Loxodonta exoptata

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Loxodonta exoptata
Temporal range: Pliocene
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Proboscidea
Family: Elephantidae
Genus: Loxodonta
Species:
L. exoptata
Binomial name
Loxodonta exoptata
(Dietrich, 1941)

Loxodonta exoptata is an extinct species of elephant in the genus Loxodonta , from Africa. A 2009 study suggested that Loxodonta exoptata gave rise to L. atlantica , which gave rise to L. africana . [1] The molars of L. exoptata are distinguished from later loxodonts by the lower plate number and their specialized enamel loops. [2] Fossil remains of L. exoptata have been found at Pliocene sites in eastern Africa including Hadar, Laetoli and Koobi Fora. [2]

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Hadar or Hadar Formation is a paleontological fossil site located in Mille district, Administrative Zone 1 of the Afar Region, Ethiopia, 15 km upstream (west) of the A1 road's bridge across the Awash River.

<i>Mellivora</i> Genus of mammals

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<i>Primelephas</i> Extinct genus of mammals

Primelephas is a genus of Elephantinae that existed during the Miocene and Pliocene epochs. The name of the genus suggests 'first elephant'. These primitive elephantids are thought to be the common ancestor of Mammuthus, the mammoths, and the closely allied genera Elephas and Loxodonta, the Asian and African elephants, diverging some 4-6 million years ago. It had four tusks, which is a trait not shared with its descendants, but common in earlier proboscideans. The type species, Primelephas gomphotheroides, was described by Vincent Maglio in 1970, with the specific epithet indicating the fossil specimens were gomphothere-like. Primelephas korotorensis is the only other species to be assigned to the genus. All fossils found of the Primelephas have been found in Africa, primarily in modern day Chad, Tanzania, Kenya, Ethiopia, and Uganda.

<span class="mw-page-title-main">African bush elephant</span> Species of mammal

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Loxodonta adaurora is an extinct species of elephant in the genus Loxodonta, that of the African elephants. Fossils of Loxodonta adaurora have only been found in Africa, where they developed in the Pliocene. L. adaurora was presumed to be the genetic antecedent of the two modern African elephant species; however, an analysis in 2009 suggested that L. africana evolved from L. atlantica. The same study concluded that Loxodonta adaurora was morphologically indistinguishable from Mammuthus subplanifrons and that these constituted the same species probably within the mammoth lineage. However, other authors have continued to consider L. adaurora a valid species of Loxodonta, with some considering it an early morph of Loxodonta exoptata.

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<span class="mw-page-title-main">Jon Kalb</span>

Jon Kalb August 17, 1941 - October 27, 2017 was a research geologist with the Vertebrate Paleontology Laboratory, University of Texas at Austin. He received a pre-doctoral fellowship from the Carnegie Geophysical Laboratory in 1968, a graduate fellowship from Johns Hopkins University in 1969, and a BSc from American University in 1970.

<i>Loxodonta atlantica</i> Extinct species of mammal

Loxodonta atlantica is an extinct African species of elephant in the genus Loxodonta. It was larger than modern African elephants, with more progressive dentition. It includes Pleistocene fossils from Ternifine, Algeria, Middle Pleistocene fossils from Elandsfontein, South Africa and Late Pliocene fossils from the Omo River, Ethiopia. It is suggested to have an extinction date of around 400,000 years ago, during the Middle Pleistocene. L. atlantica has been suggested to have probably derived from L. adaurora; or L. exoptata. It is likely ancestral to the living African bush elephant, L. africana, with which it coexisted during the Middle Pleistocene prior to its extinction. The species is divided into two subspecies: L. atlantica atlantica and L. atlantica zulu. The type for Loxodonta atlantica is housed in the Muséum national d'histoire naturelle in Paris, but is listed without a specimen number.

Pliopapio is an extinct genus of Old World monkey known from the latest part of the Miocene to the early Pliocene Epochs from the Afar Region of Ethiopia. It was first described based on a very large series of fossils from the site of Aramis in the Middle Awash, which has been dated by 40Ar/39Ar to 4.4 million years old. It has since been found from similarly aged sediments at Gona, approximately 75 km to the North. Additional fossils from the Middle Awash extend its known time range back to at least 5.3 million years ago. There is only one known species, Pliopapio alemui.

References

  1. The Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology Volume 293, Issue 1, Article first published online: 20 November 2009: http://onlinelibrary.wiley.com/doi/10.1002/ar.21010/pdf, retrieved 2 December 2011.
  2. 1 2 Jon E. Kalb, Assefa Mebrate (1993). Fossil elephantoids from the hominid-bearing Awash Group, Middle Awash Valley, Afar Depression, Ethiopia.