MILIOLIDAE - Acta Palaeontologica Polonica

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58 EWA l.UCZKOWSKA Description. - QS oval or narrowly oval, trapezoid in cross-section, periphery acute; chambers flat, narrow, arcuate, middle chamber oval, flat, tapering at both ends, fifth chamber appears as a narrow ridge; MS much flattened, broadly oval, periphery acute; chambers broad, flat, arcuate, two middle chambers are usually seen on both sides of the test; in adult specimens the narrow, prominent ridge of the third chamber is besides visible between them; sutures flat, distinct; surface smooth, polished; wall thin; aperture oval, with flexuose margins and thickened rim, and with a long bifid tooth. Variability. The test shape and the degree of test flattening are variable. Quinqueloculine forms are narrowly oval and elongated, becoming more rounded and flattened as massiline chambers increase in number. Dimorphism. Massiline forms are of the mega I and micro generations (Text-fig. 15/1, 2). Quinqueloculine forms represent only the mega I generation (Text-fig. 15/3). The differentiation of generations is not marked in morphology. PD: micro - 20 Il, mega I - 60-120 fl. Quinqueloculine forms are abundant and massiline forms rare. Remarks. - This species differs from Quinqueloculina haidingeri d'Orbigny in having a more elongate shape, more flattened test, a more acute periphery and thinner walls. From Q. dichotoma (Reuss) it differs in its smooth, not striated surface. The shape of both these species is almost identical, being however more flattened in Q. peregrina. Distribution. - Poland: Lower Tortonian (Grabki Duze, Karsy, Korytnica). Austria: Lower Tortonian, the vicinity of Baden, Vienna Basin. Czechoslovakia: Lower Tortonian, Zidlochovice, Devinska Nova Ves. Italy: Miocene, Siena and Toscania region. Quinqueloculina pseudobuchiana sp.n. (PI. IV, Fig. 5a-c, PI. V, Figs la, b; 2a, b; Text-fig. 20) 1952. Miliolina ungeriana (d'Orbigny); A. K. Bogdanowich, p. 110, PI. 10, Fig. 3a-c (non 2a, b). Ho!otypus: PI. V, Fig. 2a, b. Paratypi: PI. IV, Fig. 5a-c, PI. V, Fig. la, b. Locus typicus: Korytnica near JE:drzej6w. Stratum typicum: Lower Tortonian (Badenian), gray clay marls. Derivatio nominis: pseudobuchiana - false Q. buchiana. Diagnosis. - Test broadly oval, chambers slightly inflated, periphery subacute, not keeled, middle chamber with slightly prominent edge, fifth chamber poorly visible. Material. - About 120 QS and about 50 MS (ColI. No. F-111, Sec. No. 97-101, 227-231, 256, 269-272, 354, 355). Dimensions: Holotype MS - length 2.0 mm, breadth 1.5 mm, thickness 0.75 mm; Paratypes QS - length 0.7-2.2 mm, breadth 0.6-1.6 mm,
I lmm ! Sa @a ~ ~b~5b~b ~ ~4d~ ~~c~c Fig. 20. Ontogeny and dimorphism of Quinqueloculina pseudobuchiana sp. n., Lower Tortonian, Korytnica; 1-MS of quinqueloculine appearance, micro generation; 2,4 - QS, micro generation; 3,5,6 - QS, mega II generation; a front view, b apertural view, c cross-section.
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MILIOLIDAE - Acta Palaeontologica Polonica

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