Hemichordate: Difference between revisions
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'''Hemichordata''' is a [[Phylum (biology)|phylum]] of [[deuterostome]] [[animal]]s, generally considered the sister group of our own, the [[Chordate]]s. They date back to the Lower or Middle [[Cambrian]] and include an important class of [[Fossil|fossils]] called [[graptolite]]s, which |
'''Hemichordata''' is a [[Phylum (biology)|phylum]] of [[deuterostome]] [[animal]]s, generally considered the sister group of our own, the [[Chordate]]s. They date back to the Lower or Middle [[Cambrian]] and include an important class of [[Fossil|fossils]] called [[graptolite]]s, most of which became extinct in the [[Carboniferous]] (there is one known [[Cephalodiscus graptolitoides|surviving species]]). |
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Modern forms are marine worms, commonly called acorn |
Modern forms are marine worms, commonly called [[acorn worm]]s. |
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They are divided into two classes: the [[Enteropneusta]] and the [[Pterobranchia]]. |
They are divided into two classes: the [[Enteropneusta]] and the [[Pterobranchia]]. |
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Revision as of 15:08, 7 April 2004
Hemichordata is a phylum of deuterostome animals, generally considered the sister group of our own, the Chordates. They date back to the Lower or Middle Cambrian and include an important class of fossils called graptolites, most of which became extinct in the Carboniferous (there is one known surviving species).
Modern forms are marine worms, commonly called acorn worms.
They are divided into two classes: the Enteropneusta and the Pterobranchia.