2. Arthropod Diversity 2010

2. Arthropod Diversity 2010 - into the tagmata- the pattern...

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1 Arthropod Diversity • Where do insects fit in the Tree of Life? • Quick look at insect relatives – similarities and differences What are Arthropods? • Jointed appendages – new type of locomotion • Rigid exoskeleton – plates or sclerites separated by membrane Summary – Arthropods Innovations • Rigid exoskeleton – plates or sclerites separated by membrane • Jointed appendages – lots of them Where do the Arthropods fit? 1. Articulata -- with worms, traditional view 2. Ecdysozoa -- with nematodes, controversial view; based on regularly shedding their cuticle 2. 1.
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2 Phylogeny based on 18S rDNA sequences and Hox gene cluster composition Onychophora–ve lvet ±worms Tardigrada – water bears Scenario Hypothetical Arthropod - body plan with lots of redundancy - both in segments and limbs Î Evolutionary potential Arthropods are ancient
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3 Burgess Shale – Field, B.C. Tagmosis - the grouping of segments into functional units Î tagma - incorporation of limbs (appendages)
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Unformatted text preview: into the tagmata- the pattern of tagmosis define major groups of arthropods Mouthparts Legs Chelicerae Mandibles Biramous Uniramous 4 TRACHEATA Trilobita Compound eye Head Thorax Pygidium Antennae TRACHEATA Crustacea 5 Sowbugs (Isopoda) are terrestrial crustaceans Chelicerata Tagmata: cephalothorax, abdomen-no antennae-chelicerae, pedipalps Chelicerata Chelicerae Arachnida Major Groups of Arachnida Scorpiones 6 Pseudoscorpiones Solpugida wind scorpions Uropygida whip scorpions Araneae spiders 7 The importance of silk http://www.youtube.com/watch?v=s HzdsFiBbFc Required Reading: Angier, 1996. For an Australian spider, love really is to die for. New York Times-Maydiannes piece Acari mites and ticks TRACHEATA Tagmata Hexapoda Arachnida Myriapoda 8 TRACHEATA Myriapoda Chilopoda - centipedes Diplopoda - millipedes TRACHEATA...
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This note was uploaded on 03/25/2010 for the course EEB eeb356 taught by Professor C.darling during the Spring '10 term at University of Toronto- Toronto.

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2. Arthropod Diversity 2010 - into the tagmata- the pattern...

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