Cainotherium: a basal artiodactyl

This one everyone agrees on.
Cainotherium nests at the base of included artiodactyls in the large reptile tree (LRT).

Fig. 1. Cainotherium nests at the base of the Artiodactyla or even-toed ungulates. I wonder if it had five fingers, even if vestiges, given that Ancodus, a derived artiodactyl, retains five fingers.

Fig. 1. Cainotherium nests at the base of the Artiodactyla or even-toed ungulates. I wonder if it had five fingers, even if vestiges, given that Ancodus, a derived artiodactyl, retains five fingers.

Cainotherium renggeri (Bravard 1828, 1835; 30cm in length; Eocene to Early Miocene) was and is considered a rabbit-sized artiodactyl not far from the odd-toed ungulates, like the similarly-sharp-clawed Chalicotherium.

Note that a derived artiodactyl, Ancodus (Fig. 2) had five fingers, so one wonders if Cainotherium likewise had five.

Figure 1. Ancodus nests as a more derived sister to Sus and it retains digit 1 on the manus and pes.

Figure 1. Ancodus nests as a more derived sister to Sus and it retains digit 1 on the manus and pes.

References
Bravard A 1835. Monographie du Cainotherium, Levrault, Paris, 1835.
Heizmann EPJ 1999. Family Cainotheriidae, in : Rössner G.E., Heis- sig K. (éds), The Miocene Land Mammals of Europe, Pfeil, 1999, pp. 217–220.

wiki/Cainotherium

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