Hemichordate: Difference between revisions
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'''Hemichordata''' is a [[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 fossils called [[graptolite]]s, which went extinct in the [[Carboniferous]]. Modern forms are marine worms, commonly called acorn worms. They are divided into two classes: the [[Enteropneusta]] and the [[Pterobranchia]]. |
'''Hemichordata''' is a [[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 fossils called [[graptolite]]s, which went extinct in the [[Carboniferous]]. Modern forms are marine worms, commonly called acorn worms. They are divided into two classes: the [[Enteropneusta]] and the [[Pterobranchia]]. |
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Revision as of 03:31, 15 July 2002
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, which went extinct in the Carboniferous. Modern forms are marine worms, commonly called acorn worms. They are divided into two classes: the Enteropneusta and the Pterobranchia.