MILIOLIDAE - Acta Palaeontologica Polonica

144 EWA l.UCZKOWSKA
Variability. The border of the aperture may be more or less everted,
the shape of tooth varies from broad tape to narrow ridge or may be
reduced, leaving only small traces (Text-fig. 50).
Dimorphism and ontogeny. The sections show the mega I (?) generation;
PD 60--80 fl. The internal structure is cryptoquinqueloculine (Text-fig. 50);
there is a turn in the coiling axis by about 90° after the juvenile stage.
lmm
Fig. 50. Morphology and internal structure of VaridenteUa rosen (d'Orbigny), Lower
Sarmatian, Budy-l borehole, depth 190.8-190.9 m, mega I generation; I-large
specimen with qUinqueloculine chamber arrangement; 2 - irregularly cryptoquinqueloculine
chamber arrangement; 3, 4 - small specimens with turn of coiling axis
visible in juvenile stage; a front view, b apertural view, c cross-section.
Remarks. - This species differs from Cycloforina stomata sp.n. in
its more circular shape, more inflated chambers, depressed sutures,
semicircular, large aperture and small, tape-like tooth, from Varidentella
rotunda (Gerke) in much more inflated chambers and depressed sutures
and from Sinuloculina rotunda (d'Orbigny) in having a more circular test,
more inflated chambers and broad semicircular aperture with a tape-like
tooth.
Distribution. - Poland: Lower Sarmatian, (Budy, Dwikozy, Grzyb6w,
Mielec, Rytwiany, Wierzchowiska, Zrecze). Cuba: Recent.