Amynodontopsis jiyuanensis: A new species of Amynodont Rhinocerotoid from the Middle Eocene of Henan Province, China.
[sciencythoughts.blogspot.com]
The Amynodontidae is an extinct family of Rhinocerotoidea (Mammalia, Perissodactyla), ranging from the Middle Eocene to the Late Oligocene in North America and Eurasia. The relationship between Amynodontids and other Rhinocerotoids remains obscure. Traditionally, Amynodontids were thought to be a separate family divergent from other Rhinocerotoids at early stage of Rhinocerotoid evolution. It has been proposed that Amynodontids are closely related to Paraceratheriids and Uintaceras. Recent phylogenetic work, however, has suggested that Amynodonts, Paraceratheriids and 'Pappaceras' meiomenus comprise monophyletic clade. Amynodontids are abundant in the Middle and Late Eocene of Asia and North America, but relatively rare in Europe. Twelve genera and 32 species of Amynodontidae have been named from Asia, however, some genera were considered to be invalid and their phylogenetic relationships remained controversial. The most primitive and oldest known Amynodontid is Rostriamynodon grangeri, which was discovered from the Middle Eocene Irdin Manha Formation of the Erlian Basin in China. Thus, Asia is the most probable place of the origin of Amynodontidae.
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