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Anthropods

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by

zoe carrillo

on 16 April 2010

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Transcript of Anthropods

Phylum arthropoda metamerism, tagmatization, jointed exoskeleton, ventral nervous system. Trilobitomorpha Chelicerata merostomata arachnida pycnogonida Crustacea Hexapoda Myriapoda remipedia cephalocarida branchiopoda malacostraca maxillopoda extinct & marine Pincer like fronts to aid in feeding marine and book gills Eurypterida extinct "giant water scorpions" Xiphosura horse shoe crab book lungs 4 prs. of walking legs scorpions ticks etc. sea spider reduced abdomen 4 to 6 pairsof legs common in all oceans cave dwelling 30 segmented body biramous appendages Most aquatic, head with two pairs of antenna, one pair of mandibles and two pairs of maxille Small uniform leaf like appendages filter feeding fresh water Ex.: Water fleas & shrimp Appendages made for crawling, feeding, and swimming. Lobsters Crayfish Crabs Shrimp etc. Five Heads Tellson Six Thoracic 4 abdominal Barnacles Copepods head, thorax, and abdomen 5 pairs of head appendages insects and relatives Head and trunk millipedes centipedes
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