Gomphotherium

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Gomphotherium
Temporal range: Early Miocene to Early Pliocene (Aquitanian to Zanclean) 19.5–5  Ma
Gophotherium at AMNH.jpg
Specimen of Gomphotherium productum at the American Museum of Natural History
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Proboscidea
Family: Gomphotheriidae
Genus: Gomphotherium
Burmeister, 1837
Type species
Gomphotherium angustidens
(Cuvier, 1817)
Species

See text

Synonyms
  • Trilophodon
    Falconer and Cautley, 1846
  • Bunolophodon
    Vacek, 1877
  • Tetrabelodon
    Cope, 1884
  • Serridentinus
    Osborn, 1923
  • Trobelodon
    Frick, 1933
  • Ocalientinus
    Frick, 1933
  • Tatabelodon
    Frick, 1933

Gomphotherium ( /ˌɡɒmfəˈθɪəriəm/ ; "nail beast" for its double set of straight tusks) is an extinct genus of gomphothere proboscidean from the Neogene of Eurasia, Africa and North America. [1] [2] It is the most diverse genus of gomphothere, with over a dozen valid species. The genus is probably paraphyletic. [3] [4]

Contents

Description

Skeletal restoration of G. productum (right) and G. steinheimense (left) compared to a human Gomphotherium skeletals.png
Skeletal restoration of G. productum (right) and G. steinheimense (left) compared to a human

Most species of Gomphotherium were similar in size to the Asian elephant, with G. productum (known from a 35-year-old male) measuring 2.51 m (8 ft 3 in) tall and weighing 4.6 t (4.5 long tons; 5.1 short tons). The largest species G. steinheimense, known from a complete 37-year-old male found in Mühldorf, Germany, measured up to 3.17 m (10.4 ft) tall and weighed 6.7 t (6.6 long tons; 7.4 short tons). [5]

Gomphotherium, like most basal elephantimorphs, had an elongated lower jaw which bore tusks. [6] Species of Gomphotherium are defined by their conservative molar morphology, which includes "trilophed intermediate molars, third molars with three to four loph(id)s, and pretrite half-loph(id)s typically with anterior and posterior accessory conules that form trefoil-patterned enamel loops with wear (simple molar crowns with no accessory conules on the posttrite side of the crown)". [7]

Ecology

Most species of Gomphotherium are inferred to have been browsers or mixed feeders, but specimens of G. steinheimense from China are suggested to have been grazers. [3] Oxygen and carbon isotopes from G. productum enamel unearthed in the Port of Entry Pit, Oklahoma reveal it fed predominantly on C3 plants year-round. [8]

Evolution

Gomphotherium likely originated in Africa during the late Oligocene-early Miocene. The oldest remains of Gomphotherium are known from Africa, dating to approximately 19.5 million years ago. [9] Gomphotherium migrated into Eurasia across the "Gomphotherium land bridge" approximately 19 million years ago. [10] Gomphotherium underwent rapid evolution after its arrival in Eurasia, reaching its peak diversity during the Early-Middle Miocene. [10] Gomphotherium has been posited to be paraphyletic and the ancestor of later gomphothere genera, including the "tetralophodont gomphotheres" such as Tetralophodon which are probably ancestral to stegodontids and elephantids. [3] Gomphotherium first arrived in North America during the mid-Miocene, approximately 16-15 million years ago, [11] and is suggested to be ancestral to later New World gomphothere genera, such as Cuvieronius , Stegomastodon and Rhynchotherium. [12] Asian populations of Gomphotherium are suggested to have been ancestral to Sinomastodon . [13] The last European species of Gomphotherium became extinct at the beginning of the Late Miocene, around the start of MN9, approximately 10 million years ago. [13] The last Gomphotherium species disappeared from North America at the beginning of the Pliocene, approximately 5 million years ago. [11]

Taxonomy

Species

Detail of Gomphotherium skeleton at the American Museum of Natural History AMNH Gomphotherium productum.jpg
Detail of Gomphotherium skeleton at the American Museum of Natural History
Front view of G. productum. Collected from Clarendon, Texas. At the AMNH. Gomphotherium productum skeleton 3 (cropped).jpg
Front view of G. productum. Collected from Clarendon, Texas. At the AMNH.

Over a dozen species of Gomphotherium are considered valid, with over 30 junior synonyms proposed for these taxa. [14]

Phylogeny after Wang et al., 2017 [14]

Phiomia serridens

Eritreum melakeghebrekristosi

Gomphotherium sp. (Mwiti)

Gomphotherium hannibali

Gomphotherium annectens

Gomphotherium cooperi

Gomphotherium sylvaticum

Gomphotherium libycum

Gomphotherium pygmaeus

Gomphotherium inopinatum

Gomphotherium mongoliense

Gomphotherium angustidens (s. s.)

Gomphotherium connexum

Gomphotherium subtapiroideum

Gomphotherium tassyi

Gomphotherium wimani

Gomphotherium browni

Gomphotherium productum

Gomphotherium steinheimense

Outgroups
"G. annectens group"
"G. angustidens group"
"Derived Gomphotherium"

Cladogram of Elephantiformes after Li et al. 2023, showing a paraphyletic Gomphotheriidae and Gomphotherium. [16]

Elephantiformes

Phiomia

Elephantimorpha

Mammutidae (mastodons)

Gomphotheres sensu lato

Eritreum

Gomphotherium annectens

Choerolophodontidae

Amebelodontidae (shovel tuskers)

"Gomphotheriidae"

Gomphotherium angustidens

Gomphotherium steinheimense

Tetralophodon + Elephantidae

Gomphotherium sylvaticum

Gomphotherium inopinatum

Gomphotherium browni

Gomphotherium tassyi

Gomphotherium productum + American gomphotheres

References

  1. Wang, Wei; Liao, Wei; Li, Dawei; Tian, Feng (1 July 2014). "Early Pleistocene large-mammal fauna associated with Gigantopithecus at Mohui Cave, Bubing Basin, South China". Quaternary International. 354: 122–130. Bibcode:2014QuInt.354..122W. doi:10.1016/j.quaint.2014.06.036. ISSN   1040-6182.
  2. Palmer, T. S.; Merriam, C. H. (1904). Index generum mammalium: a list of the genera and families of mammals. Government Printing Office, Washington.
  3. 1 2 3 Wu, Yan; Deng, Tao; Hu, Yaowu; Ma, Jiao; Zhou, Xinying; Mao, Limi; Zhang, Hanwen; Ye, Jie; Wang, Shi-Qi (16 May 2018). "A grazing Gomphotherium in Middle Miocene Central Asia, 10 million years prior to the origin of the Elephantidae". Scientific Reports . 8 (1): 7640. Bibcode:2018NatSR...8.7640W. doi:10.1038/s41598-018-25909-4. ISSN   2045-2322. PMC   5956065 . PMID   29769581.
  4. Baleka, Sina; Varela, Luciano; Tambusso, P. Sebastián; Paijmans, Johanna L.A.; Mothé, Dimila; Stafford, Thomas W.; Fariña, Richard A.; Hofreiter, Michael (January 2022). "Revisiting proboscidean phylogeny and evolution through total evidence and palaeogenetic analyses including Notiomastodon ancient DNA". iScience. 25 (1): 103559. Bibcode:2022iSci...25j3559B. doi:10.1016/j.isci.2021.103559. PMC   8693454 . PMID   34988402.
  5. Larramendi, A. (2016). "Shoulder height, body mass and shape of proboscideans" (PDF). Acta Palaeontologica Polonica . 61. doi: 10.4202/app.00136.2014 . S2CID   2092950.
  6. Mothé, Dimila; Ferretti, Marco P.; Avilla, Leonardo S. (12 January 2016). Beatty, Brian Lee (ed.). "The Dance of Tusks: Rediscovery of Lower Incisors in the Pan-American Proboscidean Cuvieronius hyodon Revises Incisor Evolution in Elephantimorpha". PLOS ONE. 11 (1): e0147009. Bibcode:2016PLoSO..1147009M. doi: 10.1371/journal.pone.0147009 . ISSN   1932-6203. PMC   4710528 . PMID   26756209.
  7. Sanders, William J. (7 July 2023). Evolution and Fossil Record of African Proboscidea (1 ed.). Boca Raton: CRC Press. p. 94. doi:10.1201/b20016. ISBN   978-1-315-11891-8.
  8. Fox, David L.; Fisher, Daniel C. (1 June 2001). "Stable Isotope Ecology of a Late Miocene Population of Gomphotherium productus (Mammalia, Proboscidea) from Port of Entry Pit, Oklahoma, USA" . PALAIOS . 16 (3): 279–293. Bibcode:2001Palai..16..279F. doi:10.1669/0883-1351(2001)016<0279:SIEOAL>2.0.CO;2. ISSN   0883-1351 . Retrieved 2 July 2024 via BioOne.
  9. Wang, Shi-Qi; Li, Yu; Duangkrayom, Jaroon; Yang, Xiang-Wen; He, Wen; Chen, Shan-Qin (4 May 2017). "A new species of Gomphotherium (Proboscidea, Mammalia) from China and the evolution of Gomphotherium in Eurasia" . Journal of Vertebrate Paleontology. 37 (3): e1318284. Bibcode:2017JVPal..37E8284W. doi:10.1080/02724634.2017.1318284. ISSN   0272-4634. S2CID   90593535.
  10. 1 2 Li, Chunxiao; Wang, Shi-Qi; Yang, Qing (26 May 2022). "Discovery of a primitive Gomphotherium from the Early Miocene of northern China and its biochronology and palaeobiogeography significance" . Historical Biology: 1–9. doi:10.1080/08912963.2022.2077106. ISSN   0891-2963. S2CID   249145789.
  11. 1 2 MacFadden, Bruce J.; Morgan, Gary S.; Jones, Douglas S.; Rincon, Aldo F. (March 2015). "Gomphothere proboscidean ( Gomphotherium ) from the late Neogene of Panama". Journal of Paleontology. 89 (2): 360–365. Bibcode:2015JPal...89..360M. doi: 10.1017/jpa.2014.31 . ISSN   0022-3360. S2CID   52093950.
  12. Spencer LG 2022. The last North American gomphotheres. N Mex Mus Nat Hist Sci. 88:45–58.
  13. 1 2 Wang, Shi-Qi; Ji, Xue-Ping; Jablonski, Nina G.; Su, Denise F.; Ge, Jun-Yi; Ding, Chang-Fen; Yu, Teng-Song; Li, Wen-Qi; Duangkrayom, Jaroon (June 2016). "The Oldest Cranium of Sinomastodon (Proboscidea, Gomphotheriidae), Discovered in the Uppermost Miocene of Southwestern China: Implications for the Origin and Migration of This Taxon" . Journal of Mammalian Evolution. 23 (2): 155–173. doi:10.1007/s10914-015-9311-z. ISSN   1064-7554. S2CID   254702519.
  14. 1 2 Wang, Shi-Qi; Li, Yu; Duangkrayom, Jaroon; Yang, Xiang-Wen; He, Wen; Chen, Shan-Qin (4 May 2017). "A new species of Gomphotherium (Proboscidea, Mammalia) from China and the evolution of Gomphotherium in Eurasia" . Journal of Vertebrate Paleontology. 37 (3): e1318284. Bibcode:2017JVPal..37E8284W. doi:10.1080/02724634.2017.1318284. ISSN   0272-4634. S2CID   90593535.
  15. Göhlich, Ursula B. (2010). "The Proboscidea (Mammalia) from the Miocene of Sandelzhausen (southern Germany)". Paläontologische Zeitschrift. 84 (1): 163–204. Bibcode:2010PalZ...84..163G. doi:10.1007/s12542-010-0053-1.
  16. Li, Chunxiao; Deng, Tao; Wang, Yang; Sun, Fajun; Wolff, Burt; Jiangzuo, Qigao; Ma, Jiao; Xing, Luda; Fu, Jiao (28 November 2023), "Longer mandible or nose? Co-evolution of feeding organs in early elephantiforms", eLife, 12, doi: 10.7554/eLife.90908.1 , retrieved 29 May 2024