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Stegerhynchus (mass mortality)
© 2005 Falls of the Ohio State Park
© 2004 Michigan State University Museum
© 2005 R. Weller, Cochise College
What are Brachiopods? Brachiopods are marine animals that have a calcium carbonate or calcium phosphate shell made of two valves, which usually differ in shape and size. Brachiopods are closely related to the bryozoans. Both groups possess a unique feeding and respiratory organ called a lophophore, which looks a bit like a rubber band covered with tiny hairs. Some brachiopods can cement themselves directly to hard surfaces; most have a stalk, called a pedicle, which they use to attach to a surface or to anchor themselves in the sediment of the sea floor. Brachiopods are very common fossils in Paleozoic rocks from many marine environments.
First known fossil occurrence: Cambrian.
Last known fossil occurrence: Quaternary. This group has living relatives.
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