Tanupolama Stock 1928 Holomeniscus Cope 1884 Hemiauchenia[1] is a genus of lamine camelids that evolved in North America in the Miocene period about 10 million years ago.

This genus diversified and entered South America in the Late Pliocene about three to two million years ago, as part of the Great American Biotic Interchange.

[2][3] The genus name is derived from the Ancient Greek: ἡμι- (hēmi-, "half"-)[4] and αὐχήν (auchēn, "neck").

[7][8] The "large-headed llama", H. macrocephala, was widely distributed in North and Central America, with H. vera being known from the western United States and northern Mexico.

[15] This has been accepted by all subsequent researchers, although in 2013, Carolina Saldanha Scherer questioned the inclusion of a certain North American species and suggested that Hemiauchenia is paraphyletic.