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Unformatted text preview: Two pairs of antennae Appendages on most segments, mostly marine or freshwater aquatic; use gills, so require moisture or high humidity to live 5. Hexapoda: includes primitive groups of insect-like taxa and the true insects. They differ from other arthropods via embryonic development (meroblastic vs. holoblastic) and several other characters. All primitive groups are apterous (lack wings). Insecta (“true” insects). - 1 pair of antennae - 3 Major body regions - result from tagmosis (grouping into a functional unit) of segments- Head; Thorax; Abdomen - 3 pairs of walking legs - most have wings To see excellent photographs of insects in the major insect orders, go to http://www.insects.org/entophiles/index.html and for even more information http://tolweb.org/tree?group=Hexapoda&contgroup=Arthropoda Definitions: Tagma (tagmosis), characters, apterous, arthropoda, insecta, arachnda, myriapoda, crustacea,...
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- Fall '10
- Ventral nerve cord, Insecta, distinguish insects, primitive groups