Bathyarctus, Holthuis, 2002

Holthuis, Lipke B., 2002, The Indo-Pacific scyllarine lobsters (Crustacea, Decapoda, Scyllaridae), Zoosystema 24 (3), pp. 499-683 : 505

KEY TO THE INDO- WEST PACIFIC SPECIES OF BATHYARCTUS N. GEN.

Species dealt with in this paper are in bold.

1. Anterior margin of the sternum rounded. Upper surface of posterior half of abdominal somites I to IV with distinct tubercles on either side of the transverse groove. Median carina of fourth abdominal somite only slightly higher than that of somite III. Large species, cl. more than 20 mm ................................................................ 2

— Anterior margin of the sternum truncate or slightly concave. Upper surface of posterior half of abdominal somites I to IV practically smooth either side of the transverse groove, or with flattened indistinct tubercles. Median carina of abdominal somite IV distinctly higher than that of somite III. Small species, cl. 20 mm or less ........ 3

2. Propodus of legs 1 to 4 with a thick pad of ventral hairs .................. B. chani n. sp.

— Propodus of legs 1 to 4 without ventral hairs .................... B. formosanus n. comb.

3. Pregastric tooth distinct. Tip of median carina of fourth abdominal somite rounded in dorsal view ............................................................................ B. rubens n. comb.

— Pregastric tooth absent or visible as a low and short transverse carina. Tip of median carina of fourth abdominal somite incised in the middle, ending in two points ...... ................................................................................................ B. steatopygus n. sp.