BIS2C_Lect32_Ward_Arthropoda_2_ppt

BIS2C_Lect32_Ward_Arthropoda_2_ppt - Emerging consensus on...

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1 BIS2C Winter 2012 (Ward) Lecture 32. Arthropoda, Part 2 Today’s 2 nd lecture (12 March) excerpt from “Life in the Undergrowth” Hexapoda wing evolution metamorphosis coevolution with angiosperms social insects Wednesday’s lecture (14 March) Echinodermata Chelicerates (arachnids, horseshoe crabs, sea spiders ) A HC SS Myriapods (centipedes, millipedes) Hexapods (insects and relatives) Crustaceans (crabs, shrimp, etc.) Emerging consensus on phylogeny of Arthropoda Trilobita (extinct) Sea spider (Pycnogonida) A = arachnids HC = horseshoe crabs SS = sea spiders Chelicerates (arachnids, horseshoe crabs, sea spiders) Myriapods (centipedes, millipedes) Crustaceans (crabs, shrimp, etc.) Hexapods (insects and relatives) Emerging consensus on phylogeny of Arthropoda Trilobita (extinct) Hexapods are the most diverse subgroup of arthropods Chelicerates (arachnids, horseshoe crabs, sea spiders) Myriapods (centipedes, millipedes) Hexapods (insects and relatives) Crustaceans (crabs, shrimp, etc.) Numbers of described living species in each arthropod group 98,000 14,000 52,000 1,000,000 Trilobita (extinct) Hexapods are the most diverse subgroup of arthropods Numbers of described species among the major animal groups (from Wilson, 1992). Arthropoda Numbers of described species among the major animal groups (from Wilson, 1992). Hexapoda
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2 Numbers of described species among the major animal groups (from Wilson, 1992). just three insect orders contribute half of all described animal species! Numbers of described species among the major animal groups (from Wilson, 1992). “an inordinate fondness for beetles” (J. B. S. Haldane) Hexapods: numerous beneficial and harmful species Hexapoda – insects and allies three tagmata : head, thorax and abdomen Hexapoda – insects and allies three tagmata: head, thorax and abdomen one pair of antennae (two pairs in other crustaceans) Hexapoda – insects and allies three tagmata: head, thorax and abdomen one pair of antennae (two pairs in other crustaceans) three pairs of legs (located on the thorax)
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3 Hexapoda – insects and allies
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BIS2C_Lect32_Ward_Arthropoda_2_ppt - Emerging consensus on...

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