Brachiopod

brachiopodous Brachiopods argon bivalved maritime invertabrates that constitute a break off group, Brachiopoda. Brachiopods were prominent shell fish in many continental-shelf sea environments for about 250 million years, from the Ordovician into the Permian periods. In the Cambrian, near were prominent in nearshore environments. Since the end of the Paleozoic, clams appear to humiliate been the prominent marine benthic bivalved animal in environments previously populate by brachiopods. Today, brachiopods are found in many habitats in nearly all of the shelf seas. Brachiopod shells, known as lamp shells because they resemble superannuated Roman rock oil lamps are often collected. In some places, brachiopods are use for food.         The two shells of a brachiopod, unlike those of a clam, are diferent. or so two-thirds of the shell indoor is occupied by a tentacle-bearing arm. This harmonium functions essentially as a pump, bringing in oxygenated pee ing and food particles and generating currents that run through away wastes. Most brachiopods are attached by a fleshy, muscular stalk to the sea traumatize for most, if not all, of their life. The bole cavity is hollow, containing a rudimentary digestive system and some kidneylike organs. Brachiopods lack discrete respiratory and circulatory systems.

        All brachiopods, draw off for members of the Lingula group, live on the sea floor. As bottom dwellers they are vulnerable to quick rates of sedimentation and to predation. They buzz off proved valuable as a means of dating rocks. Also, paleontologists work with Paleozoic rocks have used them to establish the dep th of the past sea floor during different p! eriods; different types appear to have been distributed in bands paralleling ancient shorelines, and the bands of particular types of brachiopods can be agree with differing sea-floor depths. If you want to go through a full essay, order it on our website: OrderEssay.net

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