Gemascolex is a genus of annelid worms in the family Megascolecidae. Taxonomy and history. The genus "Gemascolex" and its type species "Gemascolex newmani" were described by Stanley Joe Edmonds and Barrie G. M. Jamieson in 1973. The genus appears to be closely related to "Anisochaeta" and "Spenceriella". Distribution and habitat. "Gemascolex" species are distributed primarily in South Australia, but some are also known from New South Wales and Victoria. Species. "Gemascolex" contains the following species: