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19. Artrhopoda III Nov 5

19. Artrhopoda III Nov 5 - Phylum Arthropoda Phylum...

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1 Phylum Phylum Arthropoda Arthropoda Triploblastic Triploblastic Coelomate Coelomate Protostomes greatest # species described huge diversity of life styles, body structures, and morphologies Review: Phylum Arthropoda Trilobitomorpha Cheliceraformes Chelicerata Xiphosura Arachnida Pycnogonida Crustacea ~10 Major Taxa Hexapoda Insecta Myriapoda Crustacea Crustacea ~ 10 Classes/ major groups ~ 10 Classes/ major groups Most marine Some freshwater Few make transition to living on land – many still tied to water for larval stages Crustacea crabs, lobsters, shrimp, barnacles, copepods Tagmata Head, thorax, abdomen Head - 5 pr. Appendages - First Antennae Second Antennae Mandibles First Maxillae Second Maxillae Thorax - 8 pr. Appendages specializations - food sorting - maxillipeds locomotion - pereopods Carapace - fused cover of head and thorax Cephalothorax - single tagma Abdominal Appendages Pleopods (pleon = abdomen) Some have distinct Uropods last few segments Terminal Telson with anus Can have appendages - caudal rami
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2 Crustacean Biramous Appendage 2 branches Endopodite - near midline Exopodite - lateral branch some modified in derived groups Molting: Must molt to grow When molting - body size inflated to create bigger exoskeleton - uptake of water or air After hardened, can grow to fill with tissue In Crustacea Some calcium and resorbed from old cuticle (marine usually take up more from sea water), stored in blood In Crustacea Molting hormonally controlled Y-Organs - in the head - Promotes molting X-Organ - in eye stalk - Inhibits molting Balance of hormones produced by each determines molt cycle Affected by age, energy stores Reproduction Copulate Most do not have motile sperm , some do Sperm packed in Spermatophores
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  • Fall '10
  • Padilla
  • Arthropoda Trilobitomorpha Cheliceraformes Chelicerata Xiphosura Arachnida Pycnogonida Crustacea, Arachnida Pycnogonida Crustacea, Hexapoda Insecta Myriapoda, Phylum Arthropoda Trilobitomorpha, major groups Crustacea

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