EARLY EOCENE OSTRACODA FROM THE AKLI FORMATION OF BARMER BASIN, RAJASTHAN

摘要

Twenty-two ostracod species from the Akli Formation of Barmer Basin, Rajasthan are recorded and/or described for the first time. Two species - Stigmatocythere barmerensis and S. shivkarensis - are new. Nineteen species - Aglaiocypris kutchensis (Guha), Paracypris siddiquii Bhandari, Phlyctenophora jhingrani (Singh and Tewari), Neocyprideis bhupendri (Singh and Misra), Cytheropteron rameshi (Singh and Misra), Paijenborchellina indica (Khosla), Neomonoceratina paraoertlii Khosla and Nagori, Schizocythere bikanerensis Singh and Misra, Actinocythereis valdiyai (Singh and Misra), Alocopocythere abstracta Siddiqui, A. longilinea Siddiqui, A. transcendens Siddiqui, Gyrocythere memorans (Lubimova and Guha), G. parvicarinata Siddiqui, Occultocythereis peristicta Siddiqui, Xestoleberis sp. cf. X. muelleriana Lienenklaus, Cytherella harudiensis Khosla and Pant, C. tawaica Singh and Tewari, and Cytherelloidea guhai Khosla - are assigned to previously known species. One species Paracytheridea sp. - is left in open nomenclature. Age and palaeoecology of the ostracod fauna are also discussed. The fauna is characteristic of Early Eocene in age and the beds of Akli Formation were deposited in near shore to lagoon environments.