Glycymeris


Glycymeris, common name the bittersweet clams, is a genus of saltwater clams, marine bivalve molluscs in the family Glycymerididae.

Etymology

The genus name comes from the Ancient Greek word glykymaris and Meris ), a word which is only recorded once in Greek literature.

Fossil records

These clams are very common as fossils, from the Cretaceous period in the Valanginian age. Fossil shells of these molluscs can be found all over the world. Genus Glycymeris includes about 100 extinct species.
of Italy

Description

The shells are generally biconvex, with equal valves round in outline, and slightly longer than wide. Their size varies from medium to large. The external ligament lacks transverse s. These clams are a facultatively mobile infaunal suspension feeders.

Habitat

They are widespread on shallow seabeds that consist of heterogeneous-grained sediments.

Species

Species within this genus include: