Type species. Pachycerianthus multiplicatus Carlgren, 1912 (see details in Kelly & Keegan, 2000).
Diagnosis (sensu Arai, 1965). Cerianthidae with second couple of protomesenteries short and sterile. Arrangement of mesenteries in each quartette M,B,m,b (1,3,2,4), more or less distinct.
Distribution. This genus is distributed worldwide.