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3454lablecture7 - LECTURE 7 PHYLUM ARTHROPODA AND PHYLUM...

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LECTURE 7 PHYLUM ARTHROPODA AND PHYLUM ONYCHOPHORA PHYLUM ONYCHOPHORA Have characters of both Annelida and Uniramia Have segments with no septa, unjointed limbs, antennae, mandibles, chitin, exoskeleton Use metanephridia for excretion, one in each segment Use tracheal system with spiracles for respiration Have hydrostatic skeleton, move like worms Lay eggs (no larval stage) Adapted from marine forms similar to polychaetes, now restricted to moist tropical and mountainous rain forests PHYLUM ARTHROPODA SUBPHYLUM UNIRAMIA General characteristics of arthropods plus: unbranched limbs (uniramous), distinct head, 1 pair of antennae, 1 pair of mandibles, 1 or 2 pairs of maxillae (2 nd pair fused to form labium), breathe with spiracles leading to tracheal system (some have “air pumps” in wing musculature), use malphigian tubules to excrete uric acid (conserves water) Important and numerous group: pollination, pest control, disease vectors, crop destruction CLASS CHILOPODA (CENTIPEDES)
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