PHYLUM CHORDATA
PHYLUM CHORDATA
PHYLUM CHORDATA
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…and myxiniforms<br />
(lampreys and hagfishes).<br />
Primitive vertebrates like<br />
this lamprey have (had) 7<br />
gill arches and pouches.<br />
They were jawless, and<br />
instead possessed a<br />
circular or slitlike mouth.<br />
Placoderms are the<br />
first group to show<br />
the evolution of<br />
jaws…<br />
http://cas.bellarmine.edu/tietjen/images/placoderm_330_mybp.jpg<br />
www.zoology.ubc.ca/courses/bio204/lab6_photos.htm<br />
…derived from<br />
the first gill<br />
arch.<br />
http://palaeo.gly.bris.ac.uk/palaeofiles/lagerstatten/Gogo/fauna.html<br />
6
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