Definition of cephalochordate
: an animal of the subphylum Cephalochordata : lancelet Although cephalochordates had achieved the primary characters of chordates—notochord, dorsal hollow nerve cord, and pharyngeal gill slits—as well as a postanal tail and segmental muscles throughout the trunk and tail, they lack many other features that characterize vertebrates. — Robert L. Carroll, Patterns and Processes of Vertebrate Evolution, 1997
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First Known Use of cephalochordate
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