''Aepycamelus'' is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

camelid Camelids are members of the biological family Camelidae, the only currently living family in the suborder Tylopoda. The seven extant members of this group are: dromedary camels, Bactrian camels, wild Bactrian camels, llamas, alpacas, vicuñas, ...

s that lived during the

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

20.6–4.9 million years ago, existing for about . Its name is derived from the

Homeric Greek Homeric Greek is the form of the Greek language that was used by Homer in the '' Iliad'', '' Odyssey'', and Homeric Hymns. It is a literary dialect of Ancient Greek consisting mainly of Ionic, with some Aeolic forms, a few from Arcadocypriot, ...

, "high and steep" and κάμηλος – "camel"; thus, "high camel"; ''alticamelus'' in

Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...

. ''Aepycamelus'' spp. walked on their toes only. Unlike earlier

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriat ...

of camelids, they possessed cushioned pads like those of modern

camel A camel (from: la, camelus and grc-gre, κάμηλος (''kamēlos'') from Hebrew or Phoenician: גָמָל ''gāmāl''.) is an even-toed ungulate in the genus ''Camelus'' that bears distinctive fatty deposits known as "humps" on its back. ...

Taxonomy

''Aepycamelus'' was formerly referred to the genus ''Alticamelus'', which Matthew (1901) erected for ''"Procamelus" altus'' Marsh, 1894, a camel species described from a calcaneum found in Neogene deposits in Oregon, after he referred a complete skeleton of a tall camel from Colorado to that species. Matthew and Cook (1909) erected ''Alticamelus giraffinus'' for the Colorado specimen after recognizing the ''A. altus'' holotype as indeterminate. MacDonald (1956) recognized ''Alticamelus'' as a'' nomen dubium'' and erected ''Aepycamelus'' for species previously assigned to ''Alticamelus''.J. R. Macdonald. 1956. A new Clarendonian mammalian fauna from the Truckee Formation of western Nevada. Journal of Paleontology 30(1):186-202.

Morphology

''Aepycamelus'' was a

prairie Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as the ...

dweller of

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and th ...

(

Colorado Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of the ...

, etc.). It was a highly specialized animal. Its head was relatively small compared with the rest of its body, its neck was long, as a result of

giraffe The giraffe is a large African hoofed mammal belonging to the genus ''Giraffa''. It is the tallest living terrestrial animal and the largest ruminant on Earth. Traditionally, giraffes were thought to be one species, '' Giraffa camelopardal ...

-like lengthening of the

cervical vertebrae In tetrapods, cervical vertebrae (singular: vertebra) are the vertebrae of the neck, immediately below the skull. Truncal vertebrae (divided into thoracic and lumbar vertebrae in mammals) lie caudal (toward the tail) of cervical vertebrae. In ...

, and its legs were long and stilt-like, with the elbow and knee joints on the same level. The top of its head was about above the ground. Its strange body structure gives information on its mode of life and habits. ''Aepycamelus'' obviously inhabited dry

grassland A grassland is an area where the vegetation is dominated by grasses ( Poaceae). However, sedge ( Cyperaceae) and rush ( Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur na ...

s with groups of trees. It is presumed to have moved about singly or in small groups, like today's giraffes, and like them, browsed high up in the trees. In this respect, it had no competitors. It survived a relatively long time, through most of the Miocene epoch, and died out prior to the start of the

Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58

Fossil distribution

Its

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

are distributed widely, from

Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columb ...

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and ...

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...

Taxonomy

Morphology

Fossil distribution

References

Further reading