Biology 3229F/G Study Guide - Final Guide: Japanese Spider Crab, Ascaris Lumbricoides, Ascaris Suum
28 Sep 2017
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It is not a grouping of convenience; vertebrate vs. invertebrate would be for convenience. Life, domain, kingdom, phylum, class, order, family, genus, species. Convergent evolution (i. e. bats vs. birds) same selection pressures could create similarities amongst very different organisms; you need to look at ancestry instead! Random fact: cancer affected epithelial cells looked like crab/crab cells under microscope to the british guy that dis(cid:272)o(cid:448)ered (cid:272)a(cid:374)(cid:272)er. A phylogenetic tree = a hypothesis of the expected relatedness between organisms: will be different depending on authors; lumpers vs. splitters when developing trees. Here is the tree of life; 34 phyla of animals that the species can be grouped into. Black ones: pretty set in stone with good evidence of their placement. Note chordata is (cid:374)ot e(cid:454)(cid:272)lusi(cid:448)e to orga(cid:374)is(cid:373)s (cid:449)ith (cid:271)a(cid:272)k(cid:271)o(cid:374)es . Circularity (i. e. in starfish) is secondarily derived too. Note clades are not groupings of convenience like vertebrate vs. invertebrate. Deuterostomia vs. protostomia is one of the biggest splits that we should recognize.
