ls1-section-d-horse-evolution-worksheet - Table C-3 Chart...

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Table C-3: Chart for recording qualitative Fossil Species Skull Characters Hyracotherium (Eocene 55mya) sharp features, eyesockets forward on skull, less elongated Mesohippus (Oligocene 34 mya) long and narrow; big eye socket compared to brain size;top of skull is flat; rosterum is same length as cranium but narrower Merychippus (Miocene 23 mya) long, thin mandible; long rostrum; small cranium; masseter increased from previous species Pleshippus (Pliocene 5mya) larger rostrum compared to to cranium, premaxallae is less sharp Equus (Pleistocene 1.8 mya) long, narrow rostrum; long upper masseter att. points; deep mandible
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e observations of horse fossil specimens Limb Characters Dental Characters 10 molars, 6 incisors, 6 canines on top and bottom multiple on digits on both limbs, back limb elongated, many tendons 14 molars, 6 incisors, and 2 canines on top; 12 molars on bottom; molars are sharp; canines not very sharp; look more like grazer teeth about 8 inches long, 4 phalanges with 1 really tiny grazer, 12 cheek molars, 6 incisors, 2 canines and 2 premolars 3 phalanges (2 small, one large in center); thin short leg relative to head size huge jaw, less # of ridges for
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This note was uploaded on 06/03/2011 for the course LS 1 taught by Professor Thomas during the Spring '05 term at UCLA.

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ls1-section-d-horse-evolution-worksheet - Table C-3 Chart...

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