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Classification of the Phylum Arthropoda
Transcript of Classification of the Phylum Arthropoda
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
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:)