BIOL 205 Lecture Notes - Lecture 8: Thumb, Paranthropus, Linnaean Taxonomy
20 Oct 2016
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Biol 205 - chapter 21 biodiversity of vertebrate animals. Vertebrates are clades (a group of organisms that evolved from a common ancestor) of chordates (animals possessing a notochord, a dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail) First branch chordates: have a notochord, which is a flexible support rod ie. lancelets and tunicates. Monotreme: only mammals that lay eggs (ie. platypus and anteater) Marsupial: brief gestation and give birth to tiny embryonic offspring that (cid:272)o(cid:373)plete de(cid:448)elop(cid:373)e(cid:374)t atta(cid:272)hed to the (cid:373)other(cid:859)s nipples in a pouch (ie. kangaroo and opossum) Gave rise to large herbivores and predators. Have common characteristics: limber shoulder and hip joints, five highly mobile digits, feet and hands are sensitive to touch, eye position allows depth perception. Anthropoids: third group of primates (includes monkeys and apes: have a fully opposable thumb (can touch all four fingers with their thumb, long arms and short legs, relatively large brains.
