MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 61
Variability and ontogeny. The remarkable feature of the species is the
regular shape of the test. On the contrary, the tooth is variable in shape
and may be partially or completely reduced. The sections show the micro
generation. PD: 10-30 f! (Text-fig. 21/3,4).
Fig. 21. Internal structure of Quinqueloculina pygmaea Reuss and Quinqueloculina
regularis Reuss, Lower Tortonian, Wieliczka; 1,2 - Q. regularis, micro generation;
3,4 - Q. pygmaea, micro generation; a front view, b apertural view, c cross-section.
Remarks. - This species differs from Quinqueloculina regularis Reuss
in the narrowly oval, strongly elongated shape of its test, narrower
chambers and smaller dimensions, but it does not differ morphologically
from Quinquinella hornibrooki Vella, 1957, which has even light stripes
along the chamber edges. The only difference is its poorly developed
tooth in the shape of a transverse tape, whereas the tooth of Q. hornibrooki
has the shape of a semicircular plate. The aperture in Q. pygmaea corresponds
rather to that in the genus Varidentella than in the genus
Quinqueloculina, despite its typical quinqueloculine internal structure,
and it is undoubtedly transitional between these two genera.
Distribution. - Poland: Tortonian (Benczyn, Budy, Gliwice Stare, Krywald,
Ligota Zabrska, Wieliczka, Zrecze). Austria: Tortonian, the vicinity
of Baden, Vienna Basin.
X Quinqueloculina regularis Reuss, 1850
(PI. XXVII, Fig. la-e; Text-fig. 21/1, 2)
1850. Quinqueloeulina regularis Reuss; A. E. Reuss, p. 384, PI. 50, Fig. la-c.
1960. Quinqueloeulina akneriana d'Orbigny; N. N. Subbotina et al., p. 28, Pi. 1,
Fig. la-c.