Acrotretida

The Acrotretida are a group (order) of sessile, suspension-feeding brachiopods known from the Cambrian period and surviving until the present day. Their shell has a round outline, and is usually phosphatic in recent specimens. They contain the sole superfamily Acrotretoidea.

Acrotretida

The Acrotretida are a group (order) of sessile, suspension-feeding brachiopods known from the Cambrian period and surviving until the present day. Their shell has a round outline, and is usually phosphatic in recent specimens. They contain the sole superfamily Acrotretoidea.