Animal_Body_Plans[1]

Animal_Body_Plans[1] - Animal Architecture Major Body Plans...

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Unformatted text preview: Animal Architecture Major Body Plans of Animals There are 35 phyla of animals, with many shapes, colors, and modes of living Animal Diversity All but one are invertebrates Our species belongs to that minor phylum, the Chordata Class Mammalia Order Primates Family Hominidae Homo sapiens We Chordates represent only 42,000 of the millions of species on the earth. Most chordates are Fsh. Mammals represent only 4000! Topics of Todays Lecture When did the major body plans (phyla) arise What was the Cambrian the explosion and why was it important in the evolution of animal body plans What are the major features of animal body plans How do animal phylogenies based on body plan characteristics compare with those based on molecular similarities? 570-600 MYA First evidence of fossil animals: Timeline for Animal Evolution Trace fossils Burrows, worm trails, etc Impressions of animals Even embryos! Recently, a microscopic fossil interpreted as a bilaterally symmetrical animal was found, dating back to 580-600 MYA Vernanimalcula 540-560 MYA First extensive fossils of animals The Ediacaran fauna, named for an area in Australia where they were rst discovered. These fossils are impressions of strange, at animals that are mostly difcult to place in modern phyla. Most disappeared from the fossil record before the Cambrian Period began....
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This note was uploaded on 09/23/2011 for the course BIOL 240 taught by Professor Staff during the Spring '11 term at S.F. State.

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Animal_Body_Plans[1] - Animal Architecture Major Body Plans...

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