Telson armed usually with 3 pairs of spinules
Adrostral sulcus as wide as post-rostral carina
Telson armed with 3 pairs of movable spines
Adrostral carina and groove long, extending almost to posterior margin of carapace, the groove wide
Gastrofrontal crest present
Gastrofrontal groove bifurcate posteriorly
Petasma with distomedian projection reaching to or slightly overhanging distal margin of costae,
Ventral costae largely broadened apically unarmed on their free border but incised on thier attached border
Outer surface of lateral lobes not tuberculate
Thelycum with lateral plates their anteromedian angles divergent
Anterior process with anterolateral edge raised forming 2 subtriangular or cylindrical projections
posterior process triangular, its anteior edge raised
Its lateral ridges delimiting a median depressed area
Adrostral crest and groove long, extending almost to posterior margin of carapace, the groove wide
Last abdominal segment colour bands reaching the ventral margin
Petasma with short distomedian projections, reaching or slightly overhanging distal margin of costae.
Thelycum with lateral plates, their anteromedian margins diverging, then turning in a broad arc continuous with anterolateral margins