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Arthropoda

Zoology
by

Kailey Neff

on 15 April 2010

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Transcript of Arthropoda

Phylum Arthropoda Subphylum Trilobitomorpha Subphylum Chelicerata Subphylum Crustacea Subphylum Hexapoda
Subphylum Myriapoda Animals that show metamerism with tagmatization, a jointed exoskeleton, and a ventral nervous system Marine, all extinct; lived from Cambrian to Carboniferous periods;bodies divided into three longitudinal lobes; head, thorax, and abdomen present; one pair of antennae and biramous appendages Body usually divided into prosoma and opisthosoma; first pair of appendages piercing or pincerlike and used for feeding Most aquatic, head with two pairs of antennae, one pair of mandibles, and two pairs of maxillae; biramous appendages Body divided into head, thorax, and abdomen; five pairs of head appendages; three pairs of uniramous appendages on the thorax. Insects and their relatives. Body divided into head and trunk; four pairs of head appendages; uniramous appendages. Millipedes and centipedes. Class Merostomata Class Arachnida Class Pycnogonida Marine, with book gills on opisthosoma. Two subclasses: Eurypterida, a group of extinct arthropods called giant water scorpions, and Xiphosura, the horseshoe crabs. Mostly terrestrial, with book lungs, tracheae, or both; usually four pairs of walking legs in adults. Spiders, scorpions, ticks, mites, harvestmen, and others. Reduced abdomen; no special respiratory or excretory structures; four to six pairs of walking legs; common in all oceans. Sea spiders. Class Remipedia Cave-dwelling crustaceans from the Caribbean basin, Indian Ocean, Canary Islands, and Australia; body with approximately 30 segments that bear uniform, biramous appendages. Class Cephalocarida Small marine crustaceans with uniform, leaflike, triramous appendages. Class Branchiopoda Flattened, leaflike appendages used in respiration, filter feeding, and locomotion, found mostly in freshwater. Fairy shrimp, brine shrimp, clam shrimp, water fleas. Class Malacostraca Appendages possibly modified for crawling, feeding, swimming. Lobsters, crayfish, crabs, shrimp, isopods. Class Maxillopoda Five head, six thoracic, and four abdominal somites plus a telson; thoracic segments variously fused with the head; abdominal segments lack typical appendages; abdomen often reduced. Barnacles and copopods.
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