MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 63
Description. - Test much elongated, narrowly oval, tapering at both
ends, triangular in cross-section, periphery acute; chambers narrow, flat,
slightly arcuate, middle chamber narrow and elongated, with a prominent
edge, fifth chamber hardly visible; sutures flat, distinct; wall thin; surface
c:;mooth, polished; aperture small, oval, with a simple narrow tooth.
Variability. The strongly elongated test and triangular cross-section
are constant features of the species. The edge of the middle chamber is
projecting to a various degree.
Dimorphism and ontogeny. The sections show the micro generation;
PD 20 !! (Text-fig. 22). No massiline forms have been found. In the
E
§
Fig. 22. Internal structure of QuinqueZoculina spondiungeriana (Serova), Upper Tortonian,
WE:glinek, micro generation; a front view, b apertural view, c cross-section.
juvenile stage 2-3 tubular chambers are visible, whereas all the later
chambers are uniform in shape, triangular in cross-section, with angular
edges.
Remarks. - The specimens studied are identical with Q. spondiungeriana
(Serova), the only difference being the less prominent edge of
their middle chamber. They differ from Q. venusta Karrer in having
an oval, not circular, aperture, a shorter tooth and less acute chamber
edges. From Q. stelligera Schlumberger they differ in their oval aperture,
and in the lack of truncate edges.
Distribution. - Poland: Tortonian (Bogoria, Brzeznica, Grabki Duze,
Grabowiec, Gliwice Stare, Dwikozy, Niskowa, Rybnica, W~glin, Wieliczka).
Czechoslovakia: Lover Tortonian, 2idlochovice. USSR: Lower Sarmatian.
the southwestern border of the Russian Platform, West Ukraine.
x + Quinqueloculina triangularis d'Orbigny, 1846
(pl. VIII, Figs 4a-c, 5a-c, Pl. IX, Fig. la, b; Text-figs 23, 24)
1846. QuinquelocuZina triangularis d'Orbigny; A. d'Orbigny, p. 228, PI. 18, Figs 7-9.
1959. MilioZina podolica Didkovsky; V. 1. Didkovsky, p. 306, Text-figs 1-3.