Some fossil forms had internal cavities that may have served as brood chambers.
The egg develops into a free-swimming larva that settles to the bottom.
More than 35 percent occupy waters deeper than 100 fathoms, and a few live in the abyss down to more than 6,000 metres (about 20,000 feet).
lives from the tidal zone to 23 fathoms (about 42 metres [138 feet]).
The east and west coasts of the North Atlantic Ocean are sparsely occupied by brachiopods; the waters around the British Isles contain a few species, and a few genera live in the Mediterranean Sea.
The West Coast of the United States and Hawaii have a number of brachiopod species, and the coasts of Chile and Argentina have a considerable variety, including the largest living species.
Other than their usefulness in dating geological periods, members of this phylum have no economic value, except as curios and museum pieces.They are commonly tongue-shaped and oval lengthwise and in cross section.The surface may be smooth, spiny, covered with platelike structures, or ridged.lives in mud or sand and is attached at the bottom of its burrow.Brachiopods feed by opening the shell and bringing in food-bearing currents by lashing of the cilia (hairlike structures) attached to the filaments of the filters food particles from the seawater.In parts of the Antarctic they outnumber all other large invertebrates.