Ethusa latidactyla Parisi, 1914

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 : 532-533

Ethusa latidactyla Parisi, 1914

Ethusa (Ethusina) latidactyla Parisi, 1914: 305 , pl. 13, fig. 1.

Ethusina latydactyla – Ihle 1916b: 152 (list).

Ethusa latidactyla – Ihle 1916b: 139, 151 (list), 153 (list), 156 (list), figs 74, 75. — Sakai 1937: 78, 181, fig. 1b; 1956: 7 (list); 1965: 23, pl. 11, fig. 3 (colour); 1976: 64, fig. 26b, pl. 23, fig. 2 (colour). — Serène

1968: 40 (list). — Miyake 1983: 198 (list). — Chen 1985: 186, fig. 7, pl. 1, fig. 6, pl. 2, figs 3, 6; 1986: 127, fig. 9. — Nagai 1995: 60, pl. 1, fig. 5. — Muraoka 1998: 17. — Chen & Sun 2002: 54, 246, fig. 105. — Marumura & Kosaka 2003: 23.

Ethusa aff. hirsuta – Serène & Vadon 1981: 118, 119, 121.

Ethusa latidactylus – Chen 1993: 317 (key), 324, fig. 6.

Ethusa latydactyla [sic] – Serène & Lohavanijaya 1973: 34 (key).

TYPE MATERIAL. — Holotype: cl 13.5 mm, damaged, A. Owston coll., 1913 ( MCSNM 5 ; see Froglia & Grippa 1986).

The holotype is badly damaged and could not be mailed (G. Grippa pers. comm.). Photographs, however, showed the characteristic anterior margin of the carapace that is diagnostic to the species.

TYPE LOCALITY. — Japan, Honshu, Sagami Bay.

MATERIAL EXAMINED. — Japan. Kyushu, Kagoshima, Furue, 31°23’N, 130°41’E, K. Sakai coll., 200 m, 19.III.1968, 1 ( SMF 28930).

Unknown location, T. Sakai coll., 1 ( SMF 28929).

Taiwan. TAIWAN 2002, stn CP 166, 22°23.8’N, 120°15.3’E, 200 m, 26.V.2002, 1 ( NTOU).

Philippine Islands. South China Sea, MUSORSTOM 1, stn CP 2, 14°02.8’N, 120°18.8’E, 187- 182 m, 19.III.1976, 1 ( MNHN-B 18180). — Stn CP 30, 14°01.3’N, 120°18.7’E, 186- 177 m, 22.III.1976, 1 ( MNHN-B 18179). — Stn CP 32, 14°02.2’N, 120°17.7’E, 193- 184 m, 23.III.1976, 1 juv.

( MNHN-B 18178). — Stn CP 51, 13°49.4’N, 120°04.2’E, 200- 170 m, 25.III.1976, 1, 1 ( MNHN-B 18176).

MUSORSTOM 2, stn CP 41, 13°16’N, 122°46’E, 166-172 m, 25.XI.1980, 5, 1 juv. ( MNHN-B 18181). — Stn CP 64, 14°01’N, 120°19’E, 191- 195 m, 29.XI.1980, 2, 1 juv. ( MNHN-B 18175). — Stn CP 67, 14°01’N, 120°19’E, 193- 199 m, 29.XI.1980, 2, 1 juv. ( MNHN-B 18177).

MUSORSTOM 3, stn CP 87, 14°00’N, 120°19’E, 191-197 m, 31.V.1985, 1 ( MNHN-B 18017). — Stn CP 97, 14°00’N, 120°18 ’E, 189-194 m, 1.VI.1985, 1 juv. ( MNHN-B 18890). — Stn CP 98, 14°00’N, 120°18’E, 194-205 m, 1.VI.1985, 2 ( MNHN-B 18891). — Stn CP 99, 14°00’N, 120°19’E, 196-204 m, 1.VI.1985, 1 ( MNHN-B 18888). — Stn CP 100, 14°00’N, 120°18’E, 189- 199 m, 1.VI.1985, 1, 1 juv. ( MNHN-B 18884). — Stn CP 109, 14 °00’N, 120°18’E, 190- 198 m, 2.VI.1985, 1 juv. ( MNHN-B 18883). — Stn CP 111, 14°00’N, 120°18’E, 193-205 m, 2.VI.1985, 1, 1 juv. ( MNHN-B 18885). — Stn CP 112, 14°00’N, 120°18’E, 187-199 m, 2.VI.1985, 3 ( MNHN-B 18887).

Mindoro Strait, stn CP 120, 12°06’N, 121°15’E, 219- 220 m, 3.VI.1985, 2, 2 ( MNHN-B 18886). Sibuyan Sea, stn CP 139, 11°53’N, 122°14’E, 240- 267 m, 6.VI.1985, 1, 1 juv., 1 ( MNHN-B 18889).

Indonesia. Makassar Strait, CORINDON 2, stn CH 273, 01°57’S, 119°15’E, 220 m, 7.XI.1980, 1 ( MNHN-B 19073).

Lesser Sunda Islands, Siboga , stn 312, Saleh Bay, Sumbawa, 08°19’S, 117°41’E, 274 m, 14.II.1900, 1, 1 juv., 2 ( ZMA Crust.De 241694).

DISTRIBUTION. — Southern Japan (see Sakai 1976), South China Sea ( Chen 1986), Philippine Is ( Serène & Vadon 1981 [as Ethusa aff. hirsuta ], Chen 1985), Indonesia (Lesser Sunda Is [ Ihle 1916b], Makassar Strait [ Chen 1993]), and now from Taiwan. Depth: 50 ( Sakai 1976) - 274 m ( Ihle 1916b) ( Fig. 34 ).

SIZE. — Maximum size: cl 11.0 mm, cw 12.1 mm ( MNHN-B 18891), cl 14.2 mm, cw 15.8 mm ( MNHN-B 18886).

REMARKS

Ethusa latidactyla is recognizable by its broad, rounded, pear-shaped carapace, the lateral borders of which are convex and the branchial region inflated ( Sakai 1976: pl. 23, fig. 2; 1965: pl. 11, fig. 2; Chen 1985: fig. 7; 1986: fig. 9.41; 1993: fig. 6; Chen & Sun 2002: fig. 105.1). A somewhat similar shape, however, is also characteristic of E. sexdentata ( Stimpson, 1858) , from which it differs by the presence of two conspicuous vertical rows of setae on each pterygostomial region (absent in E. sexdentata ), broadly round orbital sinuses (narrow, V-shaped in E. sexdentata [ Sakai 1937: fig. 1a; 1976: fig. 26a]). Chen (1985: 189), who listed other more subtle differences between the two species, was actually comparing E. latidactyla with E. abbreviata n. s p., n o t E. s e x d e n t a t a (s e e s y n o n y m y o f E. abbreviata n. sp. above).

Differences between E. latidactyla and E. indica , another large-size species, are mentioned in the Remarks of E. indica (see above).

A specimen from MUSORSTOM 1 (Phi- lippines) identified as Ethusa aff. hirsuta by Serène & Vadon (1981) and not available for examination is possibly E. latidactyla since two specimens of this species (and of no other species of Ethusa ) were identified from the same station ( MNHN-B 18176).

Figures

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