Homalodotherium
genus of mammals (fossil)
Homalodotherium is an extinct genus of South American native ungulates in the order Notoungulata. Fossils of Homalodotherium have been found in the Middle Miocene (Friasian in the SALMA classification) Santa Cruz Formation of Argentina and the Río Frías Formation of Chile. The first specimen, a partial skull, was discovered by Robert Holiver Cunningham while on an expedition to Patagonia. By the time it had arrived in England, it was degraded to the point where only a few elements remained. Regardless, in 1870, it was given its genus name by Thomas Henry Huxley, and its species name (H. cunninghami, after its discoverer) by William Henry Flower. The name was misspelled repeatedly over the years, leading to the erection of the family Homalodontotheriidae to include it, though this has since been amended to Homalodotheriidae. Since, then four more species of Homalodotherium have been named.
Homalodotherium was a fairly large animal, with a body length of 2 m (6.6 ft) and a body mass of 250–350 kg (550–770 lb). It had a proportionally small head with broad, flat, teeth, and, unusually for South American native ungulates, large claws on its forelimbs. Initially, it was suggested that these were used for digging.
Begin with the source’s own compact description: “Homalodotherium” is genus of mammals (fossil). The dossier treats that line as a proposition to test through Homalodotherium, genus and mammals, not as a finished interpretation.
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The phrase “genus of mammals (fossil)” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Aug 17, 2026. The linked authority identifier is Q1038090. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1870.
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This entry incorporates text from “Homalodotherium” 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.