MILIOLIDAE - Acta Palaeontologica Polonica

146 EWA LUCZKOWSKA
transparent; aperture large, semicircular, oblique and with a short, quadrate,
bifid tooth.
Variability. A characteristic feature of this species is its stable subcircular
shape, subtriangular in cross-section and a short, quadrangular tooth.
The convexity of the middle chamber is variable, as well as the apertural
extension which may be inclined towards the penultimate chamber in
some specimens (PI. XXVII, Fig. 6).
Dimorphism and ontogeny. The specimens sectioned belong to the
micro generation, PO 20 .J.l and mega I (?) generation, PO 50-60 t.t (Textfig.
51). The internal structure is quinqueloculine or cryptoquinqueloculine
,and there are 3, 4 or 5 chambers visible from outside. In the juvenile
stage of the mega I (?) generation there is a tendency for the coiling axis
to turn (Text-fig. 51/4).
Remarks. - This species closely resembles Varidentella pseudocostata
(Venglinsky), but differs in its smaller dimensions, more flattened sides of
chambers, narrowly rounded periphery and lack of ornamentation. There
is however no resemblance to Quinqueloculina akneriana d'Orbigny either
in the shape of the test and its internal structure or in the character of
the aperture and tooth; thus the form is regarded as a separate species,
not a subspecies of Q. akneriana.
Distribution. - Poland: Upper Tortonian and Lower Sarmatian, (Budy,
Owikozy, Grzyb6w, Ligota Zabrska, Miechocin, Mielec, Mokrzysz6w, Rytwiany,
Wierzchowiska, Zrecze). USSR: Tortonian (Tchokrak), the Crimea­
Caucasian region and West Precaucasus; Lower Sarmatian, Russian
Platform.
+ Varidentella sarmatica (Karrer, 1877)
(Pl. XXVI, Fig. 6a-c; Text-fig. 52)
1877. Quinqueloculina sarmatica Karrer var. typiea Karrer; F. Karrer, p. 375, PI. 16,
Fig. 11a.
1877. Quinqueloeulina sarmatica Karrer var. elongata Karrer; ibidem, p. 375, PI. 16,
Fig. lIb.
1877. Quinqueloeulina sarmatiea Karrer var. virgata Karrer; ibidem, p. 375, PI. 16,
Fig. lIe.
1971. Quinqueloeulina aff. sartaganica (Krasheninnikov); L. S. Maissuradze, p. 50,
PI. 3, Fig. 5.
Material. - Over 100 specimens (ColI. No. F-196, Sec. No. 157-159).
Dimensions: L 0.3-0.35; B 0.2-0.22; T 0.15.
Description. - Test elongate oval, slender, periphery rounded; chambers
of uniform width, arcuate, last chamber slightly extended and
inclined towards the back side of the test,· middle chamber large and
convex, elongate oval in shape, fifth chamber occasionally visible or
invisible; sutures slightly depressed, broad; surface smooth, polished, with