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Notiomastodon platensis
Notiomastodon platensis Notiomastodon platensis Notiomastodon platensis
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Notiomastodon platensis

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Notiomastodon (Notiomastodon platensis (Ameghino, 1888))


  • Stegomastodon platensis Ameghino 1888
  • Stegomastodon waringi Holland 1920
  • Haplomastodon waringi Holland 1920
  • Haplomastodon chimborazi Proaño 1922
  • Haplomastodon guayasensis Hoffstetter 1952


Order: Proboscidea


Dimensions: length - 4,25 - 4,5 m, height - 2 -2,5 m, weight - 3500 -4300 kg

Temporal range: during the Pleistocene - Holocene epoch of South America (~1.8–0.006 Ma )


Notiomastodon is an extinct proboscidean genus of gomphotheres (a distant relative to modern elephants) endemic to South America from the Pleistocene to the Holocene living for about 1.8 million years. N. platensis is known from MECN 82, a 35-year-old male that would be around 2.52 m  tall, with an estimated weight of 4.4 tonnes. It had two tusks (one on either side of its trunk), like other members of the Gomphotheriidae. Unlike close relative Cuvieronius, its tusks were not twisted, but their length and shape are observed as greatly variable depending on the individual.

Notiomastodon belongs to the family Gomphotheriidae, a group of animals distantly related to modern elephants and mammoths. Notiomastodon seems to have had a 4-million-year-long ghost lineage, diverging from the clade that contains Rhynchotherium and Cuvieronius around the Late Miocene. This would imply that Notiomastodon had been evolving in southern Central America, where the fossils are poorly sampled, prior to its migration into South America during the Pliocene or Pleistocene.

Notiomastodon has been described as the 'lowland gomphothere'.The genus tended to inhabit seasonally dry, open forests, with a range lining most of the South American coastline and lowland interior, bar the Guiana Shield, with particularly large concentrations along the coast of Peru and in northeastern Brazil. In contrast, the other representative of South American gomphotheres, Cuvieronius, inhabited the mountainous Andes region from Ecuador to southern Peru and Bolivia, as well as lowland areas in north-east Peru.

The diet composition of Notiomastodon varied widely depending on location, but probably primarily consisted of a mix of C3 shrubs and C4 grasses, whilst also serving as a primary disperser of the seeds for a variety of different plant species.

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