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Brachiopods

Brachiopod

a phylum of invertebrate animals often grouped with two other phyla under the name Lophophorates. General characteristics include: a pair of protective shells (giving them a superficial resemblance to the bivalves - i.e. Clams), a stalk protruding from the rear called a pedicle which anchors the animal to the sea floor, and a lophophore (a ridge with many tiny tentacles on it, used to catch food particles floating by). Brachiopod shells come in many different shapes and sizes. Brachiopods were extremely abundant during the paleozoic era (both in terms of numbers of individuals and numbers of species), but were practically wiped out around 300 million years ago during the permian mass extinction.Compare gastropod


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Re: Theories - Origin of Life

Canolan Thank you for unlocking this thread. Whether it's humans, Trilobites, Brachiopods or any other form of life,there is no scientific answer. There are only hypotheses. However from the evidence of the Cambrian strata complex multi=celled creatures first appeared ...

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by scottie
Thu Nov 10, 2011 4:22 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 907226

Theories - Origin of Life

... all vertebrates, some insects and mollusks in the blood protein is present ferric iron, but because their blood has a red color. Blood clam brachiopods contains hemerythrin - it contains iron to five times more than the hemoglobin. Oxygenated blood hemerythrin gives a purple hue, and gave ...

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by LeoPol
Mon Oct 10, 2011 8:30 am
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 907226


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