Bio 201 F08 True lect 14v3r

Bio 201 F08 True - Appendages Biramous =branched(forked Though to be the ancestral condition Many appendages Have lost this branching In evolution

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Unformatted text preview: Appendages Biramous =branched (forked) Though to be the ancestral condition. Many appendages Have lost this branching In evolution e.g. crabs, krill, pill bugs, and shrimp http://www.dgsgardening.btinternet.co.uk/pillbug.JPG genus Armadillidium Barnacles are crustaceans modifed For sessile liFe style http://www.njscuba.net/biology/img/anatomy_barnacle.gif “… a little shrimp-like animal, standing on its head in a limestone house and kicking food into its moth.”-Louis Agassiz Found in huge diversity of aquatic and marine habitats. There may be ~ 1 copepod / liter in the ocean. Ocean volume: 1.37 x 10 14 liters Copepods: Possibly most abundant animal on earth Most ≤ few mm In length herbivores parasites, or symbionts Chelicerata Chelicerata horseshoe crabs, spiders, scorpions, mites & others Prosoma- anterior 6 fused segments (no appendages) 6 pairs of appendages Opisthosoma - posterior with or without appendages Chelicerae - fang like mouth parts of spiders Chelicera (singular) Pedipalp Latin [“foot”+“touch”] Spider: Prosoma, Opisthosoma Insect: Head, Thorax, Abdomen Evolution of the insect wing • pdm is also called nubbin in Drosophila (fruit Fies) • this gene encodes a protein that regulates transcription of other genes springtails apterygotes (bristletails, silverfish) mayflies,dragonflies (wings cannot be folded back) exopterygotes (wings develop outside body) Hemimetabolous incomplete metamorphosis endopterygotes (wings develop inside body) Holometabolous complete metamorphosis >80% of all insect species e.g. grasshoppers, roaches, locusts, mantids, stick insects, termites, earwigs, aphids, cicadas e.g. beetles, butterflies, moths, bees, wasps, ants, flies HEXAPODS, NOT INSECTS INSECTS PTERYGOTES [WINGED INSECTS] A current view of insect relationships Insect development some have direct development some indirect many different varieties Holometabolus - complete metamorphosis modifcations oF mouthparts large diversity oF Feeding modes Insects: success on land • Insect exoskeleton, tracheal system, Malpighian tubules (concentrate wastes to preserve water) are all key adaptations for a...
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This note was uploaded on 04/14/2009 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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Bio 201 F08 True - Appendages Biramous =branched(forked Though to be the ancestral condition Many appendages Have lost this branching In evolution

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