Ethusina longipes Chen, 1987

Castro, Peter, 2005, Crabs of the subfamily Ethusinae Guinot, 1977 (Crustacea, Decapoda, Brachyura, Dorippidae) of the Indo-West Pacific region, Zoosystema 27 (3), pp. 499-600 : 564-565

Ethusina longipes Chen, 1987

Ethusina longipes Chen, 1987: 687 , fig. 6, pl. 2, figs D, E; 1993: 336 (key). — Ng & Ho 2003: 72 (list).

Not Ethusina longipes – Chen 2000: 428 (= E. paralongipes Chen, 1993 ).

TYPE MATERIAL. — Holotype: cl 6. 0 mm, cw 5.9 mm, Vauban , stn CH 142 ( MNHN-B 18270 ); paratypes: cl 5.8 mm, cw 5.6 mm, Vauban, trawling 142 ( MNHN-B 18362 ); cl 6.0 mm, cw 5.7 mm, Vauban, stn CH 131 ( MNHN-B 18355 ).

TYPE LOCALITY. — Madagascar, off northwest coast, 13°45.6’S, 47°34.2’E, 1250-1300 m.

MATERIAL EXAMINED. — Madagascar. Vauban, stn CH 131, 13°46’S, 47°33’E, 1490-1600 m, A. Crosnier coll., 28.II.1975, 1 paratype ( MNHN- B 18355). — Stn CH 142, 13°45.6’S, 47°34.2’E, 1250-1300 m, A. Crosnier coll., 28.II.1975, 1 holotype ( MNHN-B 18270), 1 paratype ( MNHN- B 18362).

DISTRIBUTION. — Known only from Madagascar (Chen 1987). Depth: 1250-1600 m ( Fig. 34 ).

SIZE. — Maximum size: cl 6.0 mm, cw 5.9 mm (MNHN-B 18270), unknown.

REMARKS

Diagnostic to Ethusina longipes are median frontal teeth that are large and triangular, typically forming L-shaped lateral frontal sinuses and giving the anterior border a high, crown-like appearance (Chen 1987: fig. 6a). The P2 and P3 are particularly long and slender. There are close similarities with E. paralongipes Chen, 1993 , a species known only from the western Pacific. Ethusina longipes has noticeably longer and more slender pereopods: the meri of P2 and P3 are 13.8 times longer than broad and 1.4 times the carapace length (Chen 1987: pl. 2, figs D, E) in contrast to meri of P2 and P3 10.5-10.8 times longer than broad and 1.1-1.2 times carapace length in E. paralongipes . The frontal teeth are more slender in E. longipes than in E. paralongipes and there are some differences in the morphology of the G1 (see Chen 1987: fig. 6c, d for E. longipes and Chen 1993: fig. 18d for E. paralongipes ).

Ethusina macrospina Ng & Ho, 2003 ( Fig. 33E )

Ethusina macrospina Ng & Ho, 2003: 77 , figs 8-11.

Ethusina robusta – Chen 1993: 342 (part) (not E. robusta ( Miers, 1886)) .

TYPE MATERIAL. — Holotype: cl 7. 7 mm, cw 7.6 mm, TAIWAN 2001, stn CD 135 ( NTOU); paratypes: cl 9.4 mm, cw 9.7 mm, same station as holotype ( NTOU); cl 9.0 mm, cw 8.8 mm, same station as holotype ( ZRC 2003.0228 ); cl 10.0 mm, cw 10.0 mm, TAIWAN 2001, stn CD 134 ( NTOU); cl 7.2 mm, cw 7.3 mm, TAIWAN 2001, stn CD 141 ( ZRC 2003 .0229); 1 cl 10. 9 mm, cw 11.0 mm, TAIWAN 2000, stn CP 38 ( ZRC 2003.0227 ).

TYPE LOCALITY. — Taiwan, off southwestern coast, 22°17.21’N, 120°00.28’E, 961-1112 m.

MATERIAL EXAMINED. — Taiwan. TAIWAN 2000, stn CP 38, 22°31.1’N, 120°48.1’E, 1314-1317 m, 31.VII.2000, 1 paratype ( ZRC 2003.0227), 1, 1 ( MNHN-B 28825).

TAIWAN 2001, stn CP 135, 22°17.21’N, 120°00.28’E, 961-1112 m, 22.XI.2001, 1 holotype ( NTOU), 1 paratype ( NTOU), 1 paratype ( ZRC 2003.0228). — Stn CD 134, 22°16.56’N, 120°06.11’E, 736-1040 m, 22.XI.2001, 1 paratype ( NTOU). — Stn CD 141, 22°12.04’N, 119°59.96’E, 1110- 985 m, 24.XI.2001, 1 paratype ( ZRC 2003.02229).

TAIWAN 2002, stn CP 179, 22°21.22’N, 119°54.78’E, 1212- 1063 m, 25.VIII.2002, 2, 1 ( NTOU). — Stn CD 189, 21°39.91’N, 118°20.94’E, 1649- 1629 m, 27.VIII.2002, 1, 1 ovig. ( NTOU). — Stn CD 191, 21°41.04’N, 118°21.95’E, 1630- 1623 m, 28.VIII.2002, 1 ( NTOU).

TAIWAN 2003, stn CD 203, 22°00.2’N, 120°28.31’E, 635-868 m, 29.V.2003, 1 ( NTOU).

Philippine Islands. South China Sea, ESTASE 2, stn CP 02, 14°05.28’N, 120°02.17’E, 1980- 1960 m, 14.XI.1984, 1 ( MNHN-B 19078).

Solomon Islands. Stn CP 1755, 08°58.2’S, 159°41.6’E, 1288-1313 m, 26.IX. 2001, 1 ( MNHN-B 28715), 1 ovig. ( MNHN-B 28696).

DISTRIBUTION. — Known from Taiwan ( Ng & Ho 2003) and now from the Philippine Is and Solomon Is. Depth: 635-1980 m ( Fig. 34 ).

SIZE. — Maximum size: cl 7.7 mm, cw 7.6 mm ( NTOU), cl 12.4 mm, cw 13.2 mm ( MNHN-B 28696).

REMARKS

Diagnostic to Ethusina macrospina is conspicuous, needle-like outer orbital teeth that reach as high as or, as in most specimens, higher than the orbital teeth ( Ng & Ho 2003: figs 8, 9, 10A). It has relatively short P2 and P3 ( Fig. 33E ; Ng & Ho 2003: figs 8, 10B).

Figures

FIG. 34. — Bathymetric distribution of Indo-West Pacific ethusine crabs.

FIG. 33. — A, Ethusa granulosa Ihle, 1916, cl 14.7 mm, cw 14.6 mm, Vanuatu, west coast of Malekula, MUSORSTOM 8, stn DW 1061, 458-512 m (MNHN-B 28698) (photograph by J.-L. Menou, IRD, Nouméa); B, Ethusa hawaiiensis Rathbun, 1906, cl 6.7 mm, cw 6.2 mm, Vanuatu, S of Anatom, MUSORSTOM 8, stn CP 963, 400-440 m (MNHN-B 28538) (photograph by J.-L. Menou, IRD, Nouméa); C, Ethusa indica Alcock, 1894, cl 7.8 mm, cw 7.8 mm, Vanuatu, SE of Éfaté, MUSORSTOM 8, stn CP 1036, 920-950 m (MNHN-B 28560) (photograph by J.-L. Menou, IRD, Nouméa); D, Ethusina challengeri (Miers, 1886), cl 25.9 mm, Mid-Indian Basin, SAFARI 2, stn 35, trawl CP 29, 4950-4928 m (MNHN-B 28697) (photograph by P. Briand, IFREMER); E, Ethusina macrospina Ng & Ho, 2003, cl 10.4 mm, cw 11.0 mm, Taiwan, off southwest coast, TAIWAN 2003, stn CD 203, 635-868 m (NTOU) (photograph by T.-Y. Chan, NTOU).