BISC 110 Lecture Notes - Lecture 5: Primary Production, Brachiopod, Ctenophora
16 Dec 2012
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Concept 32. 2: read to end of paleozoic era. Fossil record: includes, partial/complete remains of bones, shells, etc, traces of footprints, shadows, etc, preservation is biased, hard vs soft parts, abundant vs rare species, long-lived vs short-lived species, size of geographical range. Multicellularity: 2 bya: unicellular eukaryotic organisms, 1. 2 bya: oldest known fossils of multicellular organisms (small algae, bangiomorpha pubescens. Animals: multicellular, heterotrophic, eukaryotic, structural proteins (eg: collagen), nerve, and muscle cells, unique sequence of development, regulated by hox genes, small change in hox genes can have a big effect, they start unicellular, form stalk, produce spores, and cycle repeates, proves coloniality can form. Edicaran fauna: earliest known complex multicellular organisms, lived 610-542 mya, discovered by reg sprigg in 1947, and is occurred around the world. Ediacaran animals (no facial features, complicated animals: frond-like (eg: charnia, disk-like (eg: cyclomed usa, segmented (eg: spriggina)
