BIO 112 Lecture 4: 4 Lophotrochozoans Part 2 Outline Zoology 4
5 Oct 2016
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Cephalopods (head foot: body arrangement= foot, head, body) Mantle: acts as a body covering; secrete the shell. Common features (ancestral but not all have them): Sensory cells and organs on body surface similar to others. Many have image-forming eyes with varying levels of sight: Nerve ring around esophagus and several longitudinal nerve cords. Gas exchange through body surface/mantle are highly vascularized tissues that pull gases from the water circulatory system with a in most. Excretion collected by circulatory system and dumped into coelom filter out of coelom and dump into. Some polychaetes, all oligochaetes ( few long hairs ), and all leeches. Oligochaetes include earthworms and some freshwater worms. No setae, dorsoventrally flattened, more superficial segmentation. Gases exchanged across skin circulatory system with five hearts (pumping vessels) in every segment for ridding of metabolic waste. Muscles in body wall to make short and fat to make long and thin.
