Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 21. 2003. (Budapest, 2003)

4 OZSVÁRT, P Gyroidinoides koestlerin.sp. (Plate I: 8-9) Name — The specific name koestleri is in honour of ARTHUR KOESTLER, the Hungarian-born novelist, critic and philosopher. Holotype — Eötvös Loránd University, Collection of the Department of Palaeontology. No. OP-4467; OP4468. Type locality — The Csetény 61 borehole. Type strata —Figured specimens from Csetény 61, 272 meter (Padrag Marl Formation). Stratigraphical range in Hungary — Middle Eocene (Lutetian - Bartonian) to Upper Eocene (Priabonian) Dimensions — Diameter of the test 800 — 900 urn. Width of the test at widest point 800-900 u,m. Diagnosis — Test free, wall calcareous, finely perforate; high trochospiral, plano-convex in cross section, spiral side evolute and planar, umbilical side involute and strongly convex with narrow umbilicus; circular in outline; 6-8 chambers in final whorls, increasing gradually in; 80100 urn protuberances visible on spiral side elongate of test; aperture interiomarginal slit, extending from umbilical side to spiral side. Remarks — This form is somewhat similar to Gyroidinoides soldanii (D'ORBIGNY), but the elongate (80-100 u.m) protuberances on the spiral side quite unique. Acknowledgements — 1 would like to thank DR. Katalin HORVÁTH-KOLLÁNYI and the Hungarian Geological Institute for permission to study the core samples. Special thanks are due DR. Miklós MONOSTORI, head of the Department of Palaeontology, Eötvös Loránd University for the chance to study his samples from the Mátyás-hegy section. I also thank Kamilla SÓLYMOS, Eötvös Loránd University for performing the excellent SEM work. References LOEBLICH, A. R. & TAPPAN, H. (1988): Foraminiferal genera and their classification. — New York, 1: 970 pp.; 2: 212 pp. 87 pis. OZSVARTP. (2003). A magyarországi paleogén medence paleoóceanográfiája bentosz foraminiferák ökológiai vizsgálata alapján. — Unpubl. PhD thesis, Department of Palaeontology, University Eötvös Loránd, Budapest, 213 pp. Author's address: Hungarian Academy of Sciences — Natural History Museum, Research Group for Palaeontology Budapest, Múzeum krt. 14-16 Mail: 1431 Budapest, pf. 137 Hungary e-mail: ozsi@nhmus.hu