MILIOLIDAE - Acta Palaeontologica Polonica

60 EWA LUCZKOWSKA
thickness 0.4-0.9 mm; MS length 2.2-2.4 mm, breadth 1.6-1.9 mm,
thickness 0.8-0.9 mm.
Description. - Quinqueloculine stage oval, triangular in cross-section,
periphery subacute; chambers slightly inflated, middle chamber with
slightly prominent edge, fifth chamber hardly visible as a narrow band:
massiline stage broadly oval, somewhat depressed, lenticular in crosssection,
periphery subacute; chambers broad, slightly inflated, middle
chamber small, oval, tapering at both ends, a little convex, with somewhat
prominent edge, fifth chamber narrow, distinct; sutures flat, hardly
visible; wall thick, surface smooth, polished; aperture large, oval, surrounded
with thickened rim, with long simple bifid tooth.
Variability. The periphery of quinqueloculine forms may be more or
less acute and the walls may be quite flat.
Dimorphism. The large massiline forms and quinqueloculine forms
belong to the microspheric generation and the small quinqueloculine forms
to the microspheric and megalospheric II generations (Text-fig. 20).
Proloculus diameters: microspheric - 10-20~, megalospheric II­
150-230 fL The megalospheric I generation has not been found; the
massiline forms are rare.
Remarks. - In general appearance this form resembles two species:
Quinqueloculina buchiana d'Orbigny and Q. lentica sp.n.. From the first
one it differs in having a more compact and thicker test and in lacking
a sharp and keeled periphery. From the second one it differs in its
elongated, not circular, shape and in more flattened walls. From Q. parakneriana
sp.n. it is distinguished by the broader oval test and subacute,
not rounded, periphery.
Distribution. - Poland: Lower Tortonian (Benczyn, Choment6w, Grabki
Duze, Karsy, Korytnica, L~ki Dolne, Niechobrz). Czechoslovakia: Lower
Tortonian, Zidlochovice.
X Quinqueloculina pygmaea Reuss, 1850
(PI. XXVII, Fig. 2a-c; Text-fig. 21/3, 4)
1850. Quinqueloculina pygmaea Reuss; A. E. Reuss, p. 384, PI. 50, Fig. 3.
1970. Quinqueloculina pygmaea Reuss; D. Verhoeve, p. 28, PI. 1, Fig. 10.
Material. - 30 QS (ColI. No. F-112, Sec. No. 379-381).
Dimensions: L 0.32-0.39; B 0.17-0.22; T 0.15-0.18.
Description. - Test narrowly oval, strongly elongated, regular, periphery
narrowly rounded, somewhat truncate; chambers narrow and
elongated, of uniform width, middle chambers narrow, slightly inflated;
sutures poorly depressed, indistinct; wall thin; surface smooth and polished,
with a light dull stripe along the edges of chambers; aperture very
small, semicircular, with a broad and low tape-shaped tooth, which is
occasionally lacking.