Glycymeris aspersa, common name the clothed bittersweet, is a species of saltwater clam, a marine bivalve mollusc in the family Glycymerididae, the bittersweets.

Glycymeris aspersa has a shell that reaches a diameter of 36 – 46 mm.

It is a sturdy shell, nearly circular in outline and rather flattened.

In life the external surface is often partially clothed in a very dense brown periostracum.

This species can be found in the East and South China Seas,[4] as well as around Japan.