Biarctus, Holthuis, 2002

Holthuis, Lipke B., 2002, The Indo-Pacific scyllarine lobsters (Crustacea, Decapoda, Scyllaridae), Zoosystema 24 (3), pp. 499-683 : 629

Genus Biarctus n. gen.

TYPE SPECIES. — Arctus sordidus Stimpson, 1860 by present designation.

OTHER SPECIES. — Biarctus dubius ( Holthuis, 1963) n. comb., B. pumilus (Nobili, 1906) n. comb., B. vitiensis (Dana, 1852) n. comb.

ETYMOLOGY. — From the Latin bi (= two) and the generic name Arctus De Haan, 1849 , referring to the fact that the median line of the carapace shows only two teeth before the cervical groove.

DIAGNOSIS. — Carapace with only two median teeth before the cervical groove: the rostral and the gastric teeth. Abdomen without median carina. Somites II to V with a distinct arborescent pattern of narrow and deep grooves. Abdominal pleura directed down, bluntly rounded at the top. Fourth segment of antennal peduncle with only a distinct sharp oblique carina on the upper surface, no additional carinae present. Thoracic sternum ending anteriorly in two teeth separated by a sharp V-shaped incision, without any tubercles on the margin of that incision. P.2 with dactylus and propodus elongate, dactylus about twice as long as dactylus of P.4. In none of the last four legs the propodus is conspicuously widened and compressed. First abdominal somite usually with a dark rounded median spot.