The first bifid neuropodial lobes appear on the twenty-first setigerous segment.
When the setigerous joint is larger than the preceding one, and globose.
First branchia on each side attached to second somite just in front and mesad of the first setigerous tubercle.
Dorsal cirri present in addition to branchi on the first four setigerous somites.
A characteristic feature of the species is the presence of ten setigerous thoracic somites.
Differing from the other species here described in having nine setigerous thoracic somites.
When the setigerous joint is not conspicuously larger than the preceding one.