Revision of small Bunodont Anthracotheres (Artiodactyla, Anthracotheriidae, Microbunodontinae) from Indo-Pakistan, and Reassessment of the Age of the Caribari Deposits, Garo Hills, Bengal

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Revision of small Bunodont Anthracotheres (Artiodactyla, Anthracotheriidae, Microbunodontinae) from Indo-Pakistan, and Reassessment of the Age of the Caribari Deposits, Garo Hills, Bengal
A small species of bunodont anthracothere from the basal Late Miocene of Dhok Mila, Pakistan (Nagri Formation) was named Microbunodon milaensis Lihoreau, Blondel, Barry & Brunet, 2004. The hypodigm of the species included two specimens reported as being from unknown localities. Further investigation has elucidated the localities from which the two specimens came. One is from Caribari (Garo Hills, Bengal, India), the other is from Chur Lando (Bugti region, Pakistan). The catalogue number of the fossil from Caribari was reported to be NHMUK M 19442, but it is in fact NHMUK PV OR 19042. The tooth, a right m/3, is compatible in dimensions and morphology with NHMUK PV OR 19041, the lectotype right M3/ of Anthracotherium silistrense Pentland, 1828, on which basis it is inferred that the two bunodont teeth from Caribari belong to a single species. The Caribari m/3 was included among the fossils attributed by the authors to Microbunodon milaensis. As such, Mb. milaensis becomes a junior synonym of A. silistrense. This conclusion prompts a revision of the small bunodont anthracotheres from Indo-Pakistan, an understanding of which requires an overview of the small anthracotheres from the Eocene and Oligocene of Europe and Southeast Asia (Myanmar, Thailand). It is demonstrated that the genus Microbunodon Depéret, 1908, does not occur therein. A new genus is erected for the small bunodont anthracotheres from Indo-Pakistan in which there are three time successive size groups interpreted to represent distinct species. The senior name for the the largest species is Gen. nov. silistrensis, the medium-sized species is Gen. nov. punjabiensis (Lydekker, 1877a) and the smallest species is Gen. nov. exiguus (Forster-Cooper, 1924). Caribari also yielded the type specimen (NHMUK PV OR 19040) of the small selenodont anthracothere, Sivameryx palaeindicus (Lydekker, 1877b). The presence of Gen. nov. silistrensis and S. palaeindicus at Caribari indicates that the Bengali deposits are most likely to correlate to the late Middle Miocene to basal Late Miocene (ca 12-9.5 Ma), rather than to the Early Miocene as thought for the past two centuries. Key Words: Miocene, Indo-Pakistan, Anthracothere, Bunodont, Selenodont, taxonomy, phylogeny, biostratigraphy, biogeography

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ISBN: 9783899373134

Language: English

Publication date: 25.03.2026

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