Petrarctus, Holthuis, 2002

Holthuis, Lipke B., 2002, The Indo-Pacific scyllarine lobsters (Crustacea, Decapoda, Scyllaridae), Zoosystema 24 (3), pp. 499-683 : 528

Genus Petrarctus n. gen.

TYPE SPECIES. — Scyllarus rugosus H. Milne Edwards, 1837 by present designation.

OTHER SPECIES. — Petrarctus brevicornis ( Holthuis, 1946) n. comb.; P. demani ( Holthuis, 1946) n. comb.; P. veliger n. sp.

ETYMOLOGY. — From the Greek word petra, rock and the generic name Arctus De Haan, 1849 in reference to the very solid, knobby, stone-like body of the species of this genus.

DIAGNOSIS. — Body very solid. Carapace with gastric and cardiac teeth.Rostrum without tooth but with a small dorsal tubercle; pregastric tooth absent or replaced by a weak transverse carina or a transverse row of tubercles.Abdomen with longitudinal median carina on somites II to V. Dorsal surface of somites II to V with a wide transverse median groove before and behind which there are tubercles or ridges, but there is no arborescent pattern of very narrow grooves. Fourth antennal segment with a single oblique dorsal carina, sometimes with an additional row of tubercles. Thoracic sternum anteriorly U-shaped with a narrow median incision, the latter sometimes very indistinct. No teeth or spines on the posterior margin of the sternum.