BIOL 215 Lecture Notes - Lecture 6: Dinos, Polychaete, Acanthostega
25 Jan 2018
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10:10 am: today: finish radiations, move into modern diversity 2. Finish lecture on cambrian radiation: biodiversity survey of modern fauna, plants! Radiations: what are the consequences of independent evolution and novelty, 1 of the consequences of inventing new structures is that you can trigger what you might call adaptive radiations. Adaptive radiation: evolutionary divergence of members of a single phylogenetic lineage into a variety of different adaptive forms over a relatively short interval of geological time: will usually end up with a comb. For the exam: not focusing on the times, but focusing on the periods of the radiations of life. (dates differ from book to book) Land plants appear (the bryophytes and the ferns, not the flowering plants on the right (gymosperms and angiosperms)) The devonian: radiation of fishes, everything you see of the modern fishes. Carboniferous: appearance of early reptiles/insects/amphibians, acanthostega: a transitional form, reptile/amphibian that can live on land and under water, eight toes.
