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Brachiopod

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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the youngest known species

... around, also largely unchanged, for over 3 billion years and at one time were the Earth's dominant form of life. On the animal side of things, the brachiopod Lingula is probably the oldest, having existed nearly unchanged for over 500 million years, and the horseshoe crab (limulus) has been on ...

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by Winter
Thu Sep 29, 2005 12:53 pm
 
Forum: Zoology Discussion
Topic: the youngest known species
Replies: 4
Views: 9866


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