Giant rat (Coryphomys), giant squirrel (Ratufa) and giant capybara (Josephoartigasia)

Another short one today.
The images say it all.

Figure 1. The giant rat (genus: Coryphomys) compared to an extant rat of typical size.

Figure 1. The giant rat (genus: Coryphomys) compared to an extant rat of typical size.

Some rodents grew really big
(by comparison to their modern counterparts). We have a giant rat (genus: Coryphomys, Fig. 1) and a giant capybara (genus: Josephoartigasia, Fig. 2; Rinderknecht & Blanco 2008), the size of a cow. The largest living rodent is the capybara (genus: Hydrochoerus). One might say it is the size of a pig with a skull larger than a human skull.

Figure 9. Josephoartigasia monesi dwarfs the largest extant rodent, Hydrochoerus, the capybara.

Figure 2. Josephoartigasia monesi dwarfs the largest extant rodent, Hydrochoerus, the capybara. That skull is 53cm long.

The giant squirrel,
Ratufa (Fig. 3; extant) at 36 cm snout/vent length is the size of a small dog.

Figure 2. Ratufa, giant Indian squirrel skeleton and in vivo image. Note the large, cat-like claws and compare them to the smaller claws on all related taxa.

Figure 2. Ratufa, giant Indian squirrel skeleton and in vivo image. Note the large, cat-like claws and compare them to the smaller claws on all related taxa.

References
Aplin et al. 2010. Quaternary Murid Rodents of Timor Part I: New Material of Coryphomys buehleri Schaub, 1937, and Description of a Second Species of the Genus. Bulletin of the American Museum of Natural History, 2010; 3411 DOI: 10.1206/692.1
Aplin KP and Helgen KM 2010. Quaternary murid rodents of Timor part I: new material of Coryphomys buehleri Schaub, 1937, and description of a second species of the genus. Bulletin of the American Museum of Natural History. 341: 1–80. doi:10.1206/692.1
Braun J, Mares M, Coyner B and Van Den Bussche R 2010. New species of Akodon (Rodentia: Cricetidae: Sigmodontinae) from central Argentina. Journal of Mammalogy, 91 (2), 387-400 DOI: 10.1644/09-MAMM-A-048.1
CSIRO Australia. Archaeologists discover biggest rat that ever lived: Weight of about 6 kilograms (over 13 lb). ScienceDaily. ScienceDaily, 26 July 2010.
Rinderknecht A, Blanco RE 2008. “The largest fossil rodent”. Proceedings of the Royal Society B. 275 (1637): 923–8.

https://en.wikipedia.org/wiki/Josephoartigasia_monesi

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