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The Armored Achievers pp. 125-131
Arthropods The Armored Achievers pp
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Arthropod Largest phylum with 1 million species (3/4 of all animals on earth) Segmented bilateral symmetry Exoskeleton that must be molted in order to grow Jointed appendages Blood-vascular system Mostly internal sexual reproduction
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subphylums
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Uniramia - Class Insecta
3 pairs of legs largest & most diverse group on earth rarely in the sea but live at the water’s edge Ex. Water strider
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Subphylum Chelicerata
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Class Merostomata “Living fossils” NW Atlantic, Gulf, Japan, Korea
shallow, soft bottoms Ex. Horseshoe crab (Limulus polyphemus)
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mouth carapace abdomen Book gills Inhalent current Repiratory chamber Exhalent current
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Class Pycnogonida 1mm - 40cm pole to pole
narrow body, proboscis, 4 very long legs males carry the eggs Ex. Sea Spiders
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Subphylum Crustacea 35,000 species
Primarily marine, some freshwater, semi terrestrial, terrestrial Use maxillae for filter – suspension feeding Gills – adapted to live in water 2 pair of antennae for sensory
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Classes of Crustacea
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Crustacean classes
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Subclass Cirripedia Free-swimming larva
Cement glands attach adult form to substrate (sessile) Hermaphroditic (long coiled penis) Ex. Barnacles
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cirri cement gland
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Subclass Copepoda Most abundant plankton, largest protein source (1st level consumer) Most are free-swimming but some are parasitic First antennae long for drag Planktonic larva of many crustacean Ex. copepods
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Class Malacostraca 14 segments + a telson
contains over half of all known crustaceans
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Orders of Malacostraca
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Order Isopoda Bottom dwellers (deep to intertidal)
Herbivorous scavengers Ex. Pillbugs on land, gribbles in ocean
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Order Amphipod burrowing in sandy and muddy sediments
usually flattened from side to side three pairs of short tail limbs are used to flick them out of danger
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decapods ‘10 legs’ largest
5 pair of walking legs - 1st pair heavier with pinchers (cheliped) Ex. Crayfish, lobster, crab, shrimp
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Callinectes sapidus
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