Since these estimates are based on the dimensions of the limb bones, but these differ proportionally from those of extant elephants, these values can only be considered as an approximation. For another individual, the weight calculations vary between 4.1 and 7.6 tons. A complete skeleton was reconstructed a height at the withers of about 2.5 meters and a body weight of 3.15 tons, while other analyzes put the weight of the same individual at more than 4.4 tons. Notiomastodon was a medium to large proboscidean. 6.2 Stegomastodon, Notiomastodon and Haplomastodon.3.2 Population structure and reproduction.Specimens have been found associated with human artifacts, suggesting that hunting by recently arrived humans may have played a role in the extinction. Notiomastodon became extinct approximately 11,000 years ago at the end of the Pleistocene epoch. Extensive anatomical studies since the 2010s have shown that Notiomastodon represents the only valid proboscidean in lowland South America, Haplomastodon is synonymous and Stegomastodon is limited to North America. The genus was originally named in 1929, and has been controversial in the course of taxonomic history as it has frequently been confused with or synonymized with forms called Haplomastodon and Stegomastodon. In the course of the last glacial period, there was an adaptation towards the consumption of grasses. Notiomastodon was a generalist feeder capable of consuming various types of plants, which varied according to local environments.
The short jaw was due to the loss of the lower tusks found in more primitive gomphotheres. Like other brevirostrine gomphotheres such as Cuvieronius and Stegomastodon, Notiomastodon was characterized by its short snout and tall, highly arched skull. Notiomastodon specimens reached a size similar to that of the modern Asian elephant. Notiomastodon is an extinct proboscidean genus of gomphotheres (a distant relative to modern elephants) endemic to South America from the Pleistocene to the beginning of the Holocene. Amahuacatherium peruvium Romero-Pittman, 1996.Haplomastodon guayasensis Hoffstetter, 1952.Mastodon bonaerensis Moreno, 1888 nomen nudum.
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