BIOL-1507EL Lecture Notes - Lecture 2: Gastrovascular Cavity, Germ Layer, Mesohyl
21 Jan 2018
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Animals with solid bodies, that is with out caviber between that guts and outer body plan, are referred to as the acoelmatas (without a hallow from greek) this group of animals comprise; flatworms and animals from few other phyla. If the cavity lined with a mesoderm, it has a true coelom the group known as coelomates. Based on the mode of the coelom formation and other differences in embryology, the coelomates divided into distinct evolutionary lines. Phylum porifera sponges: simply means it bears pores, water enter these pores and passes through the central cavity (spongocoel), and finally flows out of the osculum, water kept moving by the action of flagellated cells known as choanocytes. Comb jellies: are considered the largest animals that use cilia for locomotion, with sensory organ that function in orientation, which control the movement of the comb cilia the tentacles bear adhesive structures called colloblasts. Classes: class turbellaria, class trematoda flukes, class monogenea, class cestoda tapeworm.
