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Classification of the Phylum Arthropoda

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Jennifer Riggle

on 16 April 2010

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Transcript of Classification of the Phylum Arthropoda

Phylum arthropoda subphylum trilobitomorpha subphylum chelicerata subphylum crustacea subphylum hexapoda subphylum myriapoda class merostomata class arachnida class pycnogonida class remipedia class cephalocarida class branchiopoda class malacostraca class maxillopoda body divided into head, thorax, & abdomen; five pairs of head appendages; three pairs of uniramous appendages on the thorax. Insects and their relatives. 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 divided into head & trunk; four pairs
of head appendages; uniramous
appendages. Millipedes and centipedes. most aquatic, head with two pairs of antennae, one pair of mandibles, and two pairs of maxillae; biramous appendages. body usually divided into prosoma and opisthosoma.
first pair of appendages piercing or pincerlike (chelicerae)
and used for feeding. 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.
ex. spiders, scorpions, ticks, mites,
harvestmen, and others reduced abdomen; no special respiatory
or excretory structures; four to six pairs
of walking legs; common in all oceans.
Sea spiders small (3 mm) marine
crustaceans with
uniform. leaflike,
triramous appendages flattened, leaflike appendages used in respiration, filter feeding, and locomotion, found mostly in freshwater. Fairy shrimp, brine shrimp, clam shrimp, water fleas cave-dwelling crustaceans from the Caribbean basin, Indian Ocean, Canary Islands, and Australia; body with approx. 30 segments that bear uniform, biramous appendages appendages possibly modified for crawling, feeding, swimming.
Lobsters, crayfish, Crabs, Shrimp, Isopods (terrestrial) 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 copepods. da end:)
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