Moeritherium

From Wikipedia, the free encyclopedia

Moeritherium
Fossil range: Late Eocene

Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Proboscidea
Family: Moeritheriidae
C.W. Andrews, 1906
Genus: Moeritherium
C.W. Andrews, 1901
Species
  • M. andrewsi Schlosser, 1911
  • M. chehbeurameuri Delmer et al., 2006
  • M. gracile Andrews, 1902
  • M. lyonsi Andrews, 1901
  • M. trigodon Andrews, 1904

Moeritherium ('the beast from Lake Moeris') is a genus consisting of several species. These prehistoric mammals are related to the elephant and, more distantly, the sea cow. They lived during the Eocene epoch.

The Moeritherium species were pig-like animals that lived about 37 million ybp. The Moeritherium resembled modern tapirs[1] or pygmy hippopotamuses. It was smaller than modern elephants, standing only 70 cm high at the shoulder and was about 3 m long. It is believed to have wallowed in swamps and rivers, filling the ecological niche now filled by the hippopotamus. The shape of its teeth suggest that it ate soft water vegetation.

The shape of the skull suggests that Moeritherium did not possess an elephant-like trunk, although it is possible that it had a broad and flexible upper lip for grasping aquatic vegetation. The incisor teeth formed small tusks, although these would have looked more like the teeth of a hippo than a modern elephant[2] [3].

Contents

[edit] Fossil remains

Skull of Moeritherium lyonsi in the Muséum National d'Histoire Naturelle, Paris, France.
Skull of Moeritherium lyonsi in the Muséum National d'Histoire Naturelle, Paris, France.
Moeritherium model.
Moeritherium model.

In 1901, Charles William Andrews described Moeritherium lyonsi from fossil remains found in the Qasr-el-Sagha formation in the Al Fayyum in Egypt. Andrews described Moeritherium gracile from fossil remains of a smaller specimen found in the same area in 1902 in a fluvio-marine formation,[4][5] that is a river estuary wetlands to brackish lagoon paleoenvironment. In 1904, the first Moeritherium trigodon fossils were discovered by Charles Andrews in the deposits of an oasis in Al Fayyum.[6][1] It is also found in other sites around North and West Africa [7]. In 1911, Max Schlosser of Munich divided Moeritherium lyonsi into two species: Moeritherium lyonsi, a large form from the Qasr-el-Sagha formation, and a new large species M. andrewsi from a fluvio-marine formation. [4][5][8] In 2006, Moeritherium chehbeurameuri has been described from fossil remains found in the early late Eocene locality of Bir El Ater, Algeria. [9]

[edit] Extinct branch

Moeritherium is not believed to be an ancestor of modern elephants; it was a branch of the order that died out, leaving no descendants. There were several species of early elephants in existence during the Eocene, and some, such as Palaeomastodon, looked relatively similar to modern elephants. However, Moeritherium typified a branch of the family that evolved in a quite different way, having only a stubby trunk and short legs.

[edit] In popular culture

[edit] References

  1. ^ a b Koehl, D. 2006. The genus Moeritherium, ancestor of elephants. Downloaded on 6 December 2006.
  2. ^ (1999) in Palmer, D.: The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions, 238. ISBN 1-84028-152-9. 
  3. ^ Savage, RJG, & Long, MR (1986). Mammal Evolution: an illustrated guide. New York: Facts on File, 147. ISBN 0-8160-1194-X. 
  4. ^ a b Matsumoto, H. 1922. Revision of Palæomastodon and Mœritherium. Palæomastodon intermedius, and Phiomia osborni, new species. American Museum Novitates. Number 51, November 21.
  5. ^ a b Matsumoto, H. 1923. A Contribution to the Knowledge of Mœritherium. Bulletin of the American Museum of Natural History ; v. 48, article 4. p. 97-140.
  6. ^ ABC Online. 2002. ABC - Science - Beasts - Moeritherium Factfile Downloaded on 6 December 2006.
  7. ^ BBC Homepage. 2006. - Science & Nature - Wildfacts - Moeritherium Downloaded on 6 December 2006.
  8. ^ Schlosser Max (1911) "Beiträge zur Kenntnis der oligozänen Landsäugetiere aus dem Fayum, Ägypten." Beiträge zur Paläontologie und Geologie Österreich-Ungarns, 24: 1–167.
  9. ^ Delmer, C., Mahboubi, M., Tabuce, R. & Tassy, P. 2006. "A new species of Moeritherium (Proboscidae, Mammalia) from the Eocene of Algeria: new perspectives on the ancestral morphotype of the genus." Palaeontology 49 (2), 421-434.