Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 53. (Budapest 1961)
M. Nyírő, R.: A new foraminifer species from the Oligocene layers of Törökbálint
A New Foraminifer Species from the Oligocène Layers of Törökbálint By M. R. NYIRÖ, Budapest When examining the Formainifera of the tertiary layers near and around Törökbálint (in the vicinity of Budapest), I found a new species. Several specimens of both the microsphaeric and macrosphaeric forms were present. The description of the new species is as follows : Farn. LAGENIDAE Gen. Amphicoryne Schlumberger 1881 Amphicoryiie marginuliniformis no v. sp. (Figs. 1-2) A. macrosphaeric form : Holotype: One specimen in the Paleontological Department of the Hungarian Natural History Museum ; inventory number : M 60/580. Measurements of holotype: 0,52 mm long, greatest width : 0,24 mm. Iiocus typicus: Törökbálint, Com. Pest. A road cut under the vineyard called "Világos". Stratum typicum: Oligocène, Chattian formation. Derivatio nominis: The initial chambers of the new species resemble the structure of the tests of the genus Marginulina. Diagnosis: The test-wall is calcareous, thin, of a glassy appearance. The test consists of six chambers, divided into two parts. The lower or initial form are composed of flat, elongated chambers, four of which show a Marginulid conformation, while the fifth is more swollen and slightly ribbed. The initial chamber is elongated, rather large, of a guttiform shape, followed by the flat chambers. The sixth, therefore the youngest chamber is sphaerical, strongly ribbed, some ribs ending in a thorn. The aperture is a long, elongated tube, situated on the top of the last chamber, flanked by collar-like keels. At the initial, Marginulina-like part of the test, the chambers terminate in a thin edge, the initial chamber itself in a flat, thorn-like appendage. The septae of the test form thin ribs on the surface of the test. 1 2 Figs. 1—2. Amphicoryne marginuliniformis nov. sp. — Macrosphaeric form, holotype (1) •— Microsphaeric form, morphotype (2).
