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Diagnosis : Unequally biconvex low trochospiral test, acute peripheral margin with thick perforate peripheral band, last chamber smaller than the penultimate one, sutures curved on ventral side, areal aperture on the ventral surface of the last chamber, surface coarsely perforated.
Description : Test medium, peripheral outline subcircular, weakly lobed, subtriangular in side view; dorsal side weakly convex, ventral strongly convex resembling asymmetric ʻvʼ with round apex ; peripheral margin acute with round tip; a thick perforate keel all along peripheral margin; spire tight comprising more than 2.5 whorls, early spire indistinct weakly raised, last whorl with four longer than high chambers markedly increasing till the penultimate one, last chamber smaller than the penultimate one; spiral suture in later part shallow ; septal sutures in last whorl radial nearly straight occurring almost at the level of chamber surface. In peripheral view the peripheral angle between dorsal and ventral sides is acute in the early part of the last whorl, gradually increasing with growth. On the ventral side early sutures indistinct, later sutures faint curved except for the basal suture of last chamber, which is nearly straight; sutures occurring almost at the level of the chamber surfaces; umbilicus closed. Aperture areal, an elongate opening on the ventral side of the last chamber in between its anterior part and the periphery, and oriented almost parallel to the basal suture, subelliptical in peripheral view, bordered by a raised perforated wall, subcircular in ventral view ; surface coarsely perforated ; sutures, peripheral margin and wall of the aperture with sparse coarse perforations ; pores vary in size and shape.
Etymology: After Kotardu nala, 1.5 km east of Dinod village in Surat Distri
Extra details from original publication
Distribution : Turborotalia kotarduensis is restricted to the Turborotalia kotarduensis Zone (P18 Zone to P19, Early Oligocene) in sl I & II.
Turborotalia kotarduensis compiled by the pforams@mikrotax project team viewed: 30-7-2021
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