Abstract
A new monotypic genus, Bivalvopagurus, is described for Sympagums sinensis (de Saint Laurent), a species of Parapaguridae known so far only from the China Sea. The new genus is distinguished from other genera in the family by the presence of paired pleopods in both sexes, calcification of the shield, posterior carapace, and tergites of the first two abdominal somites, and symmetry of the uropods and telson. The only species in the new genus commonly uses a bivalve shell with an actinian as means of partially protecting its abdomen. This species is redescribed and illustrated, and some evolutionary comments are made.
