Véra Eisenmann

Natural Trap, Ph2, Data

vendredi 18 octobre 2013 par Véra Eisenmann

Like for the first phalanges, I received from John Howe copies of his data on second phalanges (Ph2) on separated (10) sheets. A few data were redundant, in that cases I used their mean noted ’-X’. In Table 1, you may find the original data, in Table 2 - the ones I used, and in Table 3 - the same after sorting the anterior Ph2 from the posterior.

Uusually a scatter diagram of distal articular width (6) versus maximal length (1) separates easily the anterior Ph2 (shorter and wider) from the posterior. In this case, I used the sum of minimal width (3) and distal articular width (6) versus maximal length (Fig.1).

This scatter diagram shows a bulk of slender Ph2 with little overlap and one uncertain specimen. Besides, a few phalanges seem rather large ; three rather small.
The remaining specimens are too large and/or too robust to belong with the precedent group.

Middle-sized slender Ph2 (A. cf. pseudaltidens)
Statistics (Table 4) on 87 supposed anterior Ph2 are compatible with a single form. Size and shape are similar to extant E. hemionus onager apart a smaller proximal depth (5). The corresponding bone by bone Simpson’s diagram is in Fig.2.

Statistics on supposed 80 posterior Ph2 are also compatible with a single form, not very different from the extant E. hemious onager (Table 5). The corresponding bone by bone Simpson’s diagram is in Fig.3.

Large slender Ph2
There are eight of them (Fig.4). I suppose that they come from a different level of Natural Trap.

Small slender Ph2
I do not know what to make of these three small specimens (Fig.5). The posterior, extremely slender, may be a juvenile ?

Caballine Ph2
Five anterior and seven posterior are close in size and proportions (Fig.6). to extant E. przewalskii or Mongolian horses Ph2.

A. leoni-like Ph2
I refer to A. conversidens two anterior Ph2. Although I have no data on A. leoni Ph2, this is a logical assumption in the context of other fossils of Natural Trap. One Ph2 of an extant E. africanus is smaller but otherwise not very different (Fig.7).


titre documents joints

Table 5. Natural Trap A. cf. pseudaltidens Ph1 Post, Statistics

18 octobre 2013
info document : Excel
28.5 ko

Table 4. Natural Trap A. cf. pseudaltidens Ph1 Ant, Statistics

18 octobre 2013
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30.5 ko

Table 3. Natural Trap Ph1 Ant/Post Data used, by numbers

18 octobre 2013
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36.5 ko

Table 2. Natural Trap Ph1 Data used, by numbers

18 octobre 2013
info document : Excel
39 ko

Table 1. Natural Trap Ph1 Data, sheets

18 octobre 2013
info document : Excel
30 ko

Fig.7 Natural Trap A. conversidens Ph2 Ant, Simpson’s diagrams

18 octobre 2013
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28.5 ko

Fig.6 Natural Trap Caballine Ph2, Simpson’s diagrams

18 octobre 2013
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69.5 ko

Fig.5 Natural Trap large and gracile Ph2 Post, Simpson’s diagrams

18 octobre 2013
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37 ko

Fig.4 Natural Trap large and gracile Ph2 Ant, Simpson’s diagrams

18 octobre 2013
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51.5 ko

Fig.3 Natural Trap gracile Ph2 Post, Simpson’s diagrams

18 octobre 2013
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69 ko

Fig.2 Natural Trap gracile Ph2 Ant, Simpson’s diagrams

18 octobre 2013
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57 ko

Fig.1 Natural Trap gracile Ph2, Scatter diagram (3+6) versus 1

18 octobre 2013
info document : Excel
93 ko

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