Microtitan

Microtitan
Temporal range: Middle Eocene (Irdinmanhan[1][2]), 47.8–42.7 Ma
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Placentalia
Order: Perissodactyla
Family: †Brontotheriidae
Genus: †Microtitan
Species:
†M. mongoliensis
Binomial name
†Microtitan mongoliensis
Granger and Gregory, 1943

Microtitan is a genus of brontothere from the Irdin Manha formation.[3]

Description

Microtitan is small compared to other contemporary brontotheres, being similar in size to Metarhinus. The premolars of Microtitan are compressed, while the molars are elongated.[4] The genus is almost entirely known from the cheek teeth, as well as mandibular and maxillary remains.[5][6] There is no indication of the specialization of the rostrum as seen in Dolichorhinus or Metarhinus. The upper canines of Microtitan are moderately sized.[1]

Classification

The fragmentary nature of Microtitan has caused it to have a convoluted classification history. The holotype specimen of the genus, AMNH 20167, (ascribed to the species M. mongoliensis) has been considered a composite specimen (meaning material came from multiple individuals) and not fitting to be a diagnostic specimen. A neotype, AMNH 22099, is currently ascribed to the species by Granger and Gregory (1943).[4][1] Other species assigned to the genus have been considered dubious.[1][5]

Currently the genus is grouped within the subfamily Brontotheriinae, close to Metarhinus.[1]

References

  1. ^ a b c d e Mihlbachler, Matthew C. "Species Taxonomy, Phylogeny, and Biogeography of the Brontotheriidae (Mammalia: Perissodactyla)". Bulletin of the American Museum of Natural History. doi:10.1206/0003-0090(2008)501[1:STPABO]2.0.CO;2.full.
  2. ^ Bai, Bin; Meng, Jin; Janis, Christine M.; Zhang, Zhao‐Qun; Wang, Yuan‐Qing (2020). "Perissodactyl diversities and responses to climate changes as reflected by dental homogeneity during the Cenozoic in Asia". Ecology and Evolution. 10 (13): 6333–6355. doi:10.1002/ece3.6363. ISSN 2045-7758. PMC 7381588. PMID 32724516.
  3. ^ "Mindat.org". www.mindat.org. Retrieved 2025-12-17.
  4. ^ a b Granger, Walter; Gregory, William K. "A revision of the Mongolian titanotheres. Bulletin of the AMNH ; v. 80, article 10". Biodiversity Heritage Library. Retrieved 2025-12-17.
  5. ^ a b Bai, Bin; Wang, Yuan-Qing; Li, Qian; Wang, Hai-Bing; Mao, Fang-Yuan; Gong, Yan-Xin; Meng, Jin. "Biostratigraphy and Diversity of Paleogene Perissodactyls from the Erlian Basin of Inner Mongolia, China". American Museum Novitates. doi:10.1206/3914.1.full.
  6. ^ Mihlbachler, Matthew C.; Lucas, Spencer G.; Emry, Robert J.; Bayshashov, Bolat. "A New Brontothere (Brontotheriidae, Perissodactyla, Mammalia) from the Eocene of the Ily Basin of Kazakstan and a Phylogeny of Asian "Horned" Brontotheres". American Museum Novitates. doi:10.1206/0003-0082(2004)439%3C0001:ANBBPM%3E2.0.CO;2.full.

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