Oxypleurodon Miers, 1886

Takeda, Masatsune, Ohtsuchi, Naoya & Komatsu, Hironori, 2021, Crabs (Crustacea, Decapoda) from the Sea off East and Southeast Asia collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 1. Sulu Sea and Sibutu Passage, Bulletin of the National Museum of Nature and Science. Series A, Zoology 47 (2), pp. 65-97 : 88-90

publication ID	https://doi.org/10.50826/bnmnszool.47.2-65
publication LSID	lsid:zoobank.org:pub:09E0EFF3-ABE7-43D7-AA85-DA3BF08E47B9
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treatment provided by	Felipe (2024-07-17 13:48:01, last updated 2024-07-17 13:57:41)
scientific name	Oxypleurodon Miers, 1886
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Treatment

Genus Oxypleurodon Miers, 1886 View in CoL

Oxypleurodon sphenocarcinoides ( Rathbun, 1916) View in CoL

( Fig. 15F View Fig )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 11 (Sulu Sea ; 08°12.7′N, 117°59.6′E – 08°11.8′N, 117°58.5′E; 285–306 m deep); 3 m beam trawl; 26 May, 1972; 1 ˁ ( CB 7.4 mm excluding branchial tubercles; CL 11.8 mm excluding pseudorostral spines) GoogleMaps , NSMTCr 28981.

Remarks. This species was originally described from the Philippines as Chorilia sphenocarcinoides , but transferred to the genus Sphaerocarcinus by Griffin (1976), to the genus Rochinia by Griffin and Tranter (1986), and then, to the present genus, Oxypleurodon , by Tavares (1991b). The specimen examined agrees well with the original description ( Rathbun, 1916), and the later accounts (Griffin, 1976; Richer de Forges and Ng, 2009b).

Distribution. Only known from the Philippines at the depths of 200– 300 m.

Oxypleurodon wilsoni Richer de Forges and Poore, 2008 View in CoL ( Figs. 15A–D View Fig , 16 View Fig )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 20 (Sibutu Passage; 05°40.9′N, 119°46.3′E – 05°43.1′N, 119°47.0′E; 460–514 m deep); otter trawl; 10 June, 1972; 1 ˁ( Fig. 15A View Fig ) ( CB 10.6 mm excluding branchial tubercles; CL 16.9 mm excluding pseudorostral spines), NSMT-Cr 28982; 1 ˂ ( Figs. 15B, D View Fig ) ( CB 6.0 mm; CL 10.1 mm), NSMT-Cr 28983; 1 ˂ ( Fig. 15C View Fig ) ( CB 8.2 mm; CL 14.0 mm), NSMT-Cr 28984; 1 ˂ (ovig.) ( CB 9.6 mm; CL 15.5 mm), NSMT-Cr 28985 GoogleMaps .

Remarks. Our specimens generally agree with the original description, but the supraorbital plates are more strongly thickened as shown in Fig. 15A View Fig , and in our smallest specimen ( Fig. 15B, D View Fig ), the dorsal plates are not fully developed, and look more sparsely distributed.

The present species closely resembles O. luzonicum Rathbun, 1916 distributed in the West Pacific from the Kii Peninsula in the Pacific coast of central Japan to northwestern Australia ( Richer de Forges and Poore, 2008; Marumura and Takeda, 2012). According to Richer de Forges and Poore (2008), O. wilsoni is distinguished from O. luzonicum by 1) the anteriorly sharpened supraocular plate, 2) the lozengeshaped mesogastric plate, 3) the small, round and medially elevated cardiac plate, 4) the oblong, externally pointing epibranchial plates, and 5) the presence of a small tubercle between the mesogastric and hepatic spines. In addition, the following characters can be also helpful to differentiate the two species: the longer pseudorostral spines, and absence of the subhepatic plate and a tubercle among the closely gathered hepatic, subbranchial and anterior epibranchial plates. The G1 ( Fig. 16 View Fig ) also differs from the G1 drawings of O. luzonicum represented by Guinot and Richer de Forges (1985: Fig. 21C–D).

Distribution. Western Australia and the Sulu Sea; 329–514 m deep.

References

Griffin, D. J. G. and H. A. Tranter, 1986. The Decapoda Brachyura of the Siboga Expedition. Part VIII. Majidae. Siboga-Expeditie, Monographie 39 (C 4): 1 - 335.

Guinot, D. and B. Richer de Forges 1985. Revision of the Indo-Pacific Sphenocarcinus with a single rostrum and description of two new species (Crustacea, Decapoda, Brachyura, Majidae). Marine Research in Indonesia 24: 49 - 71.

Marumura, M. and M. Takeda 2012. Taxonomic studies on the crabs of the Nagai Collection preserved in the Wakayama Prefectural Museum of Natural History. III. Species new to Japan (3). Journal of Teikyo Heisei University 23: 189 - 197 (in Japanese with English summary).

Miers, E. J. 1886. Report on the Brachyura collected by H. M. S. Challenger during 1873 - 76. In: Report on the Scientific Results of the Voyage of H. M. S. Challender during the years 1873 - 1876 under the command of Captain George S. Nares, R. N., F. R. S. and the later Captain Frant Tourle Thomson, R. N. prepared under the Superintendence of the late Sir C. Wyville Thomson, Knt., F. R. S. & c. Regius Professor of Natural History in the University of Edinburgh of the civilian scientific staff on board and now of John Murray, one of the naturalists of the Expedition. Zoology, Published by

Rathbun, M. J. 1916. New species of crabs of the families Inachidae and Parthenopidae. Scientific results of the Philippine cruise of the fisheries steamer lAlbatross, z 1907 - 1910. No. 34. Proceedings of the United States National Museum 50: 527 - 559.

Richer de Forges, B. and G. C. B. Poore 2008. Deep-sea majoid crabs of the genera Oxypleurodon and Rochinia (Crustacea: Decapoda: Brachyura: Epialtidae) mostly from the continental margin of Western Australia. Memoirs of Museum Victoria 65: 63 - 70.

Richer de Forges, B. and P. K. L. Ng 2009 b. On the majoid genera Oxypleurodon Miers, 1886, and Sphenocarcinus A. Milne-Edwards, 1875 (Crustacea: Brachyura: Epialtidae), with descriptions of two new genera and five species. The Raffles Bulletin of Zoology, Supplement 20: 1247 - 266.

Tavares, M. S. 1991 b. Redefinition des genres Rochinia A. Milne Edwards, Sphenocarcinus A. Milne Edwards et Oxypleurodon Miers, et etablissement du genre Nasutocarcinus gen. nov. (Crustacea, Brachyura, Majidae). Bulletin du Museum national d`Histoire naturelle, Paris (4) (A) 13: 159 - 179.

Figures

Fig. 15. A–D: Oxypleurodon wilsoni Richer de Forges and Poore, 2008, full-grown male (A) (NSMT-Cr 28982. CB 10.6mm excluding branchial tubercles; CL 16.9mm excluding pseudorostral spines), female (B, D) (NSMT-Cr 28983. CB 6.0mm; CL 10.1mm), full-grown female (C) (NSMT-Cr 28984. CB 8.2mm; CL 14.0mm). E: Laubierinia nodosa (Rathbun, 1916), female (NSMT-Cr 28980. CB 15.0mm excluding branchial tubercles; CL 21.4mm excluding pseudorostral spines). F: Oxypleurodon sphenocarcinoides (Rathbun, 1916). Male (NSMT-Cr 28981. CB 7.4mm excluding branchial tubercles; CL 11.8mm excluding pseudorostral spines).

Fig. 16. Oxypleurodon wilsoni Richer de Forges and Poore, 2008, Right G1 of full-grown male (NSMT-Cr 28982. CB 10.6mm excluding branchial tubercles; CL 16.9mm excluding pseudorostral spines), entire length in ventral view (A) and distal part of the same in sternal view of (B). Scale bar: 1mm for A, and 0.5mm for B.