A tiny Late Jurassic pre-rabbit: Henkelotherium

This earlier tracing and nesting
saw improvement with a higher resolution image.

Figure 1. Henkelotherium, a traditional pantothere, nests as a Late Jurassic pre-rabbit in the LRT.

Figure 1. Henkelotherium, a traditional pantothere, nests as a Late Jurassic pre-rabbit in the LRT. Image about 3.5x life size.

Henkelotherium guimarotae (Krebs 1991; Late Jurassic 150 mya; Figs. 1-3) was traditionally considered a pantothere or eupantothere. Here Henkelotherium nests with rabbits as a Late Jurassic member of the clade Glires. Like its sisters, the manus was small and the pes had long digits with sharp claws. The lumbar region was long and flexible. A tiny taxon, the image below (Fig. 2) is about twice natural size.

Figure 2. Henkelotherium reconstructed from DGS tracings in figure 1. Note the tiny manus and large pes, traits that continue into extant rabbits.

Figure 2. Henkelotherium reconstructed from DGS tracings in figure 1. Note the tiny manus and large pes, traits that continue into extant rabbits. Image about twice life size. What looks like an eye here is just a tracing of bone cracks, probably in the frontal.

Wikipedia reports
“Eupantotheres are derived compared to symmetrodonts in having wider upper than lower teeth (although they still lack the protocone of tribosphenic forms.” The large reptile tree does not recover this clade. Rather the clade Lagomorpha should be extended to include the taxa found here (Fig. 3).

Figure 3. The Lagomorpha clade with the addition of Henkelotherium.

Figure 3. The Lagomorpha clade with the addition of Henkelotherium.

References
Krebs B 1991. Skelett von Henkelotherium guimarotae gen. et sp. nov. (Eupantotheria, Mammalia) aus dem Oberen Jura von Portugal. Berl Geowiss Abh A.: 133:1–110.

wiki/Henkelotherium

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