BIOL 202 Lecture Notes - Lecture 2: Polyphyly, Parazoa, Deuterostome
14 Apr 2017
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Groupings reflect organization from shared evolutionary histories. Taxa (very general, might not reflect shared evolutionary histories) Phylogeny (specifically about evolutionary history, to illustrate it, understand it. Phylogenetic table on slide 4: for fireflies, bioluminescence. We use: d, k, p, c, o, f, g, s as hierarchy to map relatedness. Slide 6: look at taxa in each grouping to give us an estimate of how much, for example, phyla there are. We found a lot of classes, estimate that there are about 90 thousand. Probably discovered about 85% genus, for species, still same discovery rate. All this leads us to estimate that we"ve only discovered about 10% of all the species on earth. Feeding stages attach to the mouthparts of lobsters. New phyla because of strange life cycle: eubacteria bacteria. Systematics: study of evolutionary relationships among taxa based on characters that indicate relatedness. Characters: are any heritable attribute those that are more similar indicate greater relatedness.
