MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 49
Q. buchiana QS resembles three Recent species, described by d'Orbigny
(1839) from Cuba: Q. lamarckiana, Q. cuvieriana and Q. auberiana; Since
in the descriptions of Q. buchiana and Q. ungeriana from 1846 he did not
mention the resemblance of these species to those described earlier from
Cuba, he apparently considered them to be individual species. In the light
of the descriptions of the species from Cuba, each of them is somewhat
different from Q. buchiana in the shape of the aperture and test periphery.
Distribution. - Poland: Tortonian (Brzeznica, Benczyn, Choment6w,
Gliwice Stare, Grabki Duze, Iwkowa, L~ki Dolne, Karsy, Korytnica).
Austria: Tortonian, the vicinity of Nussdorf and Baden, the Vienna Basin.
Bulgaria: Tortonian, northwestern region of Bulgaria. Czechoslovakia:
Tortonian, 2idlochovice and Devinska Nova Ves. USSR: Tchokrak (Middle
Miocene), North Caucasian and Crimea; Upper Tortonian, West Ukraine.
Quinqueloculina dichotoma (Reuss, 1850)
(pI. II, Fig. 3a-c; PI. III, Figs la, b, 2a, b; Text-fig. 15/4-7)
1850. Triloculina dichotoma Reuss; A. E. Reuss, p. 383, Pl. 49, Fig. 12a-c.
Material. - About 100 QS and about 80 MS (CoIl. No. F-106, Sec. No.
111-115, 233-235).
Dimensions: QS - L 0.75-1.45; B 0.45-1.10; T 0.3-0.5; MS - L 1.6­
1.8; B 1.25-1.45; T 0.5-0.7.
Description. - QS broadly oval, resembling Quinqueloculina peregrina
d'Orbigny; surface smooth, polished, covered entirely or at least in the
vicinity of edges and at the bottom of chambers with very tiny, longitudinal
striae of various length, densely and irregularly distributed; the striae
are well marked near the edges of chambers.
Variability. The number of striae and their distinctness are variable.
There are intermediate forms between Q. peregrina and Q. dichotoma.
Dimorphism. Massiline forms, few in number, are the micro and mega I
generations (Text-fig. 15/4, 5); much more frequent quinqueloculine forms
belong only to the mega I generation (Text-fig. 15/6, 7). PD: micro - 20f!,
mega 1- 100-120t!. The differentiation of generations is not marked in
morphology.
Remarks. - This species differs from Quinqueloculina peregrina in
having a somewhat thicker test and in its striate surface, but the two
species are undoubtedly related to each other. Similar finely striated forms
occur in the Recent deposits of the Adriatic Sea, but they have a more
elongated shape.
Distribution. - Poland: Lower Tortonian (Grabki Duze, Karsy, Korytnica).
Austria: Tortonian, the vicinity of Baden, Vienna Basin. Czechoslovakia:
Lower Tortonian, 2idlochovice and Devinska Nova Ves.
4 Acta Palaeontologica nr 1/74