BIO 1130 Lecture Notes - Lecture 20: Yoho National Park, Cambrian Explosion, Paleozoic

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

Document Summary

Beginning of cambrian: unlimited set of array of animals, huge experiments of body limbs and types. November 11: big finding from fossils, huge array of unusual organisms never seen other than the cambrian explosion, arthropods make an appearance, invertebrates, very beginning the common ancestor is the choanocyte. Common cell for fungi and animalia: indicates that they are linked together. Behave cooperatively: head towards multicellularity, cladogram for animalia, autapomorphies at the bottom. Cells with different functions: other than reproduction. 3: cells stick together, universal glue for all the organisms to come, animal architecture, tissues. How many make a body of an organism. Intercellular communication: none, diploblastic or triploblastic, difference between diplo and triplo, excoder, interderm and mesoderm. Symmetry abd cephalization: asymmetry, radial and bilateral symmetry. Body cavities: coelomate, pseudocoelomate, acoelomate, porifera (sponges, top of cladogram, still use choanocytes in an aquiferous (water) system, cells but no tissues, very early stage of animal evolution, no cell communication, asymmetric body plan.