BIO 1130 Study Guide - Final Guide: Sponge, Buoyancy, Devonian
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BIO 1130 Full Course Notes
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De nition: condition where the blastula has two primary germ layers endoderm and ectoderm (no mesoderm, endoderm allows development of true tissue, ex. tissues of the gut, e. g. jellyfish, corals. Triploblastic: an organism that contains three types of tissues in the blastula: the ectoderm, the endoderm and the mesoderm, tripoblasty is an apomorphy that defines the two clades of protostomes and deuterostomes, organisms with triploblasty usually possess bilateral symmetry. Doushantuo fossils: dated from 580 542 ma (50 ma before the cambrian), found in. Ediacaran fossils: dated from 580 542 ma, slightly younger than the doushantuo. Ectoderm: outer covering which will form the skin, nails, hair and nervous. The human liver, pancreas, gall bladder, thyroid gland, parathyroid glands, and thymus. Epitheliomusculature: an autapomorphky of the cnidaria, are cells that form part of the epithelium, but extend their bases to form muscle fibres, fibres of the outward layer are perpendicular to the fibres of the inward layer.
