BIO 360 Study Guide - Quiz Guide: Meiosis, Marine Ecosystem, Oviparity
29 May 2017
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Document Summary
Marine shes show an amazing variety of adaptations to exploit nearly every ecological niche in the ocean intertidal to deepest ocean. Number of species of shes outnumbers all other chordates combined (30,000 species of shes) From a more practical standpoint marine sh are important. All shes have: segmental ossi cation of the notochord (vertebrae) All but hag sh have vertebrae surrounding the spinal cord: musculature that is segmented into myomeres, closed circulatory system with hemoglobin contained within red blood cells that cannot leave the blood vessels. Earliest vertebrates were shes that lacked both paired ns and jaws. Most present day shes have jaws and ns but some still lack those features. Fish can be grouped into 6 types (5 marine) B. elasmobranchs (sharks and skates & rays) a. ) Gills covered with operculum (like bony sh) Flat plates in jaws to crush prey rather than teeth mollusks, crustaceans, echinoderms, sh. All oceans greatest number of species in subtropical/tropical waters.
