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When feeding, protrudes its anterior (front) end above the mud and arranges its setae (bristle-like structures) into three tubes.
These channel the water into lateral incoming and medial, or central, outgoing currents.
The free-swimming stage of the articulate brachiopods (whose valves articulate by means of teeth and sockets) lasts only a few days, but that of the inarticulates may last a month or six weeks.
Members of this phylum first appeared rather early in zoological history.
It is possible, by means of fossil representatives, to survey their evolution from the Cambrian Period (about 542 million years ago) to the present.
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.
The valves, of unequal size, are bilaterally symmetrical; i.e., the right and left sides are mirror images of one another.
Brachiopods (from the Greek words meaning “arm” and “foot”) are commonly known as lamp shells because they resemble early Roman oil lamps. Although no longer numerous, they were once one of the most abundant forms of life.
Most modern brachiopods are yellowish or white, but some have red stripes or spots; others are pink, brown, or dark gray.
The tongue-shaped shells ( Today, brachiopods, numbering about 300 species representing 80 genera, are abundant only locally.
Lamp shells, also called brachiopod, any member of the phylum Brachiopoda, a group of bottom-dwelling marine invertebrates.Tags: Adult Dating, affair dating, sex dating