MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 123
Remarks. - This species occurs rarely at Wieliczka and corresponds to
Reuss's illustration and description. It differs from Pyrgoella controversa
(Bogdanowich) in its more spherical test, broader aperture with a semicircular
flap-like, not oblong and tongue-like, tooth and in the considerably
thinner wall.
Distribution - Poland: Tortonian (Brzeznica, Gliwice Stare, Rybnica,
Wieliczka). Austria: Tortonian, vicinity of Vienna (Grinzing). Yugoslavia:
Tertiary, Serbia.
Genus Sinuloculina Luczkowska, 1972
+ X Sinuloculina consobrina (d'Orbigny, 1846)
(PI. XXV, Figs 5a-e, 6, 7a-e; Text-fig. 40)
1846. Triloeulina eonsobrina d'Orbigny; A. d'Orbigny, p. 277, PI. 17, Figs 10-12.
1952. Miliolina eonsobrina (d'Orbigny) var. nitens (Reuss); A. K. Bogdanowich, p. 125.
PI. 14, Figs. 2, 3.
1952. Miliolina eonsobrina (d'Orbigny) var. sarmatiea Gerke; ibidem, p. 126, PI. 14,
Fig.6a-e.
1955. Miliolina nitens (Reuss); M. J. Serova, p. 31, PI. 5, Figs 1-6.
1955. Triloeulina eonsobrina d'Orbigny; E. Luczkowska, p. 104, PI. 6, Fig. lOa-c.
1956. Triloculina eonsobrina d'Orbigny; A. Sulimski, p. 78, PI. 3, Fig. 1a-c; eum syn.
Material.-l00 specimens (ColI. No. F-I77, Sec. No. 175-177).
Dimensions: L 0.7-1.2; B 0.32-0.5; T 0.2-0.3.
Description. - Test narrowly oval, flattened, tapering at the top and
rounded at the base, periphery rounded; chambers narrow, broader at the
base and near the aperture, last chamber usually slightly protruded and
oblique at the top or extended to form a short narrow neck, middle
chamber large, narrow and long, slightly oblique, fifth chamber usually
invisible or marked as a poorly visible tape; 3-5 chambers visible from
outside; sutures flat, indistinct; wall thin; surface smooth, polished; aperture
small, circular, sometimes on a small extension of the last chamber,
and with a short and bifid tooth.
Variability. The test shape is distinctive and stable. The apertural end
is variable with a short neck or without it. The number of the chambers
visible from outside is also variable, usually three, but occasionally four
or five chambers being seen, as in Quinqueloculina.
Dimorphism and ontogeny. The sections show a variable internal
structure, quinqueloculine or cryptoquinqueloculine, like that in Sinuloculina
nitens (Reuss). The PD is 30 11, typical of the micro generation.
The shape of the chambers in cross-section does not change during the
ontogeny (Text-fig. 40) and is usually semicircular or triangular-semicircular.
Remarks. - This well-known species occurs commonly and fairly
abundantly. It was assigned to the genus Quinqueloculina or Triloculina,
according to the number of visible chambers; it was divided into a