Ashoroa
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Ashoroa Temporal range: Late Oligocene |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Infraclass: | Eutheria |
| Superorder: | Afrotheria |
| Order: | Desmostylia |
| Family: | Paleoparadoxiidae |
| Genus: |
Ashoroa Inuzuka 2000 |
| Binomial name | |
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Ashoroa laticosta Inuzuka 2000 |
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Ashoroa (named after its type locality Ashoro, Hokkaido) is an extinct genus of desmostylian, aquatic, herbivorous mammal. Fossils of Ashoroa have been found on Hokkaido, Japan (43°18′N 143°48′E / 43.3°N 143.8°E, paleocoordinates 44°36′N 141°24′E / 44.6°N 141.4°E) and were dated to the late Oligocene.
Ashoroa is the smallest and one of the oldest desmostylians with an estimated body length of 168 cm (66 in). It is known from a rib, a humerus, a femur, and three vretebrae of the single species and holotype, Ashoroa laticosta.
Ashoroa had pachyosteosclerotic (large and dense) bones. The ribs are broader than in other desmostylians, similar to sirenian ribs, and very dense, like those of Behemotops and Paleoparadoxia; and extant, semi-aquatic mammals such as Eurasian beaver and hippopotamus, but not as dense as in sirenians. The recovered long bones lack inner cavities, like in Paleoparadoxia and Desmostylus, and the trabecular pattern is different from that in Behemotops.
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