ghost shrimp) of the families Callianassidae and Upogebiidae, or from water collected from their burrows.

Clausidium adhere tenaciously to the host, moving easily over the surface, appendages and into the gill chamber.

[3] They are occasionally observed swimming free of the host; however, this behavior is uncommon.

The unique identifying features seem correlated with the two behaviors of adhesion to the host and the male prehension on the female.

Folds and projections on the anal segment of the female apparently complement the structure of the male maxilliped.