BIOL 2030 Lecture Notes - Lecture 16: Sacabambaspis, Endoskeleton, Human Musculoskeletal System
17 Sep 2015
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Physiological modifications/ processes: related to metabolic energy in the respiratory acids that are associated with more activity. Sacabambaspis (~550 mya) its jawless. One of the earliest complete fossils of fishes: discovered by a canadian graduate student in the early 1800s. Increased musculature of gills pump water to get gas. **unique in vertebrates don"t see it in invertebrate. Ectodermal placodes don"t find it in invertebrate chordates. Plate- like ectodermal thickenings (either side of neural tube) turn into a variety of different structures: e. x. E. x. shark gills if look at cross- section they look like teeth: 1. Superclass gnathostomata (jawed vertebrates: 1. Sharks, rays, skates, subclass of ratfish: 2. Subphylum vertebrata: split into 2 super classes. Coelocanth (resurrected from the dead; thought they were extinct for about 70 my discovered by a south. African women in 1938 marjorie courtenay- latimer), lungfish. They also use this method to get rid of slim. Shamils: slime functions include, aid in burrowing.
