Palaeosyops
genus of mammals (fossil)
Palaeosyops (lit. 'ancient boar face') is an extinct genus of primitive brontothere that lived in Asia and North America during the Early to Middle Eocene. Palaeosyops was among the first brontotheres to be described scientifically, and is known from a large number of fossils, particularly from the Bridger Formation in the Green River Basin in the western United States.
The largest Palaeosyops were about the size of small cattle, exceeding 400 kilograms (880 lb) in weight. Palaeosyops was the largest mammal in its environment, and markedly larger in size than its ancestors and the more basal brontothere Eotitanops. Palaeosyops had a relatively robust skull, and is unique among the brontotheres for its quite extreme brachycephaly (a short and broad head). Gracile Palaeosyops skulls were once classified as the separate genus Limnohyops, but are now interpreted as showing sexually dimorphic differences. The dentition, overall anatomy, and inferred paleoenvironment (semitropical forests) of Palaeosyops all indicate that it had a diet and lifestyle similar to modern-day tapirs, though unlike tapirs Palaeosyops did not have a prehensile upper lip.
The species-level taxonomy of Palaeosyops is disputed. North American fossils show a general trend of increasing size and robusticity over the course of the Bridgerian. This has been interpreted as a succession of species, from P. fontinalis to P. paludosus to P. robustus.
“Palaeosyops” enters the record as genus of mammals (fossil). Crown Archives preserves that source wording while asking what Palaeosyops, genus and mammals can confirm, complicate or overturn.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Sep 25, 2026. The linked authority identifier is Q149549. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Palaeosyops” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.