Ethusa minuta Sakai, 1937

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 : 536-537

Ethusa minuta Sakai, 1937

Ethusa minuta Sakai, 1937: 77 (key), 81, figs 1e, 5, pl. 11, fig. 2; 1956: 7 (list), fig. 8.5; 1965: 23, pl. 11, fig. 4 (colour); 1976: 66, fig. 26e, pl. 23, fig. 4 (colour). — Serène 1968: 40 (list). — Takeda & Miyake 1970: 210; 1972: 68. — Serène & Lohavanijaya 1973: 35 (key). — Miyake 1983: 199 (list). — Dai et al. 1986: 52, fig. 27(1-2), pl. 6, fig. 3. — Dai & Yang 1991: 58: fig. 27(1-2), pl. 6, fig. 3. — Chen 1986: 131, fig. 12(55-58); 1993: 318 (key), 329, fig. 10; 2000: 427 (part). — Nagai 1995: 61,

pl. 1, fig. 9. — Muraoka 1998: 17. — Takeda 2001: 225, 254, 259. — Chen & Sun 2002: 54, 245, fig. 104. — Marumura & Kosaka 2003: 23.

TYPE MATERIAL. — Holotype:, Japan, Honshu , Sagami Bay, between Ito and Hatsu Shima, Misago, 80 m, VI.1934. Deposit unknown.

TYPE LOCALITY. — Japan, Honshu, Sagami Bay, between Ito and Hatsu Shima, 80 m.

MATERIAL EXAMINED. — Japan. Honshu, Sagami Bay, Kannonzuka-dasi and Amadaiba banks, 35°13’N, 139°33’E, 60-65 m, Hatagumo, T. Sakai and Emperor Hirohito coll., 22.VII.1957, 1 ( SMF 28933). — Sagami Bay, WSW of Joga Shima island, 300 m, T. Sakai and Emperor Hirohito coll., 13.III.1964, 1 ( SMF 28925).

Philippine Islands. Bohol, Balicasag I., off Panglao I., tangle nets of local fishermen, XI.2003, 3, 1 ( ZRC). — Maribohoc Bay, tangle nets, 100-300 m, T. J. Arbasto coll., XI.2003 - IV.2004, 1 ( ZRC). — Off Panglao I., tangle nets, 29.V.2004, 1 ( ZRC).

PANGLAO 2004, stn T10, Panglao I., San Isidro, 9°33.386’N, 123°49.627’E, 117-124 m, 15.VI.2004, 2 ( ZRC).

Indonesia. Moluccas, RUMPHIUS EXPEDITION II, Ambon, dredging, 15-20 m, R. Serène coll., 9.I.1975, 2 ( MNHN-B 20196).

Kai Islands, MARIEL KING MEMORIAL EXPEDI- TION, stn KRVII/113, 05°32’S, 132°46’E, 33-37 m, 11.VI.1970, 1 ( MNHN-B 19085).

Chesterfield-Bellona Plateau. CHALCAL 1, stn DC10, 20°36.09’S, 161°05.82’E, 87 m, 15.VII.1984, 2 ( MNHN-B 19066). — Stn DC 53, 21°19.50’S, 158°55.30’E, 60 m, 24.VII.1984, 1 ( MNHN-B 28532).

CORAIL 2, stn DW 21, 20°36.14’S, 161°81.75’E, 86 m, 22.VII.1988, 1 ( MNHN-B 28529).

Vanuatu. MUSORSTOM 8, stn CP 1071, 15°36.63’S, 167°16.34’E, 180-191 m, 4.X.1994, 1 ( MNHN-B 27507).

New Caledonia. LAGON, stn 402, 22°33 ’S, 167°17’E, 40 m, 23.I.1985, 1 ( MNHN-B 28531). — Stn 535, 19°11’S, 162°25’E, 46 m, 6.III.1985, 1 ( MNHN-B 28585). — Stn 572, 22°52’S, 167°00’E, 65 m, 17.VII.1985, 1 ( MNHN-B 28535). — Stn DW 1155, 19°09.3’S, 162°15.9’E, 48 m, 30.X.1989, 1 ( MNHN-B 28533). — Stn DW 1163, 19°11.3’S, 163°21.9’E, 48 m, 30.X.1989, 2 ( MNHN-B 28534).

MUSORSTOM 4, stn DW 149, 19°07.6’S, 163°22.7’E, 155 m, 14.IX.1985, 1 ovig. ( MNHN- B 28530).

DISTRIBUTION. — Japan (see Sakai 1976), East China Sea ( Takeda & Miyake 1970), Indonesia ( Moluccas and Kai Is [ Chen 1993]), Vanuatu ( Chen 2000), Chesterfield Is ( Chen 1993), New Caledonia ( Chen 1993), and now from the Philippine Is. Depth: 15- 300 m ( Fig. 34 ).

SIZE. — Maximum size: cl 6.5 mm, cw 5.2 mm ( Sakai 1937), cl 9.0 mm, cw 9.0 mm ( Takeda & Miyake 1970).

REMARKS

Ethusa minuta is close to E. izuensis Sakai, 1937 . Differences between the two species are outlined in the Remarks of E. izuensis (see above).

A colour photograph of a dead but freshly collected specimen of E. minuta from the Philippine Islands ( ZRC) shows pink pereopods and pink to tan dorsal carapace.

The placement of a reference to E. izuensis (“ Chen 1985: 193, figs 11, 12, p. 1 fig. 2”) among the references for E. minuta ( Chen 2000: 427) must have been a mistake and not an implication that both species are synonymous.

Ethusa minuta is characteristic of depths typically less than 100 m ( Fig. 34 ), lower than in most species of Ethusa .

Figures

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