MILIOLIDAE - Acta Palaeontologica Polonica

126 EWA LUCZKOWSKA
Dimorphism and ontogeny. The sections show the micro generation
with the proculus 30 ~ in diameter and the mega I ? generation with the
proculus 120-150 f1 in diameter. The internal structure, initially cryptoquinqueloculine,
then triloculine, becomes finally irregular biloculine,
with chambers situated opposite each other and embracing the preceding
ones in such a way that they form a sinusoid line in cross-section (Textfig.
41). All chambers have a similar semicircular cross-section in the
course of ontogeny.
Remarks. - This species differs from Sinuloculina inflata (d'Orbigny)
in its nearly circular test shape, more inflated broad chambers and
characteristic large aperture with a thickened rim. It is very similar to
S. pyrula (Karrer) from Lapugiu and S. decipiens (Reuss) from Grinzing,
which are probably synonyms. A comparison of our specimens with the
tbpotypes of S. pyrula from Lapugiu and Buitur and with S. decipiens
from Voslau shows that they differ in their more elongated test, more
inflated chambers, flat and broad sutures, and large aperture with
a thickened rim. The juvenile specimens are somewhat similar to S. pyrula,
but adults differ conspicuously in their tendency to the biloculine chamber
arrangement and the lateral compression of the test. In comparison with
the description of S. cyclostoma (Reuss) our forms have a thicker tooth,
but a short and thin tooth, like that figured by Reuss, occurs both in
single specimens of our forms and in some comparative specimens
of S. cyclostoma from Buitur.
Distribution. - Poland: Upper Tortonian (Gieraszowice, Grabowiec,
Korytnica, Ligota Zabrska, Niskowa, W~glinek). Austria: Tortonian,
vicinity of Vienna (Grinzing). Romania: Tortonian, Buitur. USSR: Middle
Miocene, West Ukraine, Transcarpathians. Recent: Mediterranean Sea.
+ X Sinuloculina inflata (d'Orbigny, 1826)
(PI. XXIV, Fig. 6a-c)
1826. Triloculina inflata d'Orbigny; A. d'Orbigny, p. 300, in Catalogue Ellis & Messina.
1846. Triloculina inflata d'Orbigny; A. d'Orbigny. p. 278, PI. 17, Figs 13-15.
1970. Triloculina inflata inflata d'Orbigny; V. J. Didkovsky & Z. N. Satanovskaja,
p. 57, PI. 34, Fig. 4, cum syn.
Material. - 12 specimens (ColI. No. F-162).
Dimensions: L 0.7-1.3; B 0.4-0.7; T 0.3-0.5.
Description. - Test elongate, quadrangular-oval, cross-section circularoval,
periphery broadly rounded; chambers broad, tubular, more inflated
and curved at the base and straightened at the end; two or three chambers
visible from outside; surface smooth, polished; aperture circular, large
with a robust tooth bifid at the end.
Variability. The lower part of chambers may be more or less inflated.