Epipod present on the first three pairs of pereopods

Telson armed with 4 pairs of minute lateral movable spines

The penultimate pair the largest

Petasma with long, horne-like distomlateral projections directed laterally

Their tips slightly curving forward

Distomedian projections small curved ventrally

In females, anterior plate of thelycum with strongly raised anterior and lateral margins distally pointed

Posterior plate also with strongly raised lateral margins, the whole making a widely concave armchair-like structure

Epipod present on third pereopod only

Telson armed with a pair of subapical, small, movable spines and 2 or 3 pairs of spinules.

Petasma with very broad distolateral projections, their tips curving forward in a broad sweep and than inward;

Distomedian projections small, curved ventraly.

The anterior plate of thelycum flat or slightly concave, rounded distally and with a posterior rounded projections which can be very prominent and is often fused to posterior plate

Posterior rounded projections small, curved ventrally

Petasma with broad wing-like distolateral projections, directed laterally and curved dorsoventrally

Distomedian projections small, curved ventrally

in females, anterior plate of thelycum concave anteriorly, with a middle groove posteriorly and a bluntly pointed anterior margin

Posterior plate notched anteromedially