Bio 2 Lab- Animal Diversity (arthropods I)

Bio 2 Lab- Animal Diversity (arthropods I) - Term...

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Term: Arthropoda Definition: "jointed-foot" animals 80% of all known species Term: characteristics Definition: coelomate triploblastic protostomate bilateral symmetry Term: Phylum Onchophora Definition: closest living non-arthropod form "velvet worms" numerous paired, UNJOINTED legs soft outer cuticle is molted (ecdysis) have a hemocoel (true coelom is reduced) trachael system dioecious
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Term: Phylum Tardigrada Definition: "water bears" may have an affinity to arthropods live in mosses & lichens teeny: eutely 4 pairs of UNjointed legs ending in claws no respiratory organs capable of cryptobiosis Term: cyrptobiosis Definition: when dessicated, animal shrivels into a "tun" until water returns "hidden life" Term: tagmosis Definition: segments fussed together for specialized functions Term: shared characteristics w/ polychaetes (annelids) Definition: metameric segmentation budding zone during develop. paired appendages on segments double ventral nerve cord w/ ganglia a cuticle secreted by hypodermis tissue
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Term: arthropodizarion Definition: hard outer exoskeleton jointed appendages move by antagonistic muscle pairs major body cavity is a HEMOCOEL (persistent blatocoel)...(the true coelom is reduced) tagmosis OPEN circulatory system Term: open circulatory sys Definition: blood empties from vessels into sinuses to bathe organs and tissues and returns directly from the hemocoel to the pumping heart through ostia Term: symmetry Definition: bilateral Term: exoskeleton Definition: hard, chitinous cuticle that periodically molts
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