Feb 25 Arthropods 2009

Feb 25 Arthropods 2009 - PHYLUM ARTHROPODA Arthropods...

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PHYLUM ARTHROPODA Arthropods - Insects, Crabs, Spiders Centipedes etc. KEY FEATURES Bilateral Protostome Ecdysozoans Chitinous jointed exoskeleton grow by molting jointed appendages with muscles interior to the exoskeleton Basic segmentation - similar to Annelids & seen in some primitive forms Tagmatization- fusion of some body segments Basic body divisions Head with: mouth with feeding appendages simple and/or compound eyes sensory appendages Thorax with: Walking legs Wings if present Abdomen with: Swimming appendages if aquatic Digestive system Heart Reproductive system Note Thorax and head may be fused into a Cephalothorax The abdomen may have walking legs swimming appendages gills or no appendages Metamorphosis - change in basic body form with development More than one million named species - the "typical" animal is an arthropod
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“TERRESTRIAL ARTHROPODS" In this section we will be dealing mostly with the largest group of animals the insects. However note that Arachnids in Subphylum Cheliceriformes and the Myriapoda which are uniramous like Insects are also mostly terrestrial. Also a few Crustaceans are terrestrial. UNIRAMA Subphylum Hexapoda (= insects) about 32 orders close to 1,000,000 species Three body regions: Head, Thorax and Abdomen Head with one pair of antennae two compound eyes & usually two or three ocelli
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