BIOL 2030 Chapter Notes - Chapter 5: Prostomium, Parapodium, Acicula
26 Apr 2016
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Strictly marine, mud/debris @ coastal waters, in burrows with mucus. Parapodia paired body extensions; terminal anus; well-developed head: pharynx may evert, prostomium triangular projection above mouth, prostomial tentacles, palps, & 2 pairs of beadlike eyes, peristomium : first complete ring-like segment around mouth; 1st segment where mouth is; prostomium ovehangs 1st segment. Nephridiopore small external opening of nephridia; pair on each segment, (but 1st three & last anus) Clitellum enlarged saddle-like structure @ 31/32-37 (secretes cocoon, where eggs are deposited) Cuticle, epidermis, circular muscle layer, longitudinal muscle layer, peritoneum (thin layer of epithelial cells lining space between muscles & intestine) Chloragogen cells surround intestine; synthesize glycogen, deaminate proteins & form urea. Typhlosole dorsal infolding of the intestine increase sa! Ventral, dorsal nerve chords (wrt intestine); blood vessels, & sub-neural vessel (below nerve cord: nephridia, too. Septa are perforate (fluid passes freely through body cavity) Pharynx enlarged, segment 4; dorsal blood vessel on alimentary canal.
