Lecture 14

Lecture 14 - Lecture 14- Paleozoic Marine Life A....

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Lecture 14- Paleozoic Marine Life A. Morphological disparity vs. diversity- Disparity- degree of “differentness” and diversity different, species richness High morphological disparity- thing look really different from each other B. S.J. Gould- Important role of contingency: most Cambrian “phyla” went extinct, a good adaptive body plan is important but probably somewhat random If you “replayed the tape” would humans exist? Current view: early phylogenetic groupings are less important, focuses on stem groups and crown groups, not naming numerous phyla C. The Cambrian Conundrum- huge amount of diversification in a very short amount of geologic time, some animals appear to come out of nowhere Solution to question 1. There is a hidden history of animal evolution- many early animals not preservable 2. The fossil record tells it like it is- Animals underwent a spectacular diversification in the first ~20 Ma of the Cambrian o Skeletal fossils tells us that independent evolution of hard parts was part
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Lecture 14 - Lecture 14- Paleozoic Marine Life A....

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