vertebrates chordates DICHOTOMOUS key diagram: walk thru ch10 tolweb TREE first.
pharyngeal slit=gill pouch in ch08 (middle ear); Deuterostomes 2nd opening=mouth: sea urchin.
Dorsal/ventral; hollow CNS filled w cerebral spinal fluid, attach muscles
Lancet, tunicate(sea squirt); lobster ventral SOLID nerve cord; fish CAUDAL fin
Terrestrial vertebrates: legs with multiple DIGITS.
PBS-YourInnerFish InnerMonkey 47:25 shark brain 49:00 Amphioxus (Lancet) CHORDATE has nerve genes for brain Chordates: The Notochord and Vertebrate Movement Giant Pyrosome and Salps: sea squirts are chordates without vertebrae
fish Bring ray-finned FISH skeleton: no arm-like joints
Jaws from slits coevolved w FINS; paired pectoral, pelvic: amphibian bones
Coelacanth discovered 1938: 4 limb; lungfish breathe air swim bladder.
Is WHALE a fish? Male sings courtship in shallow tropics - fish don't sing/parental care!
Dolphin Tale: is a dolphin a fish? Whales are mammals 1:40 Humpback calf drinks 500 l of milk per day BBC-PlanetEarth/3_ShallowSeas 1:40 Humpback calf 500 l milk in tropic - 3:50; 44(46 in MP4) poles, 5M shearwaters
PBS-YourInnerFish/ 18:30 Ichthyostega shoulder girdle like salamander: can swim/walk tetrapod w gills/lungs 365 MYA
48:30 Tiktaalik gills & lungs; forelimb bones 375 MYA Mudskipper can walk on land and breathe air Raising walking fish on land
amniotic Say amniotic FLUID. EGG is multicellular! Amphibs are also terrestrial vertebrates.
PBS-YourInnerFish InnerReptile 10:00 human fetus yolk sac (no yolk) 13:00 genes; 14:00 skin layers; shed
mammals middle ear Platypus Hunts with "Sixth Sense" - electrolocation Platypus venom spines ancestral to reptile Platypus genome 3:00 Pangaea geography Platypus genome: evolution of monotremes 180 MYA Do Dolphins Have Hair Follicles? (SeaWorld) Doggy genes and human diseases
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7=C Turner XO  9=B Klinefelter XXY  17=A chromosomes  18=C sex-link