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Cephalochordata

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

Cephalochordata (Acrania) Subphylum of Chordata, containing only Amphioxus (lancelet), probably the most primitive of living chordates, although some soft-bodied Cambrian fossils are dubiously referred to the group. Cephalochordates have a notochord extending into the head, gill slits, and segmented muscle blocks, and are thought to resemble the ancestors of vertebrates.

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AILSA ALLABY and MICHAEL ALLABY. "Cephalochordata." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 14 Nov. 2009 <http://www.encyclopedia.com>.

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