Palaeotherium (/ˌpæliˈoʊθɛriəm/) is an extinct genus of prehistoric ungulate that inhabited Eurasia during the Eocene epoch. The word is spelled with "ae" instead of "e" in order to reflect its Greek origin, where "ai" is pronounced as "e". The "o" in "therium" is long because the stress falls on the third syllable, which is marked with a macron in the phonetic transcription. Despite its complexity, the spelling of palaeotherium conforms to English conventions for scientific names based on classical languages.
Palaeotherium is an extinct, herbivorous mammal belonging to the family Palaeotheriidae, which lived during the Eocene epoch, approximately 55 to 34 million years ago. This creature is considered one of the earliest known types of ancestor to the modern horse.
The name "palaeotherium" is derived from the Greek words "palaios," meaning ancient, and "therion," which translates to animal, hinting at the animal's ancient origins. It is estimated that palaeotheriums stood approximately 1 meter tall at the shoulder, with a length of around 2 meters (including the tail), resembling a small horse in appearance.
Characteristically, palaeotheriums possessed four-toed feet, with the middle pair being larger and more weight-bearing than the outer toes. These mammals had a relatively long head, equipped with complex teeth adapted for grinding plant material. They likely inhabited forested areas, feeding on leaves, fruits, and other vegetation available to them.
Palaeotheriums are considered vital in the evolutionary history of hooved mammals. Through various anatomical changes over millions of years, they gradually transformed into the early horse species known as Orohippus and eventually led to the development of contemporary equines.
Fossil remains of palaeotheriums have been discovered in Europe, particularly in France and England. The study of these fossils provides crucial insights into the evolution and diversification of hoofed mammals, enriching our understanding of the natural history of horses.
In geol., a fossil pachydermatous or thick-skinned animal, found in the Eocene Tertiaries.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "palaeotherium" has a Greek origin. It is derived from the combination of two Greek words: "palaios" meaning "ancient" or "old", and "therion" meaning "beast" or "animal". Therefore, "palaeotherium" can be translated to mean "ancient beast" or "ancient animal". Palaeotherium is also the name of an extinct genus of mammals, which were early horse ancestors.