BIO 1130 Lecture Notes - Lecture 11: Paleozoic, Suction Cup, Fish Scale

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

Phanerozoic paleozoic era: silurian and devonian (lectures 11-12) Arthropods: trilopods (some, marine forms (crustacea) Sea between land mass is protected: place for experimentation, good sun exposure and proximity to land. Adaptive pressure came along and only some organisms could survive (extinction) Animal swims with mouth open and water washed over gills. Endostyle at base of pharynx: produced mucous sheet, gets passed up by cilia, mesh structure food particles get trapped water can move through mesh, but not the food, propelled into digestive track. Cannot stretch these muscles on both sides: one side stretches at a time, notochord will flex/bend (wiggle) New part of body called tail that is responsible for waggle movement. Add segments to their body posterior to the anal opening. No organs in this extended segments, this is now the tail. Burrows in soft material with mouth sticking out. Tails is very s(cid:373)all (cid:271)e(cid:272)ause there"s (cid:374)ot a lot of (cid:373)ove(cid:373)e(cid:374)t.