1,516 research outputs found
Polyonyx heok Osawa & Ng 2016
No full textPolyonyx heok Osawa & Ng, 2016 (Fig. 1B) Polyonyx pedalis. — Haig 1964: 381.— Osawa 2007a: 26, fig. 3; 2007b: 37 (not Polyonyx pedalis Nobili, 1906). Polyonyx heok Osawa & Ng, 2016: 506, figs. 6–8, 15C, D (type locality: Singapore Strait, Pulau Jong, 1°12’54”N 103°47’12”E, 15.4 m). Material examined. Japan. Iriomote Island, Ryukyu Islands: RUMF-ZC-4395, 1 male (cl 3.7 mm), Nazuni, off Sonai, Dive 1, 20 m, in tube of Chaetopterus pacificus (RUMF-ZO-23), SCUBA diving, coll. T. Naruse & R. Yoshida, 30 September 2016; RUMF-ZC-4736, 1 ovigerous female (cl 7.6 mm), Nazuni, off Sonai, Dive 2, 20 m, in tube of C. pacificus (RUMF-ZO-24), SCUBA diving, coll. T. Naruse & R. Yoshida, 30 September 2016. Kagoshima Prefecture (southern Kyushu): RUMF-ZC-4501, 1 male (cl 9.0 mm), 1 ovigerous female (cl 10.7 mm), Tategamiiwa, Okikojima, Kagoshima (Sakurajima, Kinko Bay), 19.8 m, in tube of C. pacificus (RUMF-ZO-26), SCUBA diving, coll. R. Yoshida, D. Uyeno, Y. Endo & T. Naruse, 25 October 2016; RUMF-ZC-4502, 1 male (cl 9.4 mm), 1 ovigerous female (cl 10.5 mm), Kannonzaki, Kagoshima (Sakurajima, Kinko Bay), 15 m, in tube of C. pacificus (RUMF-ZO-25), SCUBA diving, coll. R. Yoshida, D. Uyeno, Y. Endo & T. Naruse, 24 October 2016. Coloration in life. The coloration of the specimens examined (Fig. 1B) agrees well with what was reported by Osawa & Ng (2016). Distribution. Known from wide area of the western Pacific: Singapore, Indonesia, New Caledonia, Vanuatu, and Japan (Osawa & Ng 2016). The previous record of P. heok from the Japanese waters was based on a specimen from Okinawa Island, Ryukyu Islands. The present specimens extend the distribution range of the species to the north, Kagoshima in Kyushu, Japan. Habitat. Occurring on sand and mud; depths of 7–65 m (Osawa & Ng 2016). The type specimens of P. heok are a heterosexual pair from Singapore and were collected from the tubes of Chaetopterus aff. pacificus Nishi, 2001, living on sandstones in subtidal reefs (Osawa & Ng 2016). The specimens examined from Iriomote Island and Kagoshima were obtained from parchment tubes of Chaetopterus pacificus which usually adhere to the underside of rocks partially buried in sand or gravel bottom. These suggest that P. heok probably prefers to live symbiotically with species of Chaetopterus that have their tubes underneath rocks. Remarks. The present specimens agree well with the original description of P. heok by Osawa & Ng (2016) in all diagnostic aspects. Two heterosexual pairs from Kagoshima (males, cl 9.0, 9.4 mm; ovigerous females, cl 10.5, 10.7 mm; RUMF-ZC-4501, 4502) are the largest known specimens.Published as part of Osawa, Masayuki, Naruse, Tohru & Ng, Peter K. L., 2018, New records of species of the Polyonyx sinensis group (Crustacea: Decapoda: Anomura: Porcellanidae) from Japan, the Philippines, Singapore, and Malaysia, with descriptions of two new species, pp. 303-323 in Zootaxa 4429 (2) on pages 306-307, DOI: 10.11646/zootaxa.4429.2.6, http://zenodo.org/record/128400
Polyonyx boucheti Osawa 2007
No full textPolyonyx boucheti Osawa, 2007 (Figs. 1A, 2) Polyonyx boucheti Osawa, 2007: 39, figs. 13–15 (type locality: Mepinyo, Santal Bay, Lifou Island, Loyalty Islands; Atelier LIFOU: sta. 1446, 20°50.8´S 167°09.7´E, 36–40 m).— Osawa & McLaughlin 2010: 114 (list).— Osawa & Poupin 2013: 1, figs. 1, 2. Polyonyx aff. boucheti.—Poupin et al. 2013: 22, fig. 11D. Material examined. Philippines. PANGLAO 2004 Marine Biodiversity Project: ZRC 2017.204, 1 male (cl 1.5 mm), 1 female (cl 1.7 mm), Alona Reef, Panglao Island, sta. B2, 9°33.0'N, 123°46.5'E, 5 m, reef slope, brushing, 31 May 2004; ZRC 2017.205, 1 male (cl 1.6 mm), Doljo point, Panglao Island, sta. B12, 9°35.6'N, 123°43.2'E, 24– 27 m, reef slope, brushing, 14 June 2004; ZRC 2017.206, 1 ovigerous female (cl 1.7 mm), Napaling, Panglao Island, sta. B21, 9°37.2'N, 123°46.4'E, 20–21 m, reef wall with small caves, brushing, 24 June 2004; ZRC 2017.207, 1 male (cl 1.3 mm), Pontod Lagoon, Panglao Island, sta. B39, 9°32.8'N, 123°42.1'E, 17–25 m, reef wall with small caves, brushing, 3 July 2004. Japan. Kume Island, Ryukyu Islands, KUMEJIMA 2009 Marine Biodiversity Expedition: RUMF-ZC-4735, 1 male (cl 1.7 mm), Madomari, fishing port, 2–3 m, on mooring rope, associated animal not recorded, coll. T. Komai, 21 November 2009. Coloration in life. Uncertain in the present specimens. The photographed specimen (Fig. 1A) may be a female from St. B2 of the PANGLAO 2004 Marine Biodiversity Project and it is very similar to an ovigerous female of P. boucheti from Mayotte shown by Osawa & Poupin (2013: fig. 2) in the fresh coloration. Distribution. Known only from the Loyalty Islands in the southwestern Pacific and Comoro Islands in the southwestern Indian Ocean (Osawa & Poupin 2013); now from the Philippines, and the Ryukyu Islands in the north hemisphere side of the western Pacific. Habitat. Coral-sand, depths of 5–40 m (Osawa & Poupin 2013). The present specimens were found on a mooring rope in a fishing port at the depth of 2–3 m or collected by brushing coral rubble from reef slopes or walls at the depths of 5– 27 m. Although all the known specimens of P. boucheti have not been recorded as commensal of any animals, the species probably lives symbiotically with a tube-dwelling polychaete as in many species of the P. sinensis group defined by Johnson (1958) (cf. Ng & Sasekumar 1993; Werding 2001; Osawa & Poupin 2013). The host polychaetes may be small-sized, non-chaetopterids that live in fragile tubes. Remarks. The present specimens agree well with the descriptions of P. boucheti by Osawa (2007) and Osawa & Poupin (2013) in diagnostic aspects, except for the somewhat proportionally broader carpus of the cheliped (Fig. 2C) and comparatively stouter ambulatory legs, particularly the propodi (Fig. 2E).Published as part of Osawa, Masayuki, Naruse, Tohru & Ng, Peter K. L., 2018, New records of species of the Polyonyx sinensis group (Crustacea: Decapoda: Anomura: Porcellanidae) from Japan, the Philippines, Singapore, and Malaysia, with descriptions of two new species, pp. 303-323 in Zootaxa 4429 (2) on pages 304-306, DOI: 10.11646/zootaxa.4429.2.6, http://zenodo.org/record/128400
Pagurixus Osawa & Komai, 2007, n. sp.
No full textDistribution of Pagurixus species in Japan Thanks to the recent taxonomic studies (Komai & Myorin 2005; Komai 2006; Komai & Osawa 2006, 2007; Komai & Takada 2006; Osawa et al. 2006), our knowledge on the fauna of Pagurixus hermit crabs has been enriched, although it is likely that many more unknown forms await discovery. Sixteen Pagurixus species, including the new species in this study, are now known from Japan. All species occur in warm temperate, subtropical, and tropical zones, categorized by Nishimura (1992). According to the distributional pattern, the Japanese species can be roughly divided into three groups. The first group consists of species chiefly distributed in the Ryukyu Islands, some of which extend to north along the Pacific coast of the Japanese mainland and along with the Kuroshio Current, or even to the Izu-Ogasawara Islands. These include P. anceps, P. c a r i n i - manus, P. concolor, P. dissimilis n. sp., P. haigae, P. longipes, P. maorus, P. nanus, P. nomurai, P. patiae, P. pseliophorus, P. pulcher, and P. r u b e r. Among them, P. anceps, P. carinimanus, P. concolor, P. haigae, P. maorus, P. nomurai, and P. ruber, are widespread in the Indo-West Pacific or western Pacific. The second group includes species occurring in the Izu-Ogasawara Arc, viz., P. boninensis, P. brachydactylus, and P. tweediei. Particularly, P. t w e e d i e i is common in subtidal zone in the Ogasawara Islands (our unpublished observation). Pagurixus tweediei does not appear to occur in the Ryukyu Islands, although it is widely distributed in the Indo-West Pacific. The third group comprises only P. fasciatus, which appears restricted to the Izu Islands and the southwestern part of the Japanese mainland (Okuno et al. 2006). It should be noted, however, that a mixture of species from these three groups occurs on the Pacific coast of the southwestern Japanese mainland. According to Nishimura (1992), the Ryukyu and Ogasawara Islands are both referred to the tropical zone. The faunal composition of Pagurixus, however, is quite different as also shown in other shallow-water invertebrates such as porcellanid crabs and gastropod molluscs (Asakura 1991; Fukuda 1994). These different patterns of distribution suggest that Pagurixus species have different strategies of larval dispersal and habitat selection.Published as part of Osawa, Masayuki & Komai, Tomoyuki, 2007, A new hermit crab species of the Pagurixus anceps group (Crustacea: Decapoda: Anomura: Paguridae) from southern Japan, and supplemental notes on P. patiae Komai, 2006, pp. 41-51 in Zootaxa 1627 on pages 49-50, DOI: 10.5281/zenodo.17930
Munidopsis latiangulata Osawa, Lin & Chan 2006
No full textMunidopsis latiangulata Osawa, Lin & Chan, 2006 Munidopsis latiangulata Osawa et al., 2006b: 251, figs 1–4 (Taiwan, 2220–2424 m). Type data: holotype, ovigerous female, NTOU A00804. Type locality: Taiwan, 24º16.34´N, 122º11.67´E, 2220–2424 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 146, DOI: 10.11646/zootaxa.1905.1.1, http://zenodo.org/record/513458
Munidopsis dentifalx Osawa, Lin & Chan 2007
No full textMunidopsis dentifalx Osawa, Lin & Chan, 2007 Munidopsis dentifalx Osawa, Lin & Chan, 2007: 15, figs 1–3 (between Negros and Mindanao, Philippines, 2120–2323 m). Type data: holotype, ovigerous female, NMCR. Type locality: Philippines, 8°49.6´N, 123°02.6´E, 2120–2149 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 140, DOI: 10.11646/zootaxa.1905.1.1, http://zenodo.org/record/513458
Polyonyx deezi Osawa & Sato 2022, n. sp.
No full textPolyonyx deezi n. sp. [New Japanese name: Kawari-yadori-kanidamashi] (Figs. 1–4) Type material. Holotype: RUMF-ZC 7601, male (cl 2.3 mm, cw 3.0 mm), Sakimotobu, Motobu, Okinawa Island, 8–12 m, coral sand, associated with Chaetopterus sp., 21 February 2021, collected by T. Sato. Paratype: RUMF-ZC 7602, 1 male (cl 2.2 mm, cw 2.8 mm), same data as in holotype. Diagnosis. Numerous granules and short granular ridges on dorsal surfaces of carapace and chelipeds. Carapace with median branchial margins being bluntly angular and produced laterally; gastric, branchial, cardiac regions with 1, 2, 1 distinct protuberances, respectively. Rostrum produced anteriorly in dorsal view, trilobed, median lobe roundly triangular; anterior margin with row of sparse short setae. Third thoracic sternite slightly concave on anteromedian margin. Telson distal plates each distinctly longer than broad. Antennal first article approximately 0.8 length of combined second to fourth articles. Third maxilliped merus with roundly subrectangular lobe on ventrolateral margin. Chelipeds somewhat unequal in size; meri each with broad, rounded lobe distally on dorsoanterior margin; carpi and palms each with at least 1 distinct protuberance on dorsal surface; carpi comparatively short, 1.3–1.4 times as long as broad, dorso-anterior margin gently convex, without distinct row of setae; chelae with dense, soft plumose setae on dorso-anterior surface; palms inflated dorsoventrally; dactylus of larger cheliped short, 0.3–0.4 length of chela. Ambulatory legs moderately short, numerous short ridges on lateral surfaces of meri and carpi; meri wide, 1.5–1.8 times as long as high in mesial view, strongly convex on dorsal margins; ventral surfaces concave distally to receive ventral margins of carpi; propodi comparatively short, 2.8–3.1 times as long as high, ventral margins each with 1 or 2 corneous spines in addition to 2 corneous spines at terminal end; dactyli each with dorsal claw much smaller than ventral claw, ventral margins with 2 teeth each bearing small corneous spine. Male with pair of gonopods on second abdominal somite. Description. Carapace (Fig. 1A, B) hexagonal in general outline, 1.2–1.3 times as broad as long, broadest on median branchial margins. Dorsal surface slightly convex, covered with numerous granules and short granular ridges and sparse short setae; 5 transverse protuberances present (1 on mesogastric region, 2 mesially on branchial region, and 1 cardiac region, respectively). Protogastric ridges well demarcated, elevated. Cervical grooves shallow. Hepatic margins convex. Branchial margins divergent on anterior half and convergent on posterior half, with row of short and moderately long plumose setae; median margin bluntly angular, produced laterally; anterior half margin carinate, thin, with shallow sulcus mesially; posterior half gently convex. Posterior margin with elevated ridge of granules. Rostrum (Fig. 1A, C) moderately broad, reaching beyond anterior margin of eyes, produced anteriorly in dorsal view, ventrally bent toward anterior tip, trilobate in anterior view; median lobe triangular, with rounded apex, slightly overreaching rounded lateral lobes, with shallow median longitudinal groove on dorsal surface; anterior margin with row of sparse short setae. Orbits moderately shallow; supra-orbital margins slightly concave; lateral orbital angles rounded. Pterygostomial flaps (Fig. 1B) entire; surface with short ridges on dorsal half and long undulate ridge on longitudinal midline; scattered plumose setae, numerous ventrally; dorso-anterior surface somewhat concave, rounded anteriorly. Third thoracic sternite (Fig. 1D) 3.5 times as broad as long measured on midline; surface somewhat convex medially, with few granules anterolaterally; anterior margin slightly concave on median part, with row of sparse setae; lateral lobes narrow, produced, each with rounded apex. Fourth thoracic sternite with anterior margin moderately concave; surface depressed medially, with 2 transverse rows of small tubercles, anterior row bearing setae. Telson (Fig. 1E) slightly broader than long, composed of 7 plates; lateroproximal plates much smaller than others; distal plates each distinctly longer than broad. Ocular peduncles (Fig. 1A, G, H) moderately small, short; dorsal extension onto cornea low, rounded. Basal article of antennular peduncle (Fig. 1F) approximately as long as broad; anterior margin slightly convex, somewhat undulate; ventral surface with row of small tubercles on anterior margin and transversely oblique row of small tubercles laterally; ventro-anterior face slightly concave, with many granules. Antennal peduncle (Fig. 1A, G, H) slender. First article broad, largest, approximately 0.8 length of combined second to fourth articles, produced forward in lateral view, broadly in contact with lower orbital margin; surface shallowly concave, with numerous granules and blunt ridge along ventral margin; anterior margin tapering, terminating in rounded apex. Second and third articles roundly rectangular, with granules and short granular ridges marginally; third article elongate. Fourth article short, rounded, nearly smooth. Third maxilliped (Fig. 1I, J) with coxa bearing blunt projection on ventrodistal margin; distomedian projection with blunt transverse ridge, not articulated. Basis articulating with ischium, subtriangular. Ischium broad, with ventral margin strongly convex; lateral surface with sparse granules and weak longitudinal ridge along dorsal margin; dorsodistal projection blunt; long, soft plumose setae on ventrodistal surface. Merus with laminate, roundly subrectangular lobe on ventrolateral margin; lateral surface with scattered granules and short ridges. Carpus with small subtriangular projection on median part of ventral margin and with row of short blunt ridges on dorsal surface. Propodus moderately elongate, with row of short blunt ridges on dorsal surface. Dactylus short, subtriangular, nearly smooth. Merus to dactylus with long plumose setae on ventral margins. Exopod with proximal article small, rounded; distal article laminate, robust, reaching distal two-thirds of merus, constricted on median part, with row of short ridges dorsally; distal flagellum present. Chelipeds (first pereopods; Figs. 2A–F, 3A, B) somewhat unequal in size, left thicker than right; dorsal and ventral surfaces of merus to dactylus covered with numerous granules and short granular ridges and with sparse very short setae. Larger cheliped (Fig. 2A–F) with ischium slightly crenulated but without spines on ventro-anterior margin; scattered, soft plumose setae on dorsal surface and anterior margin. Merus with blunt transverse crest submedially on dorsal surface; dorso-anterior margin with broad, rounded lobe distally; ventro-anterior margin crenulate, anterodistal corner with small tubercle; sparse, soft plumose setae on dorsoproximal part and ventroanterior distal corner. Carpus 1.3–1.4 times as long as broad, broadest on median part; dorsal surface slightly convex, with transverse protuberance on median part; dorso-anterior margin with elevated lobe, anterior margin of lobe gently convex, slightly crenulated, bearing few short setae, proximal corner of lobe roundly angled; dorsodistal margin posteriorly with roundly produced lobe bearing tuft of plumose setae; posterior margin rounded; ventro-anterior margin concave on median or distal one third part; ventrodistal margin with row of plumose setae. Chela 1.8–1.9 times as long as carpus, relatively narrow, 3.0–3.2 times as long as broad, lying on anterior side; anterior margin delimited by row of small, blunt and subacute denticles; dorso-anterior surface with dense, short and long, soft plumose setae. Palm somewhat inflated; dorsal surface convex, with 2 elongate protuberances on midline, proximal protuberance much lower than distal protuberance or obsolete; dorsoposterior margin with weak, longitudinal blunt ridge; ventral surface convex. Fixed finger with weakly curved, blunt distal claw; ventral surface with tuft of short plumose setae on base of fixed finger; cutting edge with row of blunt teeth, median tooth larger. Dactylus 0.3–0.4 length of chela, opening at oblique angle, with curved, blunt distal claw; dorsal surface with longitudinal ridge composed of small blunt and subacute denticles posteriorly on midline, dorso-anterior surface proximally with soft plumose setae; posterior margin rounded, with short blunt carina proximally; cutting edge with 2 large blunt teeth each on subproximal and subdistal parts and small blunt teeth; ventral surface proximally with sparse, short plumose setae adjacent to cutting edge. Smaller cheliped (Fig. 3A, B) generally similar to larger cheliped except for: chela proportionally broader, 2.8–3.1 times as long as broad; distal claws of fixed finger and dactylus narrower; cutting edges of fixed finger and dactylus each with entire row of much smaller blunt and subacute teeth; dactylus proportionally longer, 0.4–0.5 length of chela. Ambulatory legs (second to fourth pereopods, P2–P4; Fig. 3C–H) moderately short, compressed laterally, decreasing in size posteriorly (P2 largest); P2 merus 1.1 and 1.3–1.4 times respective P3 and P4 meri lengths; P2 propodus 1.1 and 1.2–1.3 times respective P3 and P4 propodi lengths; dorsal and ventral margins with long, soft plumose setae on meri to propodi; latero-distal margins of propodi and dorsal and ventral margins of dactyli with sparse stiff setae. Ischia without weakly calcified parts on each mesial surface. Meri 1.8 (P2), 1.6 (P3), and 1.5 (P4) times as long as high in mesial view, highest on each submedian or median part; dorsal margin strongly convex, bluntly cristate; lateral surface with numerous transverse granular ridges bearing sparse short setae; mesial surfaces covered with granules and granular ridges, weakly calcified on dorsoproximal part; ventrodistal margins of lateral and mesial surfaces rounded; ventral surface concave distally to receive ventral margin of carpus, ventromesial margin thin, gently convex. Carpi moderately elongate; lateral surface with irregular rows of short ridges bearing sparse short setae; dorsodistal and ventrodistal margins rounded. Propodi 3.0–3.1 (P2), 2.8 (P3 and P4) times as long as high, broadest on each subproximal part; lateral surface with short transverse ridges bearing sparse short setae; dorsal margin weak crenulated; ventral margin slightly concave on median part, with 1 or 2 corneous spines, subdistal spine always present, subproximal spine present or absent; ventrodistal margin with 2 corneous spines subequal in size. Dactyli 0.4–0.5 times as long as propodi, each terminating in curved, sharply pointed, bifurcate claws, dorsal claw much smaller than ventral claw; ventral margin with 2 low teeth, distal tooth larger than proximal tooth, each tooth with small corneous spine. Fifth pereopod slender, chelate; propodus with numerous short simple setae and 2 subdistal hooked setae. Male with pair of gonopods on second abdominal somite; endopod elongate, oval, somewhat twisted medially, rounded on distal margin; exopod small, rounded. Coloration in life. Body and pereopods white in ground color. Carapace with numerous but scattered, small brown spots; some dark brown spots on anterior lateral margins and posterior margin. Basal article of antennular peduncle white; penultimate and ultimate peduncular articles and flagella translucent white. Antennal peduncle white, flagella translucent, pale brown. Third maxilliped also white in general. Merus and carpus of each cheliped with pale brown tint and with some brown blotches and small dark brown spots on dorsal surface; palm with 3 or 4, small dark brown blotches on proximal half of dorsal surface; dactylus with large dark brown blotch on proximal half posteriorly. Ambulatory legs with dark brown markings; meri each with blotch dorsally on midlength in P2 and P3 (size of blotch much smaller in P3) or no blotch (P4); carpi each with transverse blotch on half of dorsal surface; propodi each with ring (P2 and P3) or dorsal blotch (P4) on midlength. All setae whitish. See Fig. 4. Distribution. So far only known from the type locality, Okinawa Island, Ryukyu Islands, southwestern Japan. Habitat. The two type specimens were extracted from sand bottom at a depth of 8–12 m, coral reef environment, using a commercial suction pump (yabby pump). They were found inside tubes of an unidentified species of the polychaete genus Chaetopterus Cuvier, 1830 (family Chaetopteridae). The worm specimens are not preserved. Although the tubes obtained were broken and incomplete, they were externally covered with sand and small shell fragment and their bare surfaces have a stiff parchment-like appearance. The largest widths of the tubes were approximately 10–20 mm. No females of the present new species were obtained. Etymology. The species name is derived from the Ryukyu language deezi which means “very”, in reference to the clearly discriminable morphology of the new species in the genus Polyonyx. Remarks. Polyonyx deezi n. sp. is immediately distinguished from all other congeners by the median branchial margins of the carapace being bluntly angular and produced laterally and the dorsal surfaces of the carapace and of carpi and palms of the chelipeds with distinct protuberances. In other congeners, the branchial margins of the carapace are evenly convex or nearly straight and subparallel, and somewhat constricted on the median part, and no distinct protuberances on the carapace and chelipeds. The new species belongs to the P. sinensis group, an informal species group of the genus defined by Johnson (1958), primarily characterized by having the carapace without spines on the lateral margins, the chela with various degrees of setation on the dorso-anterior surface and the ambulatory dactyli each with the dorsal claw much smaller than the ventral claw. The species group includes 18 species from the Indo-West Pacific (cf. Osawa 2018; Osawa et al. 2018; Werding & Hiller 2019): P. angustus Osawa, 2018; P. boucheti Osawa, 2007; P. haigae McNeill, 1968; P. heok Osawa & Ng, 2016; P. kumejima Osawa & Ng, 2016; P. loimicola Sankolli, 1965; P. maccullochi Haig, 1965; P. pedalis Nobili, 1906; P. pilosibrachium Osawa, Naruse & Ng, 2018; P. planus Osawa & Ng, 2016; P. sasekumari Osawa, Naruse & Ng, 2018; P. sinensis Stimpson, 1858; P. socialis Werding & Hiller, 2019; P. transversus (Haswell, 1882); P. thai Werding, 2001; P. tulearis Werding, 2001; P. utinomii Miyake, 1943; and P. vermicola Ng & Sasekumar, 1993. Among the species group, P. deezi n. sp. may be closest to P. socialis known from Vietnam in the comparatively short carpi of the chelipeds and broad meri of the ambulatory legs in their proportions. Nevertheless, the new species differs from P. socialis in the dorsal surface of the carapace covered with granules instead of shallow transversal striae, the anterior margin of the median lobe of the third thoracic sternite being concave instead of convex, the carpi and palms of the chelipeds and meri of the ambulatory legs with numerous granules and granular ridges on the dorsal or lateral surfaces, and the dorso-anterior marginal lobe of the carpus of each cheliped being more weakly developed, in addition to the distinction mentioned above. Coloration is also different between P. deezi n. sp. and P. socialis; the dorsal surfaces of the carapace and chelipeds are generally white in the new species, rather than brown in P. socialis. On the Vietnamese coast, Britayev et al. (2017) reported that P. socialis (as an undescribed species at that time) occurred in heterosexual pairs in the tube of a possibly undescribed species of Chaetopterus and frequently shared the polychaete tube with a heterosexual pair of significantly larger congeneric porcellanid P. heok and the tergipedid nudibranch Phestilla sp. or rarely with larger pinnotherid crab Tetrias sp. instead of P. heok. Werding & Hiller (2019) remarked that the extremely broadened carpi of the chelipeds and meri of the ambulatory legs of P. socialis are distinctive characters within the genus Polyonyx, and these characters are most likely adaptations for living tightly attached to the walls of the worm tube without being perceived as an obstacle for the larger crabs inhabiting the same tube. Polyonyx deezi n. sp. has similarly broadened carpi of the chelipeds and meri of the ambulatory legs, but no females nor other symbiont animals were obtained from the same tubes of host polychaetes. The Chaetopterus worms as candidates of the hosts of P. deezi n. sp. have not been preserved, but they are likely relatively small-sized species considering from the size of the broken tubes collected (10–20 mm in the largest widths of the tubes), and the space occupied by P. deezi n. sp. inside the tube can be very narrow. It is difficult at present to persuasively explain the morphological significance of the broadened chelipeds and ambulatory legs in P. deezi n. sp. as well as the presence of distinct protuberances on the dorsal surfaces of carapace and chelipeds. In Japanese waters including the Ryukyu Islands, unlike observations of the Vietnamese material by Britayev et al. (2017), P. heok is found in heterosexual pairs or singly in parchment tubes of C. pacificus Nishi, 2001, which usually adhere to the underside of rocks partially buried in sand or gravel bottom of embayed coasts (cf. Osawa et al. 2018); other symbionts, at least porcellanid or brachyuran crabs, from the same host tubes were never recorded. At Iriomote Island of the Ryukyus, Naruse et al. (2017) recorded an example of co-existence of an ovigerous female of P. pilosibrachium (as P. cf. utinomii) and an ovigerous female of hexapodid brachyuran Hexapinus simplex Rahayu & Ng, 2014 from the same tube of Chaetopterus cautus Marenzeller, 1879. The occurrence of P. deezi n. sp. from coral reefs as a rather exposed environment may be unusual in species of the P. sinensis group because many species of the group have been recorded from estuaries or coastal embayments. Only P. angustus, P. boucheti, P. kumejima, and P. planus were obtained from substrates of coral rubble or sand, although their commensal host animals were not always recorded (Osawa & Ng 2016; Osawa 2018; Osawa et al. 2018). Osawa et al. (2018) presented an identification key to the Indo-West Pacific species of the Polyonyx sinensis group known at the time. The identification key is amended with the addition of two species described since Osawa et al. (2018), P. angustus and P. socialis, and the present new species, as shown below.Published as part of Osawa, Masayuki & Sato, Taigi, 2022, A distinctive new species of the genus Polyonyx Stimpson, 1858 (Crustacea Decapoda: Anomura: Porcellanidae) from Okinawa, southwestern Japan, pp. 587-597 in Zootaxa 5091 (4) on pages 588-594, DOI: 10.11646/zootaxa.5091.4.6, http://zenodo.org/record/586425
Two new species of Turleania McLaughlin, 1997 (Crustacea: Decapoda: Anomura: Paguridae) from the Ryukyu Islands, southwestern Japan, and a redescription of T. balli (McLaughlin & Haig, 1996)
No full textOsawa, Masayuki, Fujita, Yoshihisa (2008): Two new species of Turleania McLaughlin, 1997 (Crustacea: Decapoda: Anomura: Paguridae) from the Ryukyu Islands, southwestern Japan, and a redescription of T. balli (McLaughlin & Haig, 1996). Zootaxa 1753: 49-68, DOI: 10.5281/zenodo.18175
Trichopagurus macrochela Komai & Osawa 2005
No full textTrichopagurus macrochela Komai & Osawa, 2005 Trichopagurus trichophthalmus. — Baba 1982: 68 (part). Trichopagurus macrochela Komai & Osawa, 2005: 3, figs. 1–3. — McLaughlin et al. 2010: 36. Material examined. Japan. Fuki, Kuroshima Island, Yaeyama Islands, Ryukyu Islands, 2 m, lagoon, 3 September 1998, coll. Keiichi Nomura, 1 ovigerous female (sl 1.9 mm), CBM-ZC 8942; Kikai Island, Amami Islands, intertidal, 25 May 2005, coll. T. Komai, 1 female (sl 1.8 mm), CBM-ZC 9557. Philippines. PANGLAO 2004, stn B 9, Napaling, Panglao Island, Bohol, Philippines, 09° 33.1 'N, 123 °44.0'E, 8–10 m, caves in reef wall, 8 June 2004, 1 ovigerous female (sl 1.4 mm); stn B 18, Sungcolan Bay, Panglao Island, 09° 38.5 'N, 123 ° 49.7 'E, 3–5 m, blocks dispersed among sea grass, 20 June 2004, 3 males (sl 1.4 –2.0 mm), 1 female (sl 2.1 mm), 1 ovigerous female (sl 2.0 mm). Distribution. Previously known from southern Japan and Yap, Palau (Komai & Osawa 2005); intertidal to 10 m. Herein newly recorded from the Philippines.Published as part of Komai, Tomoyuki, 2013, Additional records of the pagurid hermit crab genus Trichopagurus de Saint Laurent, 1968 (Crustacea: Decapoda: Anomura), with description of a new species from the Philippines, pp. 274-282 in Zootaxa 3670 (2) on page 280, DOI: 10.11646/zootaxa.3670.2.10, http://zenodo.org/record/21794
Munidopsis echinata Osawa, Lin & Chan 2008
No full text<i>Munidopsis echinata</i> Osawa, Lin & Chan, 2008 <p> <i>Munidopsis echinata</i> Osawa <i>et al.</i>, 2008: 43, figs 1G, 3, 4 (Taiwan, 3032–3065 m).</p> <p>Type data: holotype, female, NTOU A00831.</p> <p>Type locality: Taiwan, 24º19.20´N, 122º04.22´E, 3032–3065 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 140, DOI: 10.11646/zootaxa.1905.1.1, <a href="http://zenodo.org/record/5134587">http://zenodo.org/record/5134587</a>
Polyonyx pilosibrachium Osawa & Naruse & Ng 2018, n. sp.
No full textPolyonyx pilosibrachium n. sp. (Figs. 1C, D, 3–5) Polyonyx cf. utinomii . — Naruse et al. 2017: 2, fig. 2C (not Polyonyx utinomii Miyake, 1943). Type material. Holotype: CBM-ZC 14134, male (cl 3.0 mm), Funaura, Iriomote Island, Ryukyu Islands, Japan, lower intertidal, in tube of Chaetopterus cf. cautus, digging, coll. T. Komai, 24 June 2005. Paratypes. Japan. Ryukyu Islands. Kume Island, KUMEJIMA 2009 Marine Biodiversity Expedition: RUMF- ZC-4737, 1 male (cl 2.6 mm), 1 female (cl 3.0 mm), sta. 52, 26°20.40'– 26°20.01'N, 126°49.67' –126°49.224'E, 5.1– 4.5 m, dead coral branches and rubbles, dredge, 17 November 2009; RUMF-ZC-4738, 1 male (cl 1.8 mm), sta. 56, 26°19.36'–26°19.29'N, 126°49.20'–126°49.19'E, 7.5– 4.7 m, dead coral blocks and rubbles, dredge, 17 November 2009. Iriomote Island: CBM-ZC 8872, 1 male (cl 2.4 mm), 1 female (cl 2.4 mm), 1 ovigerous female (cl 3.8 mm), Funaura, lower intertidal, in tubes of C. cf. cautus, digging, coll. T. Komai, 24 June 2005; RUMF-ZC-4387, 1 male (cl 3.9 mm), Funaura, intertidal, in tube of C. cf. cautus, digging, coll. R. Yoshida, 14 June 2015, 1 male (cl 3.4 mm), 1 ovigerous female (cl 4.1 mm), RUMF-ZC-4386. Funaura, intertidal, in tube of C. cf. cautus, digging, coll. R. Yoshida, 27 October 2015; RUMF-ZC-4385, 1 ovigerous female (cl 3.3 mm), Off Funaura Port, 24°24.41'N 123°49.13'E, 2–6 m, in tube of C. cf. cautus (RUMF-ZO-29), SCUBA diving, coll. T. Naruse & R. Yoshida, 4 August 2016; RUMF-ZC-4388, 1 male (cl 3.2 mm), Off Funaura Port, 24°24.41'N 123°49.13'E, 2–6 m, in tube of C. cf. cautus, SCUBA diving, coll. T. Naruse & R. Yoshida, 4 August 2016; RUMF-ZC-4393, 1 male (cl 1.8 mm), Midara, intertidal, coll. T. Naruse, 14 August 2014; CBM-ZC 14135, 3 males (cl 1.7–2.1 mm), Shirahama, intertidal, in tubes of C. cf. cautus, digging, coll. T. Komai, 22 June 2005; RUMF-ZC-4389, 1 ovigerous female (cl 3.3 mm), Shirahama, intertidal, mud, sea grass, in tube of C. cf. cautus, coll. M. Osawa, 16 June 2011; RUMF-ZC- 4391, 1 male (cl 2.8 mm), Shirahama, intertidal, coll. T. Naruse, T. Komai & T. Maenosono, 14 May 2014; RUMF- ZC-4392, 1 male (cl 3.1 mm), 1 ovigerous female (cl 3.1 mm), Amitori Bay, near river mouth, intertidal, coll. T. Naruse & T. Maenosono, 16 May 2014. Description. Carapace (Figs. 3A) transversely ovate in general outline, 1.3–1.4 times as broad as long, broadest on median branchial margins. Dorsal surface nearly flattish from side to side (slightly convex on gastric and branchial regions), entirely covered with short and relatively long, transverse striae anteriorly bearing sparse minute setae. Protogastric ridges and cervical grooves weakly demarcated. Hepatic margins weakly or moderately convex. Branchial margins strongly convex, weakly constricted on each median part; anterior 0.6 margins thin, each with row of plumose setae; posterior margins and adjacent regions with long, transverse ridges. Rostrum (Fig. 3B) moderately broad, not produced beyond eyes, weakly produced in dorsal view, ventrally bent toward anterior tip; trilobate in frontal view, median lobe bluntly triangular, overreaching rounded lateral lobes, without median longitudinal groove; dorso-anterior surface with sparse short setae, those of row on anterior margin longer. Orbits shallow; supra-orbital margins slightly concave; lateral orbital angles rounded. Pterygostomial flaps entire, with short and long, longitudinal ridges; dorso-anterior margin terminating subacutely (Fig. 3E, F). Third thoracic sternite (Fig. 3C) 3.5–3.8 times as broad as long measured on midline, with surface somewhat depressed medially; anterior margin trilobite, with sparse long setae; median lobe very broad, convex on anterior margin; lateral lobes narrow, reaching anterior margin of median lobe, each with rounded apex. Fourth thoracic sternite with anterior margin weakly or moderately concave; surface depressed medially, with transverse series of short ridges anteriorly. Telson (Fig. 3D) composed of 7 plates; proximolateral plates much smaller than others; distal plates as long as or slightly longer than broad. Ocular peduncles (Fig. 3A, E, F) moderately small, short; dorsal extension onto cornea rounded. Basal article of antennular peduncle (Fig. 3F) approximately as long as broad; anterior margin slightly convex and undulate; ventral surface with transverse ridge anteriorly and short row of granules medially; ventro-anterior face slightly concave. Antennal peduncle (Fig. 3E, F) slender, with irregular, short striae on surfaces. First article largest, approximately 0.7 times length of combined second to fourth articles, produced forward in lateral view, broadly in contact with lower orbital margin, with blunt ridge along ventral margin; surface shallowly concave; anterior margin tapering, terminating in narrowly rounded apex (Fig. 3G). Second and third articles roundly rectangular, third article elongate. Fourth article short, rounded. Third maxilliped (Fig. 3H) with coxa bearing blunt projection on ventrodistal margin; distomedian projection with blunt transverse ridge, not articulated. Basis articulating with ischium, rounded subtriangular. Ischium broad, ovate; lateral surface with undulate ridges and longitudinal ridge along dorsal margin; dorsodistal projection blunt. Merus with laminate, roundly subrectangular lobe on ventrolateral margin; lateral surface with undulate ridges and longitudinal ridge along dorsal margin. Carpus with small subtriangular projection on median part of ventral margin and with longitudinal ridge on dorsal surface. Propodus slender, nearly smooth on lateral surface. Dactylus short, subtriangular. Merus to dactylus with long plumose setae on ventral margins. Exopod with proximal article small, rounded; distal article laminate, robust, reaching midlength of merus, somewhat constrict on median part, with row of transverse ridges dorsally; distal flagellum present. Chelipeds (first pereopods, Fig. 4A–G) unequal in size; dorsal surface covered with short and relatively long striae bearing sparse minute setae (striae on meri and carpi generally longer and more distinct); short to long plumose setae (lateral setules minute) present on anterior and posterior margins of merus to chela and also on dorso-anterior and ventroposterior surfaces of chela, ventroposterior setae of chelae sparse. Larger cheliped (Fig. 4A–C) with ischium bearing no spines on ventro-anterior margin. Merus with rounded transverse crest submedially on dorsal surface; dorso-anterior margin with broad, rounded lobe distally; ventral surface with transverse striae; ventro-anterior distal corner rounded. Carpus 1.7 times as long as broad, broadest on median part; dorsal surface slightly convex, posterior margin rounded; dorso-anterior margin with elevated lobe, anterior margin of lobe nearly transverse, slightly crenulated or with row of granules; dorsodistal margin with low, rounded lobe on posterior part; ventral surface with transverse striae; ventro-anterior margin nearly transverse. Chela 1.7–1.8 times as long as carpus, relatively narrow, 3.2–3.3 times as long as broad, lying on anterior side; anterior margin thin and with row of small rounded denticles (occasionally obsolete) on distal 0.7. Palm somewhat inflated; dorsal surface convex; dorsoposterior margin with longitudinal blunt ridge distally; ventral surface convex, with short striae along anterior margin. Fixed finger with weakly curved distal claw; dorsal surface less striate than on that of palm, with blunt ridge along midline; cutting edge with large, subtriangular tooth proximally followed by small rounded teeth. Dactylus 0.3 length of chela, opening at oblique angle, with weakly curved distal claw; dorsal surface with longitudinal ridge composed of small tubercles on midline; posterior margin with blunt carina proximally; cutting edge concave, with large, rounded tooth proximally and with small, low, rounded teeth distally. Smaller cheliped (Fig. 4D–G) similar to larger cheliped in general outline, except for: chela proportionally shorter and narrower, 1.5–1.6 times as long as carpus and 3.4–3.7 times as long as broad, with row of small but distinct denticles on almost entire part of anterior margin; cutting edges of fixed finger and dactylus nearly straight, each with row of small rounded teeth; dactylus proportionally longer, 0.4 length of chela, opening at more stronger angle, with more strongly developed, longitudinal ridge composed of stronger tubercles on dorsomidline. Ambulatory legs (second to fourth pereopods, Fig. 5A–E) moderately short, decreasing in size posteriorly (second largest), compressed laterally, with scattered, short to long plumose setae (lateral setules minute) marginally; lateral surfaces nearly smooth except for short ridges on laterodorsal parts of meri; mesial surfaces with short ridges on meri and carpi, but nearly smooth on propodi and dactyli. Ischia each weakly calcified on dorsodistal part of mesial surface. Meri 2.5–2.7 (second), 2.3–2.4 (third), and 2.0–2.3 (fourth) times as long as high in lateral view, highest slightly proximal to median part; dorsal margins slightly crenulated, gently convex; mesial surfaces weakly calcified on proximal part; ventrodistal margins of lateral and mesial surfaces rounded. Carpi slender (second and third) or stout (fourth); dorsodistal and ventrodistal corners rounded. Propodi 2.8–3.1 (second), 2.7–2.9 (third), and 2.7–3.0 (fourth) times as long as high, highest at base of proximalmost ventral corneous spine; dorsal margins minutely crenulated; ventral margins each with 2–4 (second, usually 2), 2 or 3 (third, usually 2) and 2 (fourth) corneous spines; distoventral margin with 2 corneous spines subequal in size. Dactyli 0.4–0.5 times as long as propodi, each terminating in curved, sharply pointed, bifurcate claws, ventral claw much larger than dorsal claw; ventral margins each with 2 small corneous spines on slightly elevated bases, distal spine larger or stouter than proximal spine. Fifth pereopod slender, chelate; propodus with numerous short simple setae and 1 or 2 subdistal hooked setae. Male with pair of gonopods on second abdominal segment; endopod elongate ovate, rounded on distal margin; exopod small, rounded. Female with no pleopods on third abdominal segment, but with well developed pleopods on fourth and fifth abdominal segments. Coloration in life. Carapace pale to reddish or greenish brown, with white, transverse lines or narrow irregular marks on dorsal surface; cardiac region with pair of dark reddish brown spots, whitish on posterior part. Chelipeds pale to greenish brown, with scattered, white and dark brown blotches on dorsal surface. Ambulatory legs white or pale brown; meri, carpi, and propodi each with dark brown blotch on respective median parts. Setae light brown (Fig. 1C, D). Distribution. Presently known only from the Ryukyu Islands (Iriomote Island and Kume Island), southwestern Japan. Habitat. Although the specimens from Kume Island were collected by dredges at depths of 4.5–7.5 m, their host animals were not recorded. Other specimens examined from Iriomote Island were obtained from parchment tubes of Chaetopterus cf. cautus Marenzeller, 1879 (Naruse et al. 2017: fig. 2A) in sand/mud substrata of the intertidal flats or depths of 2– 6 m. From intertidal to subtidal depths of 10 m in Iriomote Island, brachyuran crabs such as a hexapodid Hexapinus simplex Rahayu & Ng, 2014 and a species of the pinnotherid genus Tetrias Rathbun, 1898 (cf. Naruse 2013; Rahayu & Ng 2014; Naruse et al. 2017) were also found from the tubes of Chaetopterus cf. cautus. An ovigerous female of Polyonyx pilosibrachium n. sp. (RUMF-ZC-4385) was collected together with an ovigerous female of Hexapinus simplex from a tube of same host worm (Naruse et al. 2017: fig. 2). Etymology. The specific name is a combination of the Latin, pilosus (= with soft setae) and brachium (= arm), which refers to the carpus of each cheliped with a row of plumose setae on the dorso-anterior margin; used as a noun in apposition. Remarks. Polyonyx pilosibrachium n. sp. is morphologically closest to P. utinomii in the carapace with relatively long transverse striae on the dorso-anterior half and strongly convex on the branchial margins, the chelipeds with a broad and rounded lobe on the dorso-anterior margin of each merus and with relatively long transverse striae on the dorsal surface of each carpus. However, the new species is distinguished from P. utinomii by having a distinct row of plumose setae on the dorso-anterior margin of the carpus of each cheliped. In P. utinomii, the carpus of the cheliped lacks or has only a few shorter setae on the dorso-anterior margin. Additionally, the carapace is comparatively broader (approximately 1.4 versus 1.2–1.3 times as broad as long), the rostrum bears longer setae, and the merus of the second pereopod are proportionally more slender (2.5–2.7 versus 2.1 times as long as high) in P. pilosibrachium n. sp. than in P. utinomii (for the characters of P. utinomii, cf. Osawa 2001: figs. 4A, C, D, 6G; Osawa & Poupin 2013: fig. 3A, F; personal observation). In fresh condition, the colored marks on the dorsal surfaces of the carapace and chelipeds are usually darker and more densely distributed in P. pilosibrachium n. sp. than in P. utinomii (cf. Watanabe 2013: unnumbered fig.; present study: Fig. 1C, D). Polyonyx boucheti Osawa, 2007 also resembles P. pilosibrachium n. sp. and P. utinomii in having strongly convex branchial margins of the carapace and moderately long transverse striae on the dorsal surfaces of the carapace and carpi of the chelipeds, but their striae are comparatively weaker in P. boucheti than in the latter two species. Additionally, P. boucheti differs from P. pilosibrachium n. sp. and P. utinomii in the median lobe of the rostrum being faintly developed and nearly transverse in dorsal view (in the latter two species, it is broadly triangular and rather distinctly produced anteriorly) and the merus of each cheliped with subrectangular instead of rounded lobe on the dorso-anterior margin (cf. Osawa 2007b; Osawa & Poupin 2013). The coloration in life also distinguishes P. boucheti from P. boucheti and P. utinomii. The carapace has vermiculiform, light brown marks in P. boucheti, but such marks are absent in P. pilosibrachium n. sp. and P. utinomii (cf. Osawa 2001: fig. 7A; Watanabe 2013: unnumbered fig.; Osawa & Poupin 2013: fig. 2; present study: Fig. 1A, C, D).Published as part of Osawa, Masayuki, Naruse, Tohru & Ng, Peter K. L., 2018, New records of species of the Polyonyx sinensis group (Crustacea: Decapoda: Anomura: Porcellanidae) from Japan, the Philippines, Singapore, and Malaysia, with descriptions of two new species, pp. 303-323 in Zootaxa 4429 (2) on pages 307-312, DOI: 10.11646/zootaxa.4429.2.6, http://zenodo.org/record/128400
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