Macrophthalmus telescopicus (Owen, 1839)

Barnes, R. S. K., 2010, A Review Of The Sentinel And Allied Crabs (Crustacea: Brachyura: Macrophthalmidae), With Particular Reference To The Genus Macrophthalmus, Raffles Bulletin of Zoology 58 (1), pp. 31-49 : 39

The Macrophthalmus telescopicus group

This comprises: M. ceratophorus Sakai, 1969 , M. graeffei A. Milne Edwards, 1873 , M. latipes Borradaile, 1903 , M. microfylacus Nagai, Watanabe & Naruse, 2006 , M. milloti Crosnier, 1965 , M. philippinensis Serène, 1971 , M. ryukyuanus Naruse & Kosuge, 2008 , M. serenei Takeda & Komai, 1991 (‘ M verreauxi H. Milne Edwards, 1848 ’ in Barnes, 1976; 1977) and M. telescopicus ( Owen, 1839) . In these species ( Fig. 2A ), the ocular peduncles are extremely elongate so that part of, and usually all, the cornea is positioned beyond the lateral carapace margins and in several of the species the peduncle projects beyond the carapace for half its total length; the tip of peduncle also sometimes bears a terminal style projecting beyond the cornea. Other distinguishing features include: front relatively broad (breadth 13-17% that of carapace); carapace moderately broad (breadth = 1.5–1.7 × length), with three variably-developed but usually spiniform anterolateral teeth; male chela without spine near carpal joint, with short fingers and undeflexed index. A mainly sublittoral group (in depths of up to 80m), though M. milloti and M. serenei are common intertidally.

Figures

Fig. 2. Form of the carapace and adult male chela of subgroups of the genus Macrophthalmus II, the subgenus Macrophthalmus part 1: (a) M. telescopicus group, (b) M. brevis group, and (c) M. convexus group. Scale bars = 5mm.