Vera Eisenmann
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Amérique du Nord, North America; Mexique, Mexico

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Natural Trap, MC, Data (Natural Trap, Appendix)

Friday 18 October 2013
Like the rest of the material of Natural Trap, the third metacarpals (MC) were measured by John Howe (sheets I and II) and one student (sheets III and IV). Looking at the diagrams (Fig.1,2) it is obvious that they did not measure the diaphysis depth (4) in the same way. There is no way to (...)


Natural Trap, Humeri, Data (Natural Trap, Appendix)

Friday 18 October 2013
In Table 1, are the original data provided by John Howe (2 sheets). Scatter diagrams (Fig.1 and 2) show that Natural Trap humeri are longer than in extant E. hemionus onager (Fig.1) as well as wider and flatter (Fig.2). As in other limb bones, a few specimens seem larger, possibly because (...)


Natural Trap, Femora, Data (Natural Trap, Appendix)

Friday 18 October 2013
In Table 1 are the original data (2 sheets) provided by John Howe. One specimen was measured twice; two seem to be the left and right of the same animal. In Table 2 are the data I used (diaphysis and proximal depths were not used because they are difficult to measure and bring little (...)


Natural Trap, Calcanea, Data (Natural Trap, Appendix)

Friday 18 October 2013
In Table 1 are the original data (5 sheets) provided by John Howe; in Table 2, they are ordered by accession numbers. Most measurements were not taken in my way. For comparisons with E. hemionus onager I used scatter diagrams of the three measurements close to mine: maximal length (1), minimal (...)


Natural Trap Amerhippus cf pseudaltidens, Figures (Natural Trap Amerhippus cf pseudaltidens)

Friday 18 October 2013


Natural Trap Caballine, Text (Natural Trap, Caballine)

Friday 18 October 2013
Caballine There are a fragmentary mandible, KU 47238 (Fig.1) and a better preserved one, UNSM 51079 (Fig.2,3) associated to a palate (Fig.4). Cups are present on all lower incisors of KU 47238 and on I1-I2 of UNSM 51079. The lower (Fig.5) and upper chek teeth are caballine. I refer (with (...)


Natural Trap Amerhippus cf pseudaltidens, Text (Natural Trap Amerhippus cf pseudaltidens)

Friday 18 October 2013
Amerhippus cf. pseudaltidens The major part of Natural Trap equid fossils may be referred to A. pseudaltidens. There are few cranial remains but more than 800 limb bones. In addition, there are a few specimens larger or smaller than usual but with the same proportions; I suppose that they come (...)


Natural Trap Amerhippus conversidens, Text (Natural Trap Amerhippus conversidens)

Friday 18 October 2013
Amerhippus conversidens A beautifully preserved skull, KU 84947, was found too late to be studied by John Howe. He gave me just one good photograph of the occlusal side and several indifferent photos of the profile, dorsal side, and cheek teeth (Fig.1,2,3). There are few well preserved (...)


Natural Trap Amerhippus conversidens, Figures (Natural Trap Amerhippus conversidens)

Friday 18 October 2013


Natural Trap Caballine, Figures (Natural Trap, Caballine)

Friday 18 October 2013


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