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
persistent identifier	https://treatment.plazi.org/id/03CF87EE-FF9D-D658-B075-FA73FC34B8D1
treatment provided by	Felipe
scientific name	Oxypleurodon Miers, 1886
status

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.