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1.18.08 - 1.18.08 Lecture 5 Arthropod...

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1.18.08 Lecture 5 Arthropod characteristics (arthropod = insects and their relatives including   spiders, ticks/mites, crustaceans, scorpions, etc): Exoskelton: contains  chitin ; functions = protection, muscle  attachment, prevent disiccation; discuss process of molting Segmentation (mertamerism; tagmosis) o Tagmosis – organization of body into major units such as head,  thorax, and abdomen Jointed legs (and some other appendages) o Appendages include legs, antennae, mouthparts, wings, gills, etc. Bilateral symmetry Other characteristics o Open circulatory system Heart, but no arteries or veins Hemolymph = insect blood clear, yellow, or green, but rarely red; no hemoglobin Hemocoel = body cavity in which hemolymph flows o Double ventral nerve cord o Sexual reproduction o Respiration by means of gills, or tracheae and spiracles o http://evolution.berkeley.edu/evolibrary/article//arthropods_04     Arthropod look-alikes o Annelida E.g. earthworm, leeches o Onychophora Velvet worms
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Arthropod Classification Phylum =  Arthropoda ; two subphyla o
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