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. |
The first bifid neuropodial lobes appear on the twenty-first setigerous segment. |
When the setigerous joint is larger than the preceding one, and globose. |
Dorsal cirri present in addition to branchi on the first four setigerous somites. |
First branchia on each side attached to second somite just in front and mesad of the first setigerous tubercle. |