Lilljeborg, 1860
Description:
Size varies greatly with that of the host, 2.5-26 mm in length. White. Originally circular, eventually elongate cylindrical with a terminal small mantle opening. A wide stalk about two-thirds of length from the mantle opening. Larvae hatch as cyprids.
Habitat:
On the abdomen of the host, usually on the left side. Recorded hosts include Pagurus bernhardus and Pagurus pubescens . Up to 3% of the hosts are infected. Half of these with only one, otherwise up to 10 specimens on a single host.
Distribution:
A northern distribution.