Ethusina saltator, Ng & Ho, 2003

Ng, Peter K. L. & Ho, P. - H., 2003, On The Deep-Water Dorippid Crabs Of The Genus Ethusina Smith, 1884 (Crustacea: Decapoda: Brachyura) From Taiwan, Raffles Bulletin of Zoology 51 (1), pp. 71-85 : 81-85

Ethusina saltator , new species

( Figs. 14 , 15 )

Material examined. – Holotype – male, 5.9 by 6.8 mm ( NTOU), Station CD 139, 22º10.73’N, 120º14.1’E, 852- 718 m, coll. TAIWAN 2000, R. V. “Fishery Researcher 1”, 23 Nov.2001.

Diagnosis. – Carapace longer than broad; dorsal surface gently convex, appearing almost smooth without magnification, regions poorly defined. Front not prominently projecting anteriorly, with 4 sharp teeth; median teeth short, about half length of lateral teeth, separated by distinct concavity; lateral teeth directed slightly obliquely outwards, separated from median teeth by concavity. External orbital spine acutely triangular, directed obliquely outwards, tip reaching just beyond bases of median frontal teeth. Lateral carapace margins gently sinuous, with posterior part distinctly convex. Posterior carapace margin gently concave. Chelipeds subequal; fingers slightly longer than palm; cutting edges with low teeth, outer surface of fingers with low carinae. P2 and P3 smooth, glabrous; P3 longest, merus 10.2 times as long as wide, propodus 8.3 times as long as wide; dactylus very elongate. Male abdomen with segments 3-5 completely fused; segment 6 rectangular, broader than long, lateral margins slightly sinuous; telson almost semicircular. G1 stout, medially twisted, terminal segment vaguely demarcated from subterminal part, tip prominently bifurcated; G2 with distal segment much longer than basal segment.

Etymology. – The name is derived from the Latin for dancer, alluding to the long legs of the species. The name is used as a noun in apposition.

Remarks. – With regards to the carapace form and long, slender P2 and P3, E. saltator , new species, resembles E. desciscens Alcock, 1896 , E. longipes Chen, 1987 , E. paralongipes Chen, 1993 , E. gracilipes ( Miers, 1886) and E. taiwanensis , new species. However, it can immediately be distinguished from these species by its inner median spine being much shorter than the lateral spine. In addition, the G1 of E. saltator is medially twisted, and the tip is prominently clefted medially.

ACKNOWLEDGEMENTS

The authors are grateful to Chan Tin-Yam of the National Taiwan Ocean University for making available the present specimens for study. The study has been partially supported by a travel grant to the second author from the Raffles Museum and the Marine Education Foundation of the National Museum of Marine Biology and Aquarium. Chen Hui-Lian (IOCAS) kindly referred her specimen of Ethusina to the first author for this study and read through the manuscript. The first author’s visit to Qingdao was sponsored by IOCAS through the kind courtesy of Liu Riu-Yu. The cruise of “ TAIWAN 2000” was supported by the Taiwan Fisheries Research Institute (TFRI), National Science Council, Taiwan, R.O.C. (NSC), Muséum national d’Histoire naturelle, Paris (MNHN) and the IRD (Institut de Recherche pour le Développement, France). The cruise of “ TAIWAN 2001” was supported by the National Museum of Marine Science & Technology (Keelung), NSC, MNHN and IRD. We are also grateful to the incisive but very helpful comments from two anonymous reviewers which have improved the paper substantially. Peter Castro, who is now starting a revision of the Ethusinae , offered many helpful suggestions.

LITERATURE CITED

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Figures

Fig. 14. Ethusina saltator, new species. Holotype male, 5.9 by 6.8 mm (NTOU). A, overall view; B, carapace.

Fig. 15. Ethusina saltator, new species. Holotype male, 5.9 by 6.8 mm (NTOU). A, carapace; B, right P2; C, right P5; D, dactylus and propodus of right P5; E, left chela; F, male abdominal segments 3-6 and telson (3-5 fused); G, H, I left G1 (various views) (setae denuded); J, left G2. Scales: A-C, E = 2.0 mm; F = 1.0 mm; D, G-J = 0.5 mm.

Fig. 1. Ethusina dilobotus Chen, 1993. Male, 8.0 by 8.2 mm (NTOU). A, overall view; B, carapace.