Allactaga and Pedetes enter the LRT

Those leaping rodents from Africa,
jerboas (genus: Allactaga) and jumping hares (genus: Pedetes, Fig. 1), are more closely related to chinchillas and guinea pigs (Cavia), than to the marsupial kangaroos (Macropus) they converge with.

Allactaga major (Cuvier 1836; Late Miocene to present; snout-vent length 5–15cm; Fig. 1) is the extant jerboa, a nocturnal bipedal rodent that burrows into sand during the day. The long hind limbs help it hop, like a kangaroo, zig-zagging over long distances, and avoid attacking owls. They can hurdle several feet in a single bounce. Some have short ears, others have giant ears for cooling. Closest relatives in the LRT include Pedetes and Chinchilla, not the traditional Mus.

Figure 1. Skeletons of Pedetes and Allactaga to scale.

Figure 1. Skeletons of Pedetes and Allactaga to scale. Not sure yet if the jerboa is a miniature spring hare, or if the spring hare is a giant jerboa.

Figure 3. The spring hare (Pedetes) nests with the jerboa (Allactaga) in the LRT.

Figure 2. The spring hare (Pedetes) nests with the jerboa (Allactaga) in the LRT.

Pedetes capensis (Illiger 1811; snout-vent length: 35-45cm; Figs. 1, 2) is the extant South African springhare, a diurnal burrower and a nocturnal hopper native to South Africa. Pedal digit 1 is absent. Young are born with fur and are active within days.


References
Cuvier F 1836. Proceedings of the Zoololgical Society of London 1836:141.
Illiger 1811. Prodromus systematis mammalium et avium additis terminis zoographicis utriusque classis, eorumque versione germanica. Sumptibus C. Salfeld, Berolini [Berlin]: [I]-XVIII, [1]-301.

wiki/Allactaga
wiki/Pedetes

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