BIOL 2P92 Study Guide - Final Guide: Agnatha, Gnathostomata, Hyperoartia
12 Apr 2016
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Final exam review - chapter 16 fishes. Swim bladder: buoyancy; by removing or adding air. Olfactory and visual sensiivity to water: lateral-line system. Earliest ish ; paraphyleic assemblage of (jawless ish) agnathan ishes. Along living ostracoderms: lamprey (dissecion) class petromozyonida/ class hyperoaria, order. Petromyzoniformes: hagish class myxini, order myxiniformes. 2 disinct clades of osteichthyes (bony ish and tetrapods: clade acinoptergii. Lack: jaws, internal ossiicaion, scales, paired ins. In lampreys: cerebellum, eye lens, vertebrae, myelin on nerves. Not parasiic like lampreys: scavengers & predators. Most blind: quickly atracted to food (mainly dead/dying ish) Uses 2 toothed, kerainzed plates on tongue. Fold together in pincer acion to eat prey. Body luids of hagish are in osmoic equilibrium w. sea water. Low pressure circulatory system: 3 accessory hearts + main heart behind gills. Freshwater streams (spawn in winter/spring in shallow areas) Mouth surrounded by kerainized teeth; no barbells. No jaws: mouth w. kerainized plates (hagish, teeth (lampreys)
