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Annelids, Onychophora - Annelids Onychophora A...

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Annelids, Onychophora A. Annelida- “little rings” 1. Segmented worms a. external- grooves b. internal- septa, transverse paddles 2. Specialization a. metamerism- the same structures repeated in each segment 3. Hydrostatic skeleton- coelom filled with fluid 4. Setae- bristle-like feet used for locomotion 5. Examples a. class: Polychaeta- “many setae,” a lot of setae on each segment, setae are poisonous b. class: Oligochaeta- “few setae,” about four pairs on each segment - Lumbricus terrestris- “earth worms,” freshwater, moist terrestrial, 100 segments, cuticle (has a mucus coating to keep moist)
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i. circular muscles, longitudinal muscles- used in alternation for movement ii. soil- worms aerate, turn over, and fertilize soil with Nitrogenous waste iii. digestive system- mouth, pharynx (muscular- swallowing), esophagus (tube connects pharynx to stomach), stomach (crop- flexable, storage, gizzard- tough, grinding), anus (excretion of waste (1) typhlosole- fold in dorsal end of intestine, increased surface area, more absorption iv. circulatory system- closed
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