EEB202H1 Lecture Notes - Lecture 1: Crustacean, Arthropod, Hexapoda
25 Jan 2016
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Document Summary
In the articulata , along with segmented worms (annelida) In the ecdysozoa , with other invertebrates that shed their cuticle. Hardened into plates ,scleritis, seperated by exible membranes. Waterproo ng layer, important for the invasion of land. Tagmosis: grouping of segments into functional groups or tagma. Opabinia) resulted in the perfection of diverse body plans. Major groups of archnida a. b. c. d. e. Tagmata : myriapods -head and trunk ; trachea , moist habitats a. b. Hexapods - head, thorax and abdomen ;3 pairs of walking legs, 3 tagmata a. b. Subdivided into sclerites that are some rated by joints and moveable by muscles. Head: bears the compound eyes and sensory antenna. Thorax: three segments, each bearing a leg , also wings. Abdomen: no more then 10-11 visible segments and lacks appendages expect external genitalia. Internal body cavity : called hemocoel , is lled with muscles , viscera and the blood.
