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Mammals from the Middle Jurassic Balabansai Formation of the Fergana Depression, Kyrgyzstan

2010; Taylor & Francis; Volume: 30; Issue: 3 Linguagem: Inglês

10.1080/02724631003758045

1937-2809

Thomas Martin, Alexander O. Averianov,

Bat Biology and Ecology Studies

ABSTRACT At least 10 (or more) mammal taxa have been identified from the Middle Jurassic (Callovian) Balabansai Formation in northern Fergana Depression, Kyrgyzstan, on the basis of mostly isolated and fragmentary teeth: docodontans cf. Simpsonodon spp., Paritatodon sp. [Paritatodon, gen. nov., is established for 'Shuotherium kermacki' Sigogneau-Russell, 1998 Rougier, G. W., Martinelli, A. G., Forasiepi, A. M. and Novacek, M. J. 2007b. New Jurassic mammals from Patagonia, Argentina: a reappraisal of Australosphenida morphology and interrelationships. American Museum Novitates, 3566: 1–54. [Crossref], [Web of Science ®] , [Google Scholar], from the Bathonian of England], Tashkumyrodon desideratus, Tegotheriidae indet.; and Docodonta indet.; eutriconodontans Amphilestidae indet.; Ferganodon narynensis, cf. Ferganodon sp., and Triconodontidae indet.; 'symmetrodontan' Tinodontidae indet.; and cladotherians Paurodontidae indet. and Amphitheriidae indet. The occurrences of Triconodontidae, Tinodontidae, and Paurodontidae in the Balabansai Formation represent the oldest-known records of these groups. The Balabansai mammal assemblage is basically similar to the Bathonian mammals of the Forest Marble in England and the Itat mammal assemblage in Siberia respectively, revealing at present knowledge a marked uniformity of the Middle Jurassic mammal fauna across Laurasia.