Hemichordate: Difference between revisions
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All other modern forms are marine worms, commonly called [[acorn worm]]s. |
All other 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]]. The |
They are divided into two classes: the [[Enteropneusta]] and the [[Pterobranchia]]. The phylum contains less than 100 species. |
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Revision as of 07:51, 26 February 2005
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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. One surviving species is known, Cephalodiscus graptolitoides.
All other modern forms are marine worms, commonly called acorn worms. They are divided into two classes: the Enteropneusta and the Pterobranchia. The phylum contains less than 100 species.