| 词条 | Gnathabelodon |
| 释义 |
| name = Gnathabelodon | fossil_range = {{Fossil range|Middle Miocene|Late Miocene}} | regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = Proboscidea | familia = †Gomphotheriidae | subfamilia = †Gnathabelodontinae | genus = †Gnathabelodon | type_species = Gnathabelodon thorpei | type_species_authority = Barbour and Sternberg, 1935[1] | subdivision_ranks = Species | subdivision =
}}Gnathabelodon is an extinct genus of gomphothere (a sister group to modern elephants) endemic to North America that includes species that lived during the Middle to Late Miocene. They were called "spoon-billed mastodons" since their lower jaw was elongated and shaped like a shoe-horn or spoon. The genus Gnathabelodon consists of two species: Thorpe's spoon-billed mastodon (G. thorpei) and Buckner's spoon-billed mastodon (G. buckneri). The flaring of the tip of their lower jaw was similar to that of the "shovel-tuskers" (Platybelodon and Amebelodon); however, Gnathabelodon species are distinct in having no lower tusks whilst the "shovel tuskers" have broad, flattened lower tusks. The upper tusks are large and curve outwards and upwards. With respect to dentition and overall body form, it was similar to species of Gomphotherium, but Mothe et al. (2016) recover Gnathabelodon as closer to brevirostrine gomphotheriids than to Gomphotherium.[2] References1. ^Barbour, E.H. and Sternberg, G. (1935). Gnathabelodon thorpei, gen. et sp. nov. A new mud-grubbing mastodon.Bulletin of the Nebraska State Museum, 42: 395-404. 2. ^Mothé, Dimila; Ferretti, Marco P.; Avilla, Leonardo S. (12 January 2016). "The Dance of Tusks: Rediscovery of Lower Incisors in the Pan-American Proboscidean Cuvieronius hyodon Revises Incisor Evolution in Elephantimorpha". PLOS ONE. doi:10.1371/journal.pone.0147009. Retrieved 4 May 2017. Sources
5 : Miocene proboscideans|Gomphotheres|Miocene mammals of North America|Prehistoric mammals of North America|Prehistoric mammal genera |
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