These brachiopods have more robust shells made of calcite. All are epifaunal. Some attached themselves to rocky substrates, or to fragments of shell or pebbles in soft substrate. Others lived ...

Ventral view of Mucrospirifer, a fossil brachiopod, showing the characteristically wing-like shell. This Devonian specimen from Ohio is 3.5cm wide. Brachiopod hard parts have excellent preservation ...