Mostly marine, benthic (bottom-dwelling), and sessile (attached to the sea floor).

Only ~5% of all known brachiopod species are alive today.

Despite a significant decline following the end-Permian mass extinction, the phylum Brachiopoda demonstrates remarkable evolutionary resilience, with a 500-million-year history that highlights key Paleozoic environmental shifts and enduring, conservative lifestyles. II. Morphology and Anatomy

Abundant in shallow marine environments during the Paleozoic era.