EEB263H1 Study Guide - Midterm Guide: Filter Feeder, Agnatha, Chondrichthyes
16 Nov 2017
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Know the 5 main chordate characteristics and be able to provide a brief description of each of these: pharyngeal slits, notochord, dorsal hollow nerve cord, endostyle, post-anal tail. Also, you should know the distribution of these features in urochordata, Feeding in urochordates(filtration), cephalochordates prevertebrate* (suspension feeding, cilia-mucus) and craniates. (cid:498)ostracoderms(cid:499) are the extinct agnathans, (cid:498)cyclostomes(cid:499) are living agnathans (lamprey and hagfish ). Higher fishes (usually have osteichthyes): include acanthodi (with many bony plates, odd fins with spines, extinct) and osteichthyes (the usual bony fishes). 99% of all living fishes; marine & freshwater habitats(cid:464) and. For actinpoterygians(cid:463)fins supported by rays; poor muscular development; primitively 1 dorsal fin & ganoid scales ; nasal sacs isolated: no internal nostrils(cid:464): chondrostean (primitive), holostean (not a natural group; intermediate; freshwater fast-swimming), teleosteans (advanced; most living fishes). For these ray-finned fishes, know the three main trends in body shape and fin/form function, jaw modifications, and tail structure (so know the different types of tail):
