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Characteristics of Phylum Chordata




1.- Bilateral symmetry; segmented body; three germ layers; welldeveloped coelom.


2.- Notochord (a skeletal rod) present at some stage in the life cycle.


3.-Single, dorsal, tubular nerve cord; anterior end of cord usually enlarged to form brain.


4.- Pharyngeal pouches present at some stage in the life cycle; in aquatic chordates these develop into pharyngeal slits.


 5.- Endostyle in floor of pharynx or a thyroid gland derived from the endostyle.


6.- Postanal tail projecting beyond the anus at some stage but may or may not persist.


7.-Complete digestive system.


8.- Segmentation, if present, restricted to outer body wall, head, and tail and not extending into coelom




Integrated principles of zoology / Cleveland P. Hickman, Jr. ... [et al.]. – 14th ed. p. cm.

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