Josephoartigasia monesi Josephoartigasia monesi Josephoartigasia monesi Josephoartigasia monesi Josephoartigasia monesi
Josephoartigasia monesi
Josephoartigasia monesi
Josephoartigasia monesi
Josephoartigasia monesi
Josephoartigasia monesi

Josephoartigasia monesi

Josephoartigasia  (Josephoartigasia Francis & Mones 1966)

 

Order: Rodentia

Family: Dinomyidae

Time period: Middle Pliocene - Early Pleistocene of South America (4 to 2 million years ago)

Size: 2,7 m in length, 150 cm in height, 800 kg of weight

Typical representative: Josephoartigasia magna Francis & Mones 1966

 

Josephoartigasia monesi, an extinct species of South American caviomorph rodent, is the largest rodent known, and lived approximately 4 to 2 million years ago during the Pliocene to early Pleistocene. The species may have weighed 1,000 kg, considerably larger than its closest living relative, the pacarana. The rodent may have lived in an estuarine environment or a delta system with forest communities, and may have eaten soft vegetation. The skull of the holotype is 53 cm long, and the remaining incisor is more than 30 cm in length. The total estimated body length is 3 m, with a height of 1.5 m.

By comparing the skull with various extant species of rodent, the authors of the original paper estimated a mass between 468 kg and 2,586 kg, with a median estimate of 1,211 kg. A later researcher revisited the numbers and came up with a more conservative estimate of 350 kg to 1,534 kg, with a median of 900 kg. (Compare 800 to 1,400 kg for an adult Black Rhinoceros.)

There is no dispute that J. monesi replaces Phoberomys pattersoni, a related and somewhat older species that lived in Venezuela during the Late Miocene, as the largest rodent. However, size comparisons are difficult because previous estimates of 400 kg and 700 kg  for P. pattersoni were based on forelimb and hindlimb elements, which are not present in the J. monesi specimen.

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Josephoartigasia  (Josephoartigasia Francis & Mones 1966)

 

Order: Rodentia

Family: Dinomyidae

Time period: Middle Pliocene - Early Pleistocene of South America (4 to 2 million years ago)

Size: 2,7 m in length, 150 cm in height, 800 kg of weight

Typical representative: Josephoartigasia magna Francis & Mones 1966

 

Josephoartigasia monesi, an extinct species of South American caviomorph rodent, is the largest rodent known, and lived approximately 4 to 2 million years ago during the Pliocene to early Pleistocene. The species may have weighed 1,000 kg, considerably larger than its closest living relative, the pacarana. The rodent may have lived in an estuarine environment or a delta system with forest communities, and may have eaten soft vegetation. The skull of the holotype is 53 cm long, and the remaining incisor is more than 30 cm in length. The total estimated body length is 3 m, with a height of 1.5 m.

By comparing the skull with various extant species of rodent, the authors of the original paper estimated a mass between 468 kg and 2,586 kg, with a median estimate of 1,211 kg. A later researcher revisited the numbers and came up with a more conservative estimate of 350 kg to 1,534 kg, with a median of 900 kg. (Compare 800 to 1,400 kg for an adult Black Rhinoceros.)

There is no dispute that J. monesi replaces Phoberomys pattersoni, a related and somewhat older species that lived in Venezuela during the Late Miocene, as the largest rodent. However, size comparisons are difficult because previous estimates of 400 kg and 700 kg  for P. pattersoni were based on forelimb and hindlimb elements, which are not present in the J. monesi specimen.

Відгуки (15):
Arka
30.11.2021
Why did Josephartigasia moniesi go extinct?
Brayden Wilson
23.04.2021
Very helpful.
Митрич
04.11.2018
Да,грандиозно! Их наверное, смилодоны с арктодусами сожрали, когда Создатель Панамский мостик перекинул из одной Америки в другую? Ром, а не мог бы ты каких-нить миоцен-плиоценовых грызунов изваять - ну там европейских или уральских дикобразов, может быть предков сурков? В США вроде, в неогене даже какие-то двурогие "сурки" или "суслики" водились! Было бы познавательно...
Jordybey
23.11.2013
Very good and very helpful. Could you add reasons for extinction though, that would be where you could improve this article to 6 starts out of 5
OLga
06.03.2013
Какие были удивительные животные!