Rostrum longer than carapace and with a basal crest of closely set teeth

Lateral margins of telson concave, apex acute and unarmed

Second pair of pereopods with small pincers

Carpus long and subdivided into more than 7 articles

Dactylus of last 3 pairs of pereopods simple and much shorter than propod.

Rostrum shorter tha carapace, without elevated basal crest

Lateral margin of telson convex, apex blunt with a pair of spines