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chordate

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chordate

Any member of the phylum Chordata, which includes the most highly evolved animals, the vertebrates, as well as the marine invertebrate cephalochordates (see amphioxus) and tunicates. All chordates, at some time in their life cycle, possess a dorsal supporting rod (notochord), gill slits, and a dorsal nerve cord. Unlike vertebrates, tunicates and cephalochordates lack any kind of brain or skeleton. Chordate bodies consist of a body wall encasing a gut, with a space between called the coelom. The body is usually long and bilaterally symmetrical, with the mouth and sense organs at the front end.
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These gene clusters were duplicated twice during early chordate evolution such that there are four paralogous groups.
Alternatives to toxicity testing in animals: challenges and ... by McNamee, Pauline / Environmental Health Perspectives
What makes a sea squirt a chordate is the notochord in the animal's larval stage.
Splashdown. (Letters) by Eagan, J. Roger / Science News
A little more hazily, I recall highlights of my cellular journey long before the first chordate.
The way of science by Barlow, Connie / The Humanist
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