Print ISSN: 0031-0247
Online ISSN: 2274-0333
Eocene otoliths (Clinchfield Formation), Georgia
Hypoplasia: CT-scan or naked eye?
New elephant cranium from early Pliocene Ileret, Kenya
Early adaptive radiation of Theridomorpha
Evolution et extinction des reptiles marins au Mésozoïque
First early Eocene tapiroid from India and its implication for the paleobiogeographic origin of perissodactyls
Thierry Smith, Floréal Solé, Pieter Missiaen, Rajendra Rana, Kishor Kumar, Ashok Sahni and Kenneth D. RoseKeywords: Ceratomorpha; Helaletidae; Paleogene; Tapiromorpha; Vastan
The presence of cambaytheres, the sister group of perissodactyls, in western India near or before the time of collision with Asia suggests that Perissodactyla may have originated on the Indian Plate during its final drift towards Asia. Herein we reinforce this hypothesis by reporting two teeth of the first early Eocene tapiromorph Perissodactyla from the Cambay Shale Formation of Vastan Lignite Mine (c. 54.5 Ma), Gujarat, western India, which we allocate to a new genus and species, Vastanolophus holbrooki. It presents plesiomorphic characters typical of the paraphyletic “Isectolophidae,” such as small size and weak lophodonty. However, the weaker hypoconulid and low paralophid, higher cusps, lower cristid obliqua, and the lingual opening of the talonid are found in Helaletidae, the most primitive tapiroid family. V. holbrooki, gen. et sp. nov., may be the oldest and the most primitive tapiroid, suggesting that at least tapiroid perissodactyls originated on India.
Published in Vol.39-2 (2015)