A chordate is an animal belonging to the phylum Chordata; they possess a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, and a post- anal tail, for at least some period of their life cycle. Chordates are deuterostomes, as during the embryo development stage the .... However, all tunicate larvae have the standard chordate features, including ...
3, An animal that retains its chordate features throughout life is the _____. ... What structure shown in the adult sea squirt in Figure 29-5 indicates it's a chordate?
Apr 19, 2012 ... The animal's digestive tract form from the ______. ... An animal that retains its chordate features throughout life is the _____.
... derived characteristics of chordates distinguish them from their ancestors: ... these characteristics need not be retained throughout life for an animal to be ...
Most chordate features disappear at metamorphosis. ... They spend their entire lives in the open sea. ... Free-swimming tunicates are found throughout the oceans as plankton, while sessile forms ... Reproduction and life cycle ... but often embryos are retained in the female's atrium or elsewhere until the larva is developed.
Animals in the phylum Chordata share four key features: a notochord, a dorsal ... The notochord provides skeletal support, gives the phylum its name, and develops ... acts as the primary axial support of the body throughout the animal's lifetime. ... The Cambrian Explosion of Animal Life, and Characteristics of Vertebrates.
As the name implies, at some time in the life cycle a chordate possesses a ... (A characteristic feature may be present only in the developing embryo and ... Vertebrates retain traces of a feeding apparatus like that of tunicates and cephalochordates. .... Lancelets move rapidly through the substrate, and their well-developed ...
Nov 28, 2013 ... Although it is not known with certainty what caused their extinction, a great deal is known ... acts as the primary axial support of the body throughout the animal's lifetime. ... In chordates, four common features appear at some point during ... Adult lancelets retain the four key features of chordates: a notochord, ...
Table of Contents. Evolutionary History of Animal Groups | Deuterostomes and Protostomes | Phylum Echinodermata .... All chordates at sometime during their life history have: ... Lancelets retain the three chordate characteristics as an adult.