Phylum Arthropoda

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Phylum Arthropoda General Characteristics of phylum shared by members of all subphyla: -chitinous, hardened exoskeleton that must be shed to grow -obvious segmentation (metamerism) -paired, jointed appendages on many segments Subphylum: Trilobita body plan: head, thorax, pygidium compound eyes antennae mandibles for feeding? branched (biramous) lappendages respiration by gills? able to roll up like pill bugs once most common arthropod, now completely extinct Subphylum: Myriopoda (centipedes, millipedes) body plan: head, long trunk lack compound eyes single pair of antennae mandibles for feeding Major Groups : unbranched legs on most segments Chilopoda (centipedes) respiration by tracheae Diplopoda (millipedes) Subphylum Chelicerata: (spiders, horshoe crab, scorpions, mites, ticks) body plan: cephalothorax, abdomen most lack compound eyes no antennae Major Classes : chelicerae for feeding (no mandibles) Merostomata (horshoe crabs) four pairs of unbranched legs Arachnida (spiders, scorpions, mites & ticks) respiration by gills, book lungs, book gills or tracheae Pycnogonida (sea spiders) Subphylum Crustacea: (crabs, shrimp, crayfish, barnacles, pill bugs, water fleas) body plan: cephalothorax, abdomen, tail compound eyes two pairs of antennae Major Classes : mandibles for feeding Malacostraca (shrimp, crab, pill bugs, amphipods) branched (biramous) appendages Branchiopoda (water fleas, brine shrimp, fairy shrimp) respiration by gills Maxillipoda (copepods, seed shrimp, barnacles) only subphylum that is mostly aquatic Subphylum: Hexapoda (beetles, flies, bugs, crickets, mayflies, dragonflies, moths, wasps, etc.) body plan: head, thorax, abdomen compound eyes single pair of antennae mandibles for feeding three pairs of unbranched legs Major Groups : two pairs of wings Apterygota (wingless insects; springtails, silverfish) respiration by tracheae Pterygota (flying insects; dragonflies, butterflies, etc) includes only invertebrates that can fly.

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