereiopods with acute triangular submedian processes. Sixth to eight thoracic sternites unarmed, increasing in width posteriorly. Mandible (Fig. 3A) robust, with small unsegmented palp with few small simple setae; molar process stout with large angular teeth and brushes of stout setae; incisor process also stout with three large acute distal teeth. Maxillula (Fig. 3B) with upper lacinia slender, with two rows of robust simple and serrulate spines medially; lower lacinia slender, setose distally; palp distinctly bilobed, upper lobe with single small simple seta, lower lobe with a small, ventral, single, short, recurved seta. Maxilla (Fig. 3C) with basal endite well developed, distinctly bilobed; distal and proximal lacinia equal in length, both fringed medially by many long simple setae, median border without setae; coxal endite obsolete, median margin straight, without setae; scaphognathite about twice as long as proximal width; palp well developed, basally broad, tapering distally, indistinctly two-segmented, with few plumose setae on lateral border. First maxilliped (Fig. 4A) with basal and coxal endites distinct; basal endite broad, anterolateral border sparsely setose, medial margin straight, with numerous slender simple and serrulate setae; coxal endite medially biconvex, sparsely setose; exopod well developed, flagellum with about 6 plumose setae distally, caridean lobe small, narrow; coxa with very large bilobed exopod, anterior lobe slightly larger than posterior lobe; palp tapering distally with one large plumose seta subdistally on medial border. Second maxilliped (Fig. 4B) with endopod normally developed; with dactylar segment narrow, 4 times longer than broad, densely fringed with numerous coarsely serrulate, spiniform, and long curled, finely serrulate setae medially; distomedial lobe of propodal segment slightly produced, rounded, with row of long slender simple and serrulate setae, ventrolateral margin devoid of setae; carpal segment distomedially angular, without setae, unarmed; meral segment medially excavate, without setae; basal and ischial segments fused, both segments medially excavate, with few short setae medially; exopod normal, with long plumose setae distally; coxal segment slightly produced medially, with few long setae; epipod small, simple, subrectangular, without podobranch. Third maxilliped (Fig. 4C) with endopod slender, reaching with terminal segment beyond carpocerite; ischiomerus and basis distinct, ischiomerus almost 5 times longer than wide, flattened and twisted, setose medially, otherwise glabrous, with 3 robust spines in distal two thirds; carpal segment 5 times longer than wide, 0.90 of ischiomeral length, subcylindrical, with groups of long serrulate setae medially; terminal segment 0.55 of ischiomeral segment, tapering distally with terminal spine, medial margin with groups of short serrulate setae; basis with few simple setae along slightly convex median margin; exopod well developed, reaching distal margin of ischiomerus, with numerous plumose setae distally; coxa with small medial lobe and rounded epipod laterally. First pereiopods (Fig. 5A) slender, exceeding carpocerite with distal part merus, carpus and chela; chela (Fig. 5B) normal, slightly compressed, palm twice as long as deep, with several rows of cleaning setae proximoventrally, fingers about as long as palm, slender, tapering, both with brushes of simple setae and hooked tip distally, cutting edges simple, entire; carpus 1.5 times chela length, slender, 6 times longer than distal width, tapering slightly proximally, with several cleaning setae distoventrally; merus about as long as carpus, about 7 times longer than wide; ischium and basis with several long simple setae medially; coxa with small setose ventromedial lobe. Second pereiopods (Fig. 5C, E) equal and similar; chela about 2.6 times carapace length, palm smooth about 3.3 times longer than deep, slightly swollen proximally, fingers (Fig. 5D, F) 0.6 times palm length, slender, dactylus about 5.4 times longer than proximal depth, dorsal margin slightly convex, tip hooked, acute, cutting edge with 2 teeth in proximal half, distal cutting edge entire; fixed finger similar, with 1 large tooth at level between two dactylar teeth and 3 small teeth proximally; carpus about 0.4 of chela length, about 5 times longer than distal width, tapering proximally, constricted then flared distally with blunt angular dorsal lobe; merus slightly longer than carpus, 6.4 times longer than central width, armed with distomesial tooth; ischium about 0.5 length of merus, tapering proximally; basis and coxa without special features. Third pereiopods (Fig. 6A) slender, exceeding carpocerite by carpus, propodus and dactylus; dactylus (Fig. 6B) simple, slightly curved, 0.18 of propodus length, 3.6 times longer than proximal depth, corpus 2.6 times longer than proximal width, distal width 0.36 times proximal width, dorsal margin convex, with 3–4 simple setae at about 0.65 of length, ventral margin proximally slightly convex, distally concave, armed, with minute distal accessory tooth, without setae; unguis indistinctly demarcated, 0.42 of corpus length, simple, curved, distally acute; propodus about 13 times longer than wide, slightly compressed, straight, uniform, with many long slender setae distally, with one distoventral spine and two similar spines in distal third; carpus normal, about almost half propodus length, unarmed; merus as long as propodus, 9.3 times longer than wide, uniform, unarmed; ischium, basis and coxa without special features. Fourth pereiopods (Fig. 6C, D) similar to third, slightly longer. Fifth pereiopods (Fig. 7A, B) similar to fourth, slightly longer, propodus with one subdistal ventral spine, few rows of serrulate setae distoventrally. Uropods (Fig. 1E) extending beyond telson; protopodite robust, unarmed; exopod with lateral margin straight, non-setose, with small acute posterolateral tooth, flanked medially by mobile spine twice as long as posterolaterlal tooth; endopod slightly shorter than exopod. Pleopods with endopods shorter than exopods. Ova about 50, size 0.38mm. First pleopod of female with endopod almost half as long as exopod, with long plumose setae medially and distally. Male endopod of first pleopod (Fig. 7C) half as long as exopod, about 3.5 times longer than wide, with median margin concave, distally slightly expanded, with relatively short plumose marginal setae. Endopod of second pleopod (Fig. 7D) 0.8 times length of exopod; appendix masculina well developed, with several rows of strong serrulate setae, just falling short of appendix interna. Size. Maximal pocl. in males 1.6mm, in ovigerous females 2.2mm. Coloration (Fig. 8). Body and appendages translucent with reddish tinge. Thorax and abdomen with few yellow spots and small white chromatophores. Eyestalks with red longitudinal lines and few white chromatophores anteriorly. Red spots at base of uropods and at joints of pereiopods. Cutting edges of second pereiopod chela red. Host. Scleractinia: Pocilloporidae: Pocillopora damicornis (Linnaeus, 1758) and Seriatopora hystrix Dana, 1846. Distribution. The species has been recorded from Ambon and Raja Ampat, Indonesia and Santo, Vanuatu. Etymology. Named after the red stripes on the cutting edges of the chelae and on the eyestalks combining the Latin word ‘ruber’ = red and ‘lineatus’ = stripes. Remarks. The new species is most closely related to P. orientalis (see Frolová et al., in prep.). A unique feature both species share is the wreath of long setae at the distal part of the ambulatory propodi (Figs. 6A–D, 7A, B, 14A–D, 15A, B). The new species differs from P. orientalis in: 1) the presence of a hepatic spine (Fig. 1A) which is absent in P. orientalis (Fig. 9A); 2) the more slender body and longer appendages (Fig. 8) than in P. orientalis (Fig. 16A); 3) the more slender rostrum (Fig. 1A–C) than in P. orientalis (Fig. 9A–C); 4) the pleura of the fifth abdominal segment having a posterolateral tooth (Fig. 1D) while it is broadly rounded in P. orientalis (Fig. 9D); 5) having the fingers of the first pereiopods without rows of long serrate setae distally (Fig. 5B) whereas these are present in P. orientalis (Fig. 13A); 6) having the cutting edges of the second chela as well as the joints of the pereiopods dark red coloured (Fig. 8A, B) while these are translucent in P. orientalis (Fig. 16A).Published as part of Fransen, Charles H. J. M., Veer, Eva Van Der & Frolová, Pavlína, 2022, A new species of scleractinian associated shrimp of the genus Palaemonella (Crustacea, Decapoda, Palaemonidae) with a redescription of Palaemonella orientalis Dana, 1852, pp. 557-580 in Zootaxa 5214 (4) on pages 558-568, DOI: 10.11646/zootaxa.5214.4.5, http://zenodo.org/record/739776
A new species of Pygocephalomorpha (Eumalacostraca, Peracarida) from the Leitchfield Formation, Lower Carboniferous (Mississippian) of Grayson County, Kentucky, U.S.A.
No full textWe describe a new species of pygocephalomorph eumalacostracan from the Leitchfield Formation, Mississippian (Lower Carboniferous) of Kentucky, U.S.A. The fossils display a well-developed cephalothorax, pleon, and tail fan, and they show greatest affinity with other species within Tealliocarididae, especially to species of Pseudotealliocaris. The new species, Pseudotealliocaris holthuisi, is a second taxon of tealliocarid from the American Lower Carboniferous, the other being P. palinscari from the Mississippian of Pennsylvania. We compare the new species to other known species in the family and provide an overview of pygocephalomorph evolution
Bitias stocki, a new genus and new species of pandalid shrimp (Crustacea, Decapoda, Caridea) in the Eastern Atlantic Ocean
No full textA new genus and species of Pandalidae, Bitias stocki, is described and figured. The species was found near the Azores and the Cape Verde Islands in water between 1100 and 1350 m depth
Poripontonia dux gen. nov., spec. nov., a sponge associated shrimp (Crustacea, Decapoda, Caridea, Palaemonidae, Pontoniinae) from Indonesia
No full textA new genus and species of sponge associated shrimp from Indonesia is described and depicted. The systematic position of the new genus is discussed
Hamodactylus macrophthalmus Fransen & Rauch, 2013, spec. nov.
No full text<i>Hamodactylus macrophthalmus</i> spec. nov. <p>(figs. 1–4)</p> <p> <b>Material examined.</b> 1 ovigerous female holotype (pocl. 1.5 mm) RMNH.CRUS.D.55048, stn LEM.23, Indonesia, N Sulawesi, Lembeh Strait, Tanjung Kuning, 1º23'10.788"N 125º10'23.2314"E, 11.ii.2012, depth 23.4 m, on <i>Herpolitha limax</i> (Esper, 1797), collected by C. Rauch, field collection number S.172.</p> <p> <b>Comparative material examined.</b> <i>Hamodactylus aqabai</i> Bruce & Svoboda, 1983: 1 ovigerous female holotype (pocl. 2.5 mm), RMNH.CRUS.D.33233, Aqaba, Jordan, depth 6 m, 24.ii.1976, on <i>Litophyton arboreum</i> Forskål, 1775, collected by A. Svoboda (no. 2398). 1 ovigerous female (pocl. 2.2 mm) RMNH.CRUS.D.53969, stn SEM.09b, Malaysia, Semporna area, Ligitan reef N2, 04º14'57.5"N 118º37'54.0"E, depth 10 m, 1.xii.2010, on nephtheid alcyonarian, collected by Nina Ho. <i>Hamodactylus boschmai</i> Holthuis, 1952: 1 ovigerous female (pocl. 1.8) syntype, RMNH.CRUS.D.8999, Snellius Expedition, Indonesia, Ternate, depth 2–4 m, 6.vi.1930, divinghood. 1 ovigerous female (pocl. 3.1 mm), RMNH.CRUS.D.53786, stn SEM.47, Malaysia, Semporna area, Larapan Isl., 04º34'27.5"N 118º36'15.0"E, depth 18 m, 13.xii.2010, on red gorgonarian, collected by Bastian T. Reijnen. 1 female (pocl. 3.1 mm), RMNH.CRUS.D.53814, stn SEM.47, Malaysia, Semporna area, Larapan Isl., 04º34'27.5"N 118º36'15.0"E, depth 20 m, 13.xii.2010, on <i>Ellisella</i> spec., collected by C.H.J.M. Fransen. 1 female (pocl. 1.0 mm), RMNH.CRUS.D.53831, stn SEM.09, Malaysia, Semporna area, Ligitan Reef 1 S / Yoshi Point, 04º14'05.8"N 118º33'26.7"E, depth 20 m, 1.xii.2010, on red melitheid, collected by Bastian T. Reijnen. <i>Hamodactylus noumeae</i> Bruce, 1970: 1 ovigerous female (pocl. 2.2 mm), RMNH.CRUS.D.53812, stn SEM.20, Malaysia, Semporna area, Creach Reef, 04º18'58.8"N 118º36'17.3"E, depth 5 m, 5.xii.2010, on <i>Ellisella</i> spec., collected by Nina Ho.</p> <p> <b>Description.</b> Very small sized, rather slender pontoniine shrimp (fig. 1A), with slender pereiopods.</p> <p>Carapace smooth (fig. 1A). Rostrum short (fig. 1B), reaching to middle of basal segment of antennular peduncle; lamina deep, lateral carina indistinct, ventral margin slightly convex, toothless, proximally setose; dorsal margin convex, elevated, strongly compressed, with four subequal teeth, of which first situated above level of posterior margin of orbit. Supra-orbital and epi-gastric spines absent. Orbit obsolescent. Inferior orbital angle feebly produced, rounded in lateral view. Antennal tooth of moderate size, submarginal, situated below inferior orbital angle. Hepatic tooth as large as antennal tooth, situated well behind level of posterior orbital margin and slightly above level of antennal tooth. Antero-lateral angle of carapace blunt, not produced.</p> <p>Abdominal segments smooth (fig. 1A). Third segment not produced posterodorsally. Pleura all broadly rounded. Posteroventral angle of sixth segment feebly produced, posterolateral angle feebly acute.</p> <p>Telson 0.9 of length of sixth abdominal segment and 2.4 times longer than maximum width (fig. 1D); lateral margins converge posteriorly; two pairs of moderately sized submarginal dorsal spines present at 0.45 and 0.70 of telson length; posterior margin rounded, about half of anterior width, with three pairs of spines. Lateral spines short, about as long as dorsal spines. Intermediate spines about 0.13 of telson length, 1.3 times length of submedian spines.</p> <p>Eyes twice as long as rostrum (fig. 1B, C). Cornea globular, obliquely set on stalks, with distinct accessory pigment spot posterodorsally. Eyestalks slightly more than twice as long as proximal width, slightly swollen proximally.</p> <p>Antennular peduncle normal (fig. 1B, C), exceeding tip of rostrum by half length of proximal segment. Proximal segment long, slender, 2.8 times longer than wide; stylocerite slender, acute, reaching almost to middle of segment; disto-lateral margin straight, anterolateral margin slightly produced, with one distolateral tooth and row of setae; medial ventral margin with distinct acute tooth just before mid length of segment. Statocyst normally developed containing a granular statolith. Intermediate and distal segments short, together equal to 0.36 of proximal segment length. Upper flagellum biramous, with first 4–6 segments fused. Shorter free ramus unisegmented, longer rami incomplete. Few aesthetascs present. Lower flagellum slender.</p> <p>Antennal basicerite (fig. 1B, C) without lateral tooth. Ischiocerite and merocerite normal. Carpocerite slender, reaching to 2/3 of scaphocerite. Scaphocerite long, rather narrow, with lamella almost reaching distal margin of antennular peduncle. Lateral border broadly convex, ending in an acute distolateral tooth. Lamella extending far beyond distolateral tooth, feebly angulated distomedially, about 2.7 times longer than broad, with greatest width at about one third of its length.</p> <p>Fourth thoracic sternite unarmed.</p> <p>Mandible (fig. 2A, B) with cylindrical molar process bearing a few brushes of setae distally. Incisor process rather slender, with four teeth distally, of which lateralmost slightly enlarged. Mandible without palp.</p> <p>Maxillula lost during dissection.</p> <p>Maxilla (fig. 2C) with tapering non-setose palp. Basal endite simple, short, stout and blunt, with about six simple setae distally. Coxal endite obsolete medial region slightly convex. Scaphognathite normal, widest centrally, about 2.8 times longer than broad, with marginal plumose setae.</p> <p>First maxilliped (fig. 2D) with slender, tapering palp with one subdistal long seta. Basal region broad, not distinctly separated from coxal region. Median margin sparsely provided with setulose and slender simple setae. Caridean lobe distinct, with coarsely setulose plumose marginal setae. Flagellum of exopod well developed, with 4 long plumose terminal setae. Epipod small, indistinctly bilobed.</p> <p>Second maxilliped (fig. 3A) with broadly triangular dactylar segment, about 3 times broader than long, slightly convex medially, bearing row of stout biserrulate spines. Propodal segment broader than dactylar segment, with subrectangular distomedial angle with few long serrulate setae. Carpus short. Merus partly fused to ischium. Ischium completely fused to basis. Basis without exopod. Coxa not produced medially, with small, rounded epipod laterally.</p> <p>Third maxilliped (fig. 3B) with slender antepenultimate segment, about 5 times longer than proximal width. Basis completely fused with ischiomerus, junction indicated medially by small knob. Median margin of antepenultimate segment with few simple setae. Penultimate segment slender, 4.5 times longer than wide, 0.44 of length of antepenultimate segment, with few long slender setulose setae on medial border. Terminal segment 4.3 times longer than wide, slightly shorter than penultimate segment, with few serrulate and simple setae medially distally. Exopod absent. Coxa feebly produced medially, with rounded lateral lobe. Multilamellar arthrobranch present laterally.</p> <p>First pereiopod slender (figs. 3C, 4A), reaching to end of scaphocerite. Chela with palm subcylindrical, slightly bowed, about 3.2 times longer than wide. Fingers 0.58 of palm length, feebly subspatulate with brushes of few setae in distal part. Cutting edges with very thin denticulate lamella laterally in distal 2/3. Tip of dactylus with distinct tooth. Cleaning setae present proximally on palm and distoventral end of carpus. Carpus 1.2 times length of chela, 5.5 times longer than wide. Merus 1.12 times longer than carpus and twice length of ischium. Coxa with very small medial setose process.</p> <p>Second pereiopods (figs. 3D, 4B) greatly reduced, subequal and similar, only extending slightly beyond carpocerite. Chela atyid-like, with blunt fingers with brushes of distal curled setae, cutting edges not developed. Dactylus distinctly shorter than fixed finger, unguis not developed. Palm subcylindrical, 2.5 times longer than dactylus, 3.8 times longer than wide, unarmed. Carpus, merus and ischium also unarmed, their lengths ratio of 1.3, 1.8 and 1.5 times length of palm. Basis and coxa without special features.</p> <p>Ambulatory pereiopods (fig. 4C, D) slender, similar, increasing in length from third to fifth. Dactylus slender, uniformly tapering, unarmed, with distinct slender unguis. Total length about five times width near base. Propodus about 9 times longer than wide, 3.6 times length of dactylus, devoid of spines. Carpus, merus and ischium 0.55, 1.1 and 0.65 of propodus length, unarmed.</p> <p>Pleopods well developed. Marginal plumose setae of exopod and endopod coarsely serrulate.</p> <p>Uropods (fig. 1D) slender just extending beyond tip of telson. Protopodite unarmed laterally. Exopod about 2.3 times longer than wide, about as long as endopod, with lateral border almost straight, entire, terminating in tooth with small mobile spine medially.</p> <p>About 30 eggs of ca. 0.5 mm in length present under abdomen.</p> <p> <b>Colouration.</b> Not recorded.</p> <p> <b>Etymology.</b> The specific name <i>macrophthalmus</i> is a noun composed of the prefix macro- (Gr. makros), = long, and the suffix –opthalmus (Gr. opthalmos), = eye, referring to the eyes with the long eyestalks.</p> <p> <b>Host.</b> <i>Herpolitha limax</i> (Esper, 1797) (Scleractinia), identification confirmed by B.W. Hoeksema, Naturalis Biodiversity Center. The three previously known species of <i>Hamodactylus</i> have all been recorded as associated with Octocorallia. The closely related <i>Hamodactyloides incompletus</i> is only known from species of the hydrocoral <i>Millepora</i> (see Bruce 1976, 1978, 1981, 1983; Fujino 1973 (as <i>Hamodactyloides ishigakiensis</i>)). The new species is the first species of the genus <i>Hamodactylus</i> recorded in association with a scleractinian coral.</p>Published as part of <i>Fransen, Charles H. J. M. & Rauch, Cessa, 2013, Hamodactylus macrophthalmus spec. nov., a new coral-associated pontoniine shrimp (Decapoda, Caridea, Palaemonidae) from Indonesia, pp. 286-296 in Zootaxa 3635 (3)</i> on pages 288-293, DOI: 10.11646/zootaxa.3635.3.8, <a href="http://zenodo.org/record/222864">http://zenodo.org/record/222864</a>
Odontonia kerangcaris Fransen & Groenhof & Gier 2021, sp. nov.
No full textOdontonia kerangcaris sp. nov. (Figs. 1–8) urn:lsid:zoobank.org:act: 197FDE7A-BDDD-4162-8412-FEC59D128460 Material examined. Holotype male, pocl. 2.1mm, MZB 5341, stn BER.39, Indonesia, NE Kalimantan, Berau Islands, Baliktaba reef, SW-side (N of Panjang Isl.), 02˚34’43.3”N 118˚00’48.2”E, 24.x.2003, depth 33m, SCUBA diving, in Chama lazarus Linnaeus, 1758, collected by C.H.J.M. Fransen. Diagnosis. Rostrum short, not overreaching antennular peduncle, without ventral tooth. Pterygostomial angle broadly rounded, slightly produced. Basal segment of antennular peduncle with strong, acute medioventral tooth, with distolateral tooth reaching distal margin of intermediate segment. Carpocerite just falling short of distal margin of lamina of scaphocerite; distolateral tooth of scaphocerite robust, 0.15 times length of lamina (incl. distolateral tooth), almost twice as long as distal lamina; incision between distolateral tooth and lamina rather deep. Dactylus of ambulatory pereiopods with acute distoventral accessory tooth, perpendicular to flexor margin; ventral margin of corpus with one rounded protuberance at 2/3rd and one rounded protuberance proximally, without denticles in between; unguis strongly curved, 0.5 times corpus length, with large scales distally on outer margin, gradually decreasing in size proximally. Telson with two pairs of submarginal dorsal spines at 0.3 and 0.7 of telson length; distal and proximal pair of spines of equal length, 0.14 times telson length. Description. Body (Fig. 1) subcylindrical, somewhat depressed. Carapace (Fig. 1) glabrous with a few scattered simple setae. Rostrum (Fig. 2A, B) well developed, without dorsal teeth, reaching half of distal segment of antennular peduncle, with broad, indistinct, shallow dorsal elevation over entire length and acute lateral carinae, with slightly concave ventral carina in distal part; distal end rounded in lateral view, without subdistal ventral tooth, with few distal setae, blunt in dorsal view, broadened at base. Inferior orbital angle (Fig. 2B) produced, directed inward. Antennal spine (Fig. 2B) blunt, protruding rounded process, not separated by notch from inferior orbital angle. Anterolateral margin straight, pterygostomial angle slightly produced, rounded. Abdomen (Fig. 1) smooth; sixth segment 1.3 times longer than fifth, 1.3 times broader than long, posteroventral angle rounded, posterolateral angle feebly produced, blunt; pleura of first five segments broadly rounded. Telson (Fig. 2C, D) almost twice as long as sixth abdominal segment, about twice as long as proximal width; lateral margins slightly convex, almost straight, convergent posteriorly; posterior border without median process; two pairs of submarginal dorsal spines at 0.3 and 0.7 of telson length; distal and proximal pair of spines of equal length, 0.14 times telson length; posterior margin (Fig. 2E) with three pairs of spines, lateral spines small, marginal, about 1/3 of length of intermediate spines; submedian spines slightly shorter than intermediate spines; both intermediate and submedian spines about as long as dorsal spines, but more slender. Eyestalk (Fig. 2A, B) short, about as long as broad, broader than diameter of hemispherical cornea. Antennula (Fig. 3A, B) with peduncle and flagella short. Basal segment 1.4 times as long as proximal width, with acute produced distolateral tooth reaching distal margin of intermediate segment, anterior margin oblique; ventromedial tooth large, acute, at midlength of basal segment, submarginal; stylocerite short, reaching halfway basal segment, tip acute, distolateral margin with 4 short plumose setae; statocyst with statolith present in proximal part. Intermediate segment short, slightly broader than long; distal segment broader than long. Upper flagellum short, biramous, with 3 segments fused; short free ramus one-segmented; longer free ramus 3-segmented. Lower flagellum with 5 segments. Antenna (Fig. 3C) with basicerite short, laterally unarmed, with large rounded antennal gland tubercle medially; ischiocerite and merocerite normal; carpocerite just falling short of distal margin of lamina of scaphocerite, slender, 3.7 times longer than distal width; flagellum about as long as post-orbital carapace length; scaphocerite with lamina twice as long as wide, anterior margin rounded, lateral margin broadly convex; distolateral tooth robust, 0.15 times length of lamina (incl. distolateral tooth), almost twice as long as distal lamina length, somewhat curved inward; incision between distolateral tooth and lamina rather deep. Epistome with blunt anterior median carina; labrum normal, oval. Paragnaths well developed, alae with broad transverse more or less rectangular distal lobes, and small rounded more or less triangular ventromesial lobes; corpus very short, with shallow median excavation, bordered laterally by non-setose, oblique, carinae. Second thoracic sternite with shallow indistinct rounded median elevation, without setae. Third thoracic sternite unarmed. Fourth thoracic sternite with low, medially notched, triangular plate formed by the fused lateral carinae. Fifth thoracic sternite with well-developed lateral plates with shallow central slit posteromedial to second pereiopod coxae; coxae almost against each other. Sixth to eighth thoracic sternites unarmed, broadening posteriorly. Mandible (Fig. 3D) with incisor process with 5 acute distal teeth, small denticles along medioventral margin absent; molar process robust with several blunt teeth, some fringed with setal brushes. Maxillula (Fig. 3E) with upper and lower lacinia rather small; distal lacinia rectangular with two rows of about 8 stout distal spines, almost devoid of setae; lower lacinia slender, triangular, with few short serrulate setae in distal part; palp feebly bilobed, large lobe with small ventral tubercle with single short recurved seta. Maxilla (Fig. 3F) with basal endite well developed, with distal lobe and proximal lobe distinct, each with one long, simple distal seta; coxal endite obsolete, medial margin convex, non-setose; scaphognathite of moderate size; palp simple, longer than basal endite, blunt distally, non-setose. First maxilliped (Fig. 3G) with coxal and basal endite partly fused, broad; basal endite fringed with scattered, rather short simple and finely serrulate setae along medial and distal margins; coxal endite convex, indistinctly separated from basal endite, with few simple setae medially; exopod well developed, flagellum with 4 long plumose setae distally; caridean lobe rather small, narrow; epipod bilobed; palp simple, rather short, non-setose. Second maxilliped (Fig. 4A) with endopod short, stout; dactylar segment 3.0 times broader than long, fringed with short, coarsely serrulate, spiniform, and longer curled, finely serrulate setae medially; propodal segment with row of robust spines and few simple setae along expanded distomedial margin; one seta in distal part of ventrolateral margin; carpal segment short, broader than long, unarmed; meral segment without setae; ischial and basal segment completely fused, medially somewhat excavate, without setae, basal part strongly convex medially; exopod long, with 4 long plumose setae distally; coxal segment medially slightly produced, with few short simple setae, with expanded epipod laterally. Third maxilliped (Fig. 4B) short; with ischiomerus partly fused to basis, not broadened, 2.3 times as long as broad, not tapered distally, somewhat flattened, with row of long simple setae along medial margin, lateral margin with few simple setae; basal segment medially convex with few long simple setae on medial margin; exopod well developed, reaching distal margin of ischiomerus, with 4 long plumose setae in distal part; coxal segment without medial process, with large lateral plate with one short simple seta laterally; without arthrobranch; ultimate and penultimate segments of equal length; penultimate segment as long as broad, somewhat flattened, with few long finely serrulate setae ventromedially; ultimate segment more slender, with groups of long coarsely serrulate setae ventromedially and distally. First pereiopod (Fig. 4C) stout, exceeding carpocerite with chela and half of carpus; chela 3.0 times longer than deep, slightly compressed; fingers as long as palm, cutting edges entire, with groups of serrulate setae, tips slightly hooked; cleaning organ absent; carpus 0.8 times length of chela, 2.4 times longer than distal width, tapering proximally, unarmed; merus as long as chela, 3.3 times longer than central width, somewhat curved, with few setae medially; ischium 0.5 times merus length, slightly expanded medially, with few setae medially; basis as long as ischium, with few setae medially; coxa with small ventral lobe with few short simple setae. Second pereiopods (Fig. 5A, B) subequal, similar. Major right chela (Fig. 5C) with palm slightly compressed, without carinae, with few scattered simple setae; fingers with simple setae; dactylus 0.6 of palm length, 3.2 times longer than deep, with one large triangular tooth at 1/3 of cutting edge, distal part of cutting edge entire, straight, tip strongly hooked; fixed finger 2.1 times as long as deep, with broad flattened tooth with row of small denticles in proximal part, separated by shallow notch from triangular acute tooth at midpoint of cutting edge, distal part of cutting edge entire, straight, tip strongly hooked; carpus 0.55 of palm length, 1.5 times longer than distal width, strongly tapering proximally; merus as long as carpus, 1.8 times longer than central width, distomedially excavate; ischium as long as merus, somewhat tapering proximally, with slightly protruded distomedial angle; basis and coxa without special features. Minor cheliped (Fig. 5B) similar, dactylus slightly longer in relation to palm than in major chela. Ambulatory pereiopods (Figs. 6, 7) short, stout. Dactylus of third pereiopod (Fig. 6A, B) with corpus moderately compressed, about 1.2 times longer than proximal width, with single row of few simple setae along ventral margin and in distal part, distoventral accessory tooth acute, perpendicular to flexor margin, ventral margin with one rounded protuberance at 2/3rd of ventral margin and one rounded protuberance proximally, without denticles in between; unguis strongly curved, about 0.5 of corpus length, distally with large dorsal scales, gradually decreasing in size proximally; propodus 2.8 times dactylus length, 4.7 times longer than proximal width, with one short, blunt, spine in distal part of flexor margin, with few long slender simple setae; carpus 0.64 of propodus length, 2.25 times longer than distal width, slightly tapering proximally, with indistinct distal lobe, unarmed; merus about as long as propodus, slightly swollen, about 2.8 times longer than central width, cylindrical; ischium 0.66 of merus length, 2.2 times longer than distal width; basis and coxa without special features. Fourth and fifth (Fig. 7A, B) pereiopods similar. Male first pleopod (Fig. 8A) with endopod 0.4 times as long as exopod, with 2 long distal setae, with row of 5 small simple setae on lateral margin. Male second pleopod (Fig. 8B, C) with endopod slightly shorter than exopod, with appendix masculina, equal to about half length of appendix interna, reaching halfway endopod, with 3 very long setulose setae distally. Uropods (Figs. 2D, 8D) normal, with short unarmed protopodite; exopod broad, 2.0 times longer than central width, lateral margin strongly convex, without distolateral tooth, with minute spinule distolaterally; endopod slightly exceeding exopod, reaching posterior margin of telson, 2.4 times longer than wide. Size. This is a small sized species, pocl. is 2.1 mm. Coloration. Not known. Host. Mollusca, Bivalvia, Chamidae, Chama lazarus Linnaeus, 1758. Distribution. Only known from the type locality: Berau Island, NE Kalimantan, Indonesia. Etymology. From the Indonesian word ‘kerang’, which translates to “bivalve”, combined with the Latin ‘ caris ’ referring to shrimp. Remarks. The species falls within the genus definition for Odontonia provided by Fransen (2002) and modified by De Gier & Fransen (2018). The new species has the accessory tooth on the dactyli of the ambulatory pereiopods similar to the ones found in O. rufopunctata, O. bagginsi, O. sibogae, O. compacta, and O. katoi. It differs from these species in the absence of a forward directed proximal tooth on the flexor margin of the corpus of the ambulatory dactyli. It also lacks the small denticles posterior to the distoventral accessory tooth on the dactylar corpus. Species of Odontonia are known as endosymbionts of solitary ascidians (De Gier & Fransen 2018). Odontonia kerangcaris sp. nov. is the first species within the genus recorded from a bivalve mollusk. The species has affinities with species of the closely related bivalve mollusk dwelling genus Conchodytes Peters, 1852 (Horká et al. 2016; Chow et al. 2021). The accessory tooth and protuberances on the flexor margin of the ambulatory pereiopods resemble almost all Conchodytes species except for C. chadi (Marin, 2011) and C. monodactylus (Holthuis, 1952). Other palaemonid endosymbionts known from chamid bivalves are Pontonia pilosa Fransen, 2002 and Bruceonia ardeae (Bruce, 1981). The East Atlantic P. pilosa has been recorded as an endosymbiont of Pseudochama cristella (Lamarck, 1819). B. ardeae has been recorded from the Great Barrier Reef, Australia, as an endosymbiont of Chama pacifica Broderip, 1835. Both P. pilosa and B. ardeae have the furry appearance shared with another palaemonid endosymbiont of bivalves: Pinnotherotonia rumphiusi Marin & Paulay, 2010, hosted by the venerid bivalve Periglypta crispata (Deshayes, 1854). A dense setal coverage has also been noted for several pinnotherine crabs infesting bivalves (De Gier & Becker 2020). The phylogenetic position of the new species seems to be at the base of the Odontonia clade and as sister of the Conchodytes clade (De Gier, Groenhof & Fransen, in prep.), revealing intrageneric host switching.Published as part of Fransen, Charles H. J. M., Groenhof, Mike & Gier, Werner De, 2021, Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching, pp. 275-285 in Zootaxa 5081 (2) on pages 276-283, DOI: 10.11646/zootaxa.5081.2.6, http://zenodo.org/record/577177
Marine palaemonoid shrimps of the Netherlands Seychelles Expedition 1992-1993
No full textAn account is given of the palaemonoid shrimps collected during an expedition with R/V Tyro to the Seychelles. A total of 59 species is recorded of which two are new to science: Conchodytes pteriae and Jocaste platysoma. 25 species were not previously recorded from the Seychelles. A checklist of caridean shrimps known from the Seychelles is provided
Notes on the genus Bythocaris G.O. Sars, with the description of a new species
No full textDuring the CANCAP-5 expedition to the Azores (1981) a new species of Bythocaris was found.
The new species is described and figured. It is compared with other members of the genus. A key to the species of Bythocaris is provided. The intra-specific morphological variation of B. payeri, B. leucopis and B. simplicirostris has been studied. The relevance of this intra-specific variation for distinguishing between species is discussed
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