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BIO120H1 (144)
Midterm

Midterm note for EEB267
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Department
Biology
Course
BIO120H1
Professor
thompson/barrett
Semester
Fall

Description
Chordata Pharyngeal slitsnot unique to Chordata Supported by a pair of cartilaginous rods stiffen openingstays open longerFunction feeding or respiratory depending on groupSynapomorphy 1 dorsal hollow nerve cordFunction forms the central nervous system spinal nerve cordbrain Synapomorphy 2 notochord Cartilaginous rod with uid lled cells making it internally exible collagenelastinWith notochord body bends like sh swimming without it compresses In basal chordates support and induction of muscle formation around it In vertebrates notochord forms during developmentthen is incorporated into the vertebral column intervertebral discs Synapomorphy 3 the post anal tail Function movement propulsioncephalochordatalancelets amphioxusHead cordNotochord runs thought the anterior tip of the head Live in burrows in shallow warm coastal marine watersSingle photo receptive frontal eyeAncestor of vertebrates Filter feederscirri near the mouth captures food particles and atripore
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