Arthropod_Body_Plan_Chart_Filled_in - mandibles Horseshoe...

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SCI 240- Extra Session #2 The Arthropod Body Plan Characteristics: 1- Exoskeleton of chitin – reinforced with calcium carbonate or sclerotin 2- Segemented body plan Tagmosis – fusion of segments that are specialized by size and appendages attached 3- Open circulatory system with a hemocoel – blood in the coelom 4- Jointed appendages that are modified for different uses 5- Dorsal brain and ventral nerve cord Sub-phylum Class/example Head Appendages Tagmosis Appendages Other Features Trilobita Trilobite Antenna Compound eyes Head Thorax Biramous **extinct** Chelicerata Horseshoe crab Spiders Scorpions Chelicerae- 1 st pair -manipulate food Pedipalps -2 nd pair Cephalothorax Abdomen Uniramous -4 pairs walking legs ** no antenna ** no chewing
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Unformatted text preview: mandibles Horseshoe crab with cmpd eyes Crustacea Crabs, shrimps, crayfish, lobsters Isopods, copepods 2 pairs antenna Mandibles to bite and grind fod 1 st & 2 nd maxillae Variable –often cephalothorax Crabs- abdom. tucked under Biramous-swimmerets Calcium carbonate shell Isopoda –only terrestrial crust. Daphnia-water flea Myriapoda C. chilopdoa-centipedes C. Diplopoda-millipedes 1 st pair antennae Mandibles 1 st & 2 nd maxilliae Head Thorax Abdomen Uniramous Centipedes- 1 st pair of legs fangs Millipdes -diplosegments Hexapoda Insects 1 pair antennae Mandibles 1 st & 2 nd Maxillae Clearly differ. Head Thorax Abdomen Uniramous Wings in most insects...
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