4, see text Glycymeridae Glycymerididae, often misspelled as Glycymeridae, common names dog cockles or bittersweets, is a worldwide family of salt water clams, marine bivalve mollusks in the order Arcida.

In this family the shell is generally round in outline and is slightly longer than it is wide.

While Newton was the first to publish this name, Dall (1908) had previously established the subfamily Glycymerinae [sic], which gives him priority for the family name under Article 36 of ICZN.

The name comes from the Ancient Greek word glykymaris (perhaps from γλυκύς glykýs "sweet" and μέρος méros "part"), a word which is only recorded once in Greek literature.

This change remains somewhat controversial, however the present name has become more widely used since 1969.