Concept
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Chordates and the Evolution of Vertebrates
Urochordates
(a) This photograph shows a colony of the tunicate Botrylloides violaceus. (b) The larval stage of the tunicate possesses all of the features characteristic of chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. (c) In the adult stage, the notochord, nerve cord, and tail disappear.
Source
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"OpenStax College, Chordates. October 17, 2013."
http://cnx.org/content/m44685/latest/Figure_29_01_03abc.jpg
OpenStax CNX
CC BY 3.0.