The incidence of the nemertine Malacobdella grossa in the bivalve Cerastoderma edule in Shetland

Abstract

Malacobdella grossa is recorded from a new host, Cerastoderma edule, and the association appears to be confined to the Shetland Islands. Infection rates were high at five of the seven sites studied and double infections were very common. The commensal population was dominated by large individuals.