WCHS Zoology Chapter 14 Classification of Arthropoda
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| Arthropoda | amimals that show metamerism with tagmatization, a jointed exoskeleton, and a ventral nervous system
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| Subphylum Trilobitomorpha | marine, all extinct; lived from Cambrian to Carboniferous periods; bodies divided into three longitudinal lobes; head, thorax, and abdomen preent; one pair of antennae and biramous appendages
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| Subphylum Chelicerata | body usually divided into prosoma and opisthosoma; first pair of appendages piercing or pincherlike (chelicerae) and used for feeding
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| Class Merostomata | marine, with book gills on opisthosoma, two subclasses: eurypterrida, a group of extinct arthropods call giant water scorpions; and Xiphosura, the horseshoe crab. Limulus
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| Class Arachnida | mostly terrestrial, with book lungs, tracheae, or both; usually four pairs of walking legs in adults, spiders, scorpions, ticks, mites, harvestmen, and others
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| Class Pycnogonida | reduced abdomen; no spedial respiratory or excretory structures; four to six pairs of walking legs; common in all oceans, sea spiders
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| Subphylum Crustacea | most aquatic, head with two pairs of antennae, one pair of mandibles, and two pairs of maxillae; biramous appendages
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| 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
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| Class Branchiopoda | flattened, leafelike appendages used in respiration, filter feeding, and locomotion, found mostly in freshwater; fairy shrimp, brine shrimp, clam shrimp, water fleas.
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| Class Cephalocarida | small (3 mm) marine crustaceans with uniform, leaflike, triramous appendages
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| Class Malacostraca | appendages possibly modified for crawling, feeding, swimming; Lobsters, crayfish, crabs, shrimp, isopods (terrestrial)
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| Class Maxillopoda | five head, six thoracic, and four abdominal somites plus a telson; thoracic segments variously fused with the head; abdominal segments lack typical appedages; abdomen often reduced; barnacles and copepods
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| Subphylum Hexopoda | body divided into head thorac, and abdomen; five pairs of head appendages; three pairs of uniramous appendages on the thorax; insects and their relatives
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| Subphylum Myriapoda | body divided into head and trunk; four pairs of head appendages; uniramous appendages; millipedes and centipedes
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