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BIOL 142 Chapter 34 Study Guide for TEST 3-2

BIOL 142 Chapter 34 Study Guide for TEST 3-2 - divided by...

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BIOL 142: Study Guide for TEST # 4 Chapter 34 – Coelomate Invertebrates (Bilaterally symmetrical animals with a ‘true’ body cavity) = annelids, mollusks, arthropods, and echindoderms Phylum Mollusca = slugs, snails, clams, oysters, octopus, squid, etc. - digestive, excretory, and reproductive organs are concentrated into a visceral mass; muscular foot for locomotion, mantle secretes calcium carbonate shell (found in most); many have a tongue-like radula ; most have open circulatory system; many have free-swimming larvae and are sessile as adults Class Polyplacophora = chitons Class Gastropoda = snails and slugs Class Bivalvia = clams, scallops, muscles, oysters, etc. – 2 shells hinged dorsally; mostly filter feeders, some burrowers have siphons; no distinct head region Class Cephalopoda = octopuses, squids, and nautiluses; active predators; foot has evolved into arms/ tentacles ; most lack external shell; highest level of intelligence found in any invertebrates Phylum Annelida: segments
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Unformatted text preview: divided by septa (some organs are repeated in each segment); head region with sensory organs; fluid in the coelom makes a hydrostatic skeleton; closed circulatory system; ventral nerve cord; gas exchange through skin – group includes earthworms and leeches Phylum Arthropoda – Ecdysozoans with exoskeletons and jointed appendages ; segments fused into tagmata ; open circulatory system; ventral nerve cord; respiratory system with tracheae/ spiracles Class Arachnida = spiders, scorpions, ticks, and mites; body = two major tagmata Class Chilopoda ( centipedes ) and Class Diplopoda ( Millipedes ) Class Crustacea = crabs, shrimp, lobsters, crawfish, barnacles, isopods, etc. – typically have 3 tagmata, and biramous appendages Class Hexapoda = Insects – 3 body regions ( head, thorax, abdomen ) Phylum Echinodermata = deuterostomes = starfish, sea urchins, sand dollars, etc. –unique water vascular system , including tube feet used for locomotion, etc....
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