MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 109
1961. Triloeulina eubanica (Bogdanowich) var. cubanica (Bogdanowich); V. J. Didkovsky,
p. 109, PI. 18, Fig. 4a-c.
Material. - 15 specimens (ColI. No. F-160, Sec. No. 340, 403).
Dimensions: L - 0.2-0.4; B - 0.15-0.35; T - 0.1-0.2.
Description. - Test very small, nearly circular, tapering towards the
aperture, periphery broadly rounded; chambers inflated, slightly narrowing
towards the aperture, middle chamber narrow and oblique; sutures
somewhat depressed; wall thin; surface smooth, polished; aperture in the
form of a high narrow slit, slightly widened at the top, placed somewhat
oblique to the penultimate chamber, sloping, and filled with a simple
longitudinal tooth.
Variability. Some specimens of this species are more regularly oval
in shape. Its prominent feature is the arcuate border of the aperture,
which is always in an oblique position.
Dimorphism and ontogeny. The specimens sectioned belong to the micro
generation; PD 30 11. The internal structure initially cryptoquinqueloculine,
then triloculine (Text-fig. 38/5).
Remarks. - This species differs from Affinetrina ucrainica (Serova,
1952) in its more rounded test shape, considerably thinner wall, and the
oblique position of the aperture.
Distribution. - Poland: Upper Tortonian, Gliwice Stare, Grabowiec,
Grzyb6w, Wf:glinek, Zrecze). USSR: Lower and Middle Sarmatian, Black
sea Depression, North and West Caucasus and Ukraine.
Affinetrina gualtieriana (d'Orbigny, 1839)
(pI. XXVI, Figs 1, 2; Text-fig. 38/3)
1839. Triloculina gualtieriana d'Orbigny; A. d'Orbigny, in: Ramon de la Sagra, p. 170,
Pl. 9, Figs 5-7; fide Catalogue Ellis & Messina.
Material. - 60 specimens (ColI. No. F-161, Sec. No. 390-392).
Dimensions: L - 0.3-0.6; B - 0.18-0.35; T - 0.1-0.2.
Description. - Test quadrangular-oval, elongated, regular, subtriangular
in cross-section, periphery narrowly rounded; chambers flat, of nearly
uniform width, strongly expanded at the aperture, middle chamber narrow
and elongated; sutures flat, distinct; wall thin; surface covered with
irregular thick short striations, giving the test its rough appearance;
aperture high, narrow, with arcuate border, which is bent to the back
and parallel to the flattening of the test, with long simple tooth, sometimes
projecting beyond the aperture edge.
Variability. The test shape is stable, the flattening of chambers variable,
its degree being occasionally slightly differentiated. The number of
chambers visible from outside varies from 3 to 5.
Dimorphism and ontogeny. The specimens sectioned belong to the
micro generation; PD 30 11. The internal structure is cryptoquinqueloculine