Platymaia bartschi Rathbun, 1916

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 : 83

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-FF98-D653-B3BA-FD11FB8DBDA4
treatment provided by	Felipe
scientific name	Platymaia bartschi Rathbun, 1916
status

Treatment

Platymaia bartschi Rathbun, 1916 View in CoL

( Fig. 13 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 young ˁ ( CB 36.1 mm; CL 34.9 mm excluding rostral spine, soft shell) GoogleMaps , NSMT-Cr 28975.

Remarks. In addition to the soft shell male recorded above, the right half of the carapace and left cheliped are in the same vial. Considering the size of the half carapace with 73.7 mm in CL and the shape of the slender cheliped, the specimen is fully developed female. Although the rostral tooth is unfortunately broken off, the specimen is safely identified as Platymaia bartschi . In the soft shell male ( Fig. 13 View Fig ), the rostral tooth is warped for its distal half, but it is clear that the main rostrum is slender and much longer than the lateral rostral teeth.

Griffin (1976) distinguished Platymaia bartschi from P. wyvillethomsoni Miers, 1886 based mainly on the Philippine specimens; in P. bartschi the inter-antennular spine is almost three times as long as the rostral spines (about twice as long as in P. wyvillethomsoni ). Griffin (1976) and Griffin and Tranter (1986) also reported develop- mental variation, namely that in juveniles the carapace bears numerous spines including six lateral branchial spines, two on each protogastric, mesogastric, cardiac, epibranchial and mesobranchial regions. Guinot and Richer de Forges (1986) finely illustrated the front-orbital details and had little doubt about the occurrence of this species in Japan.

Distribution. Philippines ( Rathbun, 1916; Griffin, 1976; Guinot and Richer de Forges, 1986), South China Sea ( Griffin and Tranter, 1986), Taiwan (Griffin, 1976), and Japan ( Sakai, 1965b, 1976), 185–592 m deep.