Ashoroa
Species of mammal (fossil)
title: "Ashoroa" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["desmostylians", "chattian-life", "monotypic-prehistoric-placental-genera", "oligocene-mammals-of-asia", "fossils-of-japan", "fossil-taxa-described-in-2000"] description: "Species of mammal (fossil)" topic_path: "geography/japan" source: "https://en.wikipedia.org/wiki/Ashoroa" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Species of mammal (fossil) ::
| image = Ashoroa laticosta in Hokkaido University Museum 02.jpg | image_caption = Mounted skeleton in Hokkaido University Museum | genus = Ashoroa | parent_authority = Inuzuka, 2000 | species = laticosta | authority = Inuzuka, 2000 | fossil_range = Chattian ~
Ashoroa (named after its type locality Ashoro, Hokkaido) is an extinct genus of desmostylian, aquatic, herbivorous mammal. Fossils of Ashoroa have been found in the Morawan Formation on Hokkaido, Japan (, paleocoordinates ) and were dated to the late Oligocene.
Description
::figure[src="https://upload.wikimedia.org/wikipedia/commons/8/80/Ashoroa.jpg" caption="Skeletal diagram"] ::
Ashoroa is the smallest and one of the oldest desmostylians with an estimated body length of 168 cm. It is known from a rib, a humerus, a femur, and three vertebrae 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.
interpreted Ashoroa, together with Behemotops and Paleoparadoxia. as a "shallow water swimmer, either hovering slowly at a preferred depth, or walking on the bottom".
References
Bibliography
- {{Cite journal | last = Inuzuka | first = N. | title = Primitive late Oligocene desmostylians from Japan and Phylogeny of the Desmostylia | year = 2000 | journal = Bulletin of the Ashoro Museum of Paleontology | volume = 1 | pages = 91–123
- {{Cite journal | last1 = Hayashi | first1 = Shoji | last2 = Houssaye | first2 = Alexandra | last3 = Nakajima | first3 = Yasuhisa | last4 = Kentaro | first4 = Chiba | last5 = Ando | first5 = Tatsuro | last6 = Sawamura | first6 = Hiroshi | last7 = Inuzuka | first7 = Norihisa | last8 = Kaneko | first8 = Naotomo | last9 = Osaki | first9 = Tomohiro | title = Bone Inner Structure Suggests Increasing Aquatic Adaptations in Desmostylia (Mammalia, Afrotheria) | year = 2013 | journal = PLOS ONE | volume = 8 | issue = 4 | article-number = e59146 | doi = 10.1371/journal.pone.0059146 | oclc = 837402105 | pmid=23565143 | pmc=3615000| bibcode = 2013PLoSO...859146H | doi-access = free
References
- {{Paleodb. 71795. Ashoroa laticosta. Retrieved March 2013
- {{Paleodb. 58896. Morawan (Lower Hard Shale Member) (Oligocene of Japan). Retrieved March 2013.
- {{Harvnb. Hayashi. Houssaye. Nakajima. Kentaro. 2013
- {{Harvnb. Hayashi. Houssaye. Nakajima. Kentaro. 2013
- {{Harvnb. Hayashi. Houssaye. Nakajima. Kentaro. 2013
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