3454chapter24 - Fishes, Ch. 24 I. Phylum Chordata,...

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Fishes, Ch. 24 I. Phylum Chordata, subphylum Vertebrata A. “Fish” not monophyletic (paraphyletic) as tetrapods are descended from lobe-finned fish B. Aquatic with gills, limbs in the form of fins (if present) and dermal scales (usually) C. Superclass Agnatha—“without jaws”, no mandible, no paired- fins, no scales 1. Multiple, simple pore-like gill openings 2. Notochord retained through adulthood
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3. Class Myxini—hagfish, most primitive group, all marine, scavengers or predators a) Reproductive biology poorly known
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b) as a defense mechanism, release copius amounts of slime some crazy grad students have even tasted the slime. .. (UBC)
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4. Class Petromyzontes—lampreys, marine or freshwater as adults, free-living or ectoparasitic a) Alternate Class name--Cephalaspidomorphi b) Ammocoetes larva very similar to Amphioxus c) Adults ascend streams to mate, then die
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d) mouth with rasping tongue and teeth from grasping. .. B. Superclass Gnathostomata—“jaw mouth”, mandible derived from 1 st 2 gill arches, paired fins (or limbs) 1. Includes all remaining fishes and all tetrapods 2. Class Chondrichthyes—“cartilaginous fish”, almost all marine, sharks, skates, rays, rat fish (chimera)
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e) No swim bladder, no lung, large oily liver f) Lateral line system for vibration detection
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This note was uploaded on 11/29/2009 for the course BIOL 3454 taught by Professor Lab during the Spring '08 term at UT Arlington.

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3454chapter24 - Fishes, Ch. 24 I. Phylum Chordata,...

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