arthropoda_2010.pdf - Arthropoda is the largest phylum in...

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Arthropoda is the largest phylum in the animal kingdom (>80% species) Arthropoda ( arthros = joint, podus = foot) Jointed appendages 1. Chitinous exoskeleton 2. Segmented body, tagmatization 3. Special respiratory structures e.g., gills, tracheae, book lungs 4. Open circulatory system 5. Well-developed sensory structures 6. Special excretory sytems e.g., malpighian tubules and coxal glands for terrestrial arthropods 7. Dioecious 8. Tagmatization - fusion of segments into specialized functional regions. Each region is called a tagma (pl. tagmata) Pasted from < 0/arthropods_08 > Pasted from < > Arthropod subphyla Chelicerata Lack antenna Tagmata: prosoma & opisthosoma Chelicerae, pedipalps, 4 prs walking legs Myriapoda 1 pr antennae Tagmata: head & trunk Many segments Crustacea 2 prs antennae, Biramous appendages Mainly aquatic w/ nauplius larva Tagmata: head, thorax (or cephalothorax) & abdomen Hexapoda 1 pr antennae, uniramous appendages, 6 legs Mainly terrestrial Tagmata: head, thorax & abdomen "Uniramia" used to be a subphylum consisting of myriapods and hexapods. This grouping turns out to be polyphyletic.
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