Macrophthalmus (Macrophthalmus) abbreviatus Manning & Holthuis, 1981

Rahayu, Dwi Listyo & Nugroho, Dharma Arif, 2012, The Indonesian species of Macrophthalmus Desmarest, 1823, with the description of a new species (Crustacea: Decapoda: Brachyura: Macrophthalmidae), Zootaxa 3158, pp. 20-36 : 21-22

Macrophthalmus (Macrophthalmus) abbreviatus Manning & Holthuis, 1981

( Figs. 2A, B )

Ocypode dilatata De Haan, 1835: 55 , pl.15, fig. 2.

Macrophthalmus dilatatus dilatatus — Barnes 1970: 214, fig.3.

Macrophthalmus abbreviatus Manning & Holthuis, 1981: 201 . — Barnes 2010: 35.

Material examined. 1 male (8.00 x 15.10 mm), 1 ovig. (5.80 x 11.80) ( MZB Cru 3265), 1 male (9.60 x 19.10 mm), 1 ovig. (9.30 x 12.70 mm) ( ZRC 2011.0997), Kamora, Papua, 12.07.2001; 2 males (12.19 x 23.19 mm, 9.30 x 17.60 mm) (RCLA-C.B.0253), Kamora, Papua, 25.06.2008.

Remarks. This species is recognizable by the chelipeds having a strongly deflexed fixed finger and a slightly curved dactyl that is oriented almost vertically, leaving a wide hiatus between the fingers. These characters are shared with M. sulcatu s H. Milne Edwards, 1852. The two species are easily separated, however, by the longer exorbital angle, almost as long as the second tooth and directed forward in D. abbreviatus , whereas in D. sulcatus the exorbital angle is shorter than the second anterolateral tooth and is directed downwards. Both species are included in the Macrophthalmus brevis group (Barnes 2010).

Habitat. Muddy sandflats of seaward fringe of mangrove forests.

Geographical distribution. North China, Japan ( Tesch 1915; Barnes 1970), and herein from Papua.

Figures

FIGURE 2. A, B, Macrophthalmus (Macrophthalmus) abbreviatus Manning & Holthuis, 1981, male (12.19 x 23.19 mm) (RCLA-C. B. 0253); C, D, Macrophthalmus (Macrophthalmus) brevis (Herbst, 1804), male (8.96 x 17.60 mm) (RCLA- C. B. 0254); E, F, Macrophthalmus (Macrophthalmus) sulcatus malaccensis Tweedie, 1937, male (7.34 x 16.71 mm) (RCLA- C. B. 0278); G. H. Macrophthalmus (Macrophthalmus) parvimanus Guérin-Méneville, 1834, male (6.65 x 11.08 mm) (RCLA- C. B. 0259).