Invertebrates 3 - Insect morphology/anatomy Metamorphosis Flight • Evolved only once • May have evolved to help aquatic insects move on water

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10/24/10 Arthropods Triploblastic Coelomates Bilateral symmetry Protostome Segmented bodies Exoskeleton/cuticle of chitin Protection
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Click to edit Master subtitle style 10/24/10 Where to start?
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10/24/10 Arthropod subphyla Cheliceriformes Characteristics 6 pairs of appendages Includes claw-like feeding appendage (chelicerae) Anterior cephalothorax and a posterior abdomen Lack antennae and have simple eyes Xiphosura (horseshoe crabs) Arachnids (scorpions, spiders, ticks, and
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10/24/10 Earliest forms Eurypteri ds
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10/24/10
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10/24/10 Arthropod subphyla Myriapoda Distinct head bearing antennae Chewing mouthparts (mandibles) Two classes Chilopoda One pair of legs per segment Predators with poison claw on foremost segment Diploda
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10/24/10 Arthropod subphyla Hexapoda: insects plus collembola (flightless) Insects Body divided into head, thorax, and abdomen Antennae present Mouthparts modified for chewing , sucking, and lapping Most but not all have wings
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Unformatted text preview: 10/24/10 Insect morphology/anatomy 10/24/10 Metamorphosis 10/24/10 Flight • Evolved only once • May have evolved to help aquatic insects move on water surface • Unlike vertebrates where wings are modified limbs, they’re outgrowths of the cuticle in insects – Don’t have to give up limbs to fly 10/24/10 Arthropod subphyla • Crustacea – Body of two or three parts – Antennae present – Chewing mouthparts – 3 or more pairs of legs • Often specialized • Unlike insects also found on abdomen – Mostly marine and freshwater 10/24/10 Familiar members 10/24/10 Echinoderms • Deuterostome development (of a kind likely homologous to our own) • Thin epidermis covers an endoskeleton • Have a water vascular system 10/24/10 Morphology/Anatomy 10/24/10 Many have a pentamerous symmetry And they appear to be radially symmetric 10/24/10 But larvae aren’t 10/24/10 And even adults really aren’t...
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This note was uploaded on 10/23/2010 for the course BIOL 2308 taught by Professor Boxer during the Spring '10 term at University of Houston - Downtown.

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Invertebrates 3 - Insect morphology/anatomy Metamorphosis Flight • Evolved only once • May have evolved to help aquatic insects move on water

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