Cyrtomaia horrida 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 : 82

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	Cyrtomaia horrida Rathbun 1916
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Cyrtomaia horrida Rathbun 1916 View in CoL

( Figs. 12A–C View Fig )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 12 (Sulu Sea ; 08°19.0′N, 118°09.1′E – 08°18.7′N, 118°08.5′E; 495–500 m deep); 3 m beam trawl; 26 May, 1972; 1 ˁ( Fig. 12A View Fig ) ( CB 15.2 mm excluding branchial spines; CL 15.0 mm excluding pseudorostral spines), NSMT-Cr 28972; 1 ˁ ( Fig. 12B–C View Fig ) ( CB 9.0 mm; CL 8.3 mm), NSMT-Cr 28973 GoogleMaps .

Remarks. Among the known species of the genus Cyrtomaia , the taxonomic validity and status of C. horrida pilosa Ihle and Ihle-Landenberg, 1931 known only by the holotype from the Kei Islands, has been long discussed. It was considered as synonymous with C. horrida by Griffin (1976), but Guinot and Richer de Forges (1982) examined the holotype and tentatively elevated this taxon to the full species. Later, Guinot and Richer de Forges (1986) and Griffin and Tranter (1986) also considered it as a synonym of C. horrida . Recently, however, Richer de Forges and Ng (2007), who examined a long series of the specimens from the Bohol Sea, confirmed that the females of C. horrida are somewhat more pilose than the males especially in the small specimens, and decidedly synonymized C. horrida pilosa with C. horrida . At present, the genus Cyrtomaia is comprised of 29 species from the Indo-Pacific waters ( Richer de Forges and Ng, 2007, 2009a; Ng et al., 2008).

In the specimens at hand, all the chelipeds and ambulatory legs are missing, but the spinulation of the carapace surface agrees well with the description and figures by Guinot and Richer de Forges (1982: Fig. 24, as? Cyrtomaia pilosa ), though the carapace ( Fig. 12A–B View Fig ) is not pilose as in the holotype. They also agree essentially with the description by Guinot and Richer de Forges (1982), though the G1 may be not fully developed and rather similar to that of C. suhmi Miers, 1886 in general structure. According to Griffin and Tranter (1986), C. suhmi , C. smithii Rathbun, 1893 and C. owstoni Terazaki, 1903 have a slen- der simple type of the G1.

Distribution. West Pacific from Japan to the Solomon Islands through the Philippines, the South China Sea and Indonesian waters; 24–787 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 1982. Revision du genre Indo-Pacifique Cyrtomaia Miers, 1886: Campagnes Oceanographiques du Challenger, de l`Albatross, du Siboga et du Vauban (Crustacea Decapoda Brachyura). Annales de l`Institut Oceanographique, Paris 58: 5 - 87.

Guinot, D. and B. Richer de Forges 1986. Crustaces Decapodes: Majidae (genres Platymaia, Cyrtomaia, Pleistacantha, Sphenocarcinus et Naxioides). Resultats des campagnes MUSORSTOM. I & II. Philippines, Tome 2. Memoires du Museum national d`Histoire naturelle, Paris (A) 133: 83 - 177.

Ihle, J. E. W. and M. E. Ihle-Landenberg 1931. Uber einige Tiefsee-Brachyuren der Siboga-Expedition aus der Gruppe der Oxyrhyncha. Zoologischer Anzeiger 93: 147 - 163.

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

Ng, P. K. L., D. Guinot and P. J. F. Davie 2008. Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world. The Raffles Bulletin of Zoology, Supplement 17: 1 - 286.

Rathbun, M. J. 1893. Scientific results of explorations by the U. S. Fish Commission Steamer Albatross. No. XXIV. Descriptions of new genera and species of crabs from the west coast of North America and the Sandwich Islands. Proceedings of the United States National Museum 16: 223 - 260.

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 P. K. L. Ng 2007. Notes on deep-sea spider crabs of the genus Cyrtomaia Miers, 1886, from the Philippines (Crustacea; Decapoda: Brachyura: Majidae), with description of a new species. The Raffles Bulletin of Zoology, Supplement 16: 55 - 65.

Richer de Forges, B. and P. K. L. Ng 2009 a. New records of deep-sea spider crabs of the genus Cyrtomaia Miers, 1886, from the Pacific Ocean, with description of a new species (Crustacea: Decapoda: Brachyura: Majidae). Zootaxa 1861: 17 - 28.

Terazaki, T. 1903. Nihon Kanirui Tsusetsu [Overview of Japanese crabs]. No. 15. Dobutsugaku Zasshi [Zoological Magazine], Tokyo 15: 234 - 241 (in Japanese).

Figures

Fig. 12. A–C: Cyrtomaia horrida Rathbun, 1916, male (A) (NSMT-Cr 28972. CB 15.2mm excluding branchial tubercles; CL 15.0mm excluding pseudorostral spines), male (B–C) (NSMT-28973. CB 8.3mm; CL 9.0 mm). D–E: Cyrtomaia largoi Richer de Forges and Ng, 2007, female (D) (NSMT-Cr 28974. CB 22.7mm; CL 20.9mm excluding pseudorostral spines), male (E) (NSMT-Cr 28991. CB 7.7mm; CL 8.3mm). F: Platymaia remifera Rathbun, 1916, female (NSMT-Cr 28977. CB 31.6mm; CL 28.7mm including rostral spine).