MILIOLIDAE - Acta Palaeontologica Polonica

78 EWA LUCZKOWSKA
1955. Miliolina gracilis (Karrer); M. I. Serova, p. 305, Pl. 2, Figs ~.
1959. Quinqueloculina gracilis Karrer; V. A. Krasheninnikov, p. 77, PI. 11, Fig. 4.
1961. Quinqueloculina gracilis Karrer var. gracilis Karrer; V. I. Didkovsky, p. 17,
PI. 1, Fig. 1.
1968. Quinqueloculina gracilis Karrer; B. Ionesi, p. 261, PI. 12, Figs 13, 14.
1969b. Quinqueloculina gracilis Karrer; A. K. Bogdanowich, p. 84, PI. 2, Figs 1-3.
Material. - About 70 specimens (ColI. No. F-128, Sec. No. 171).
Dimensions: L 0.5-1.2; B 0.3-0.55; T 0.1-0.4.
Description. - Test oval, nearly quadrangular, periphery rounded;
chambers tubular, regular, of uniform width, middle chamber convex,
elongated, slightly curved, fifth chamber clearly visible; sutures depressed;
surface rough, covered with longitudinal shallow grooves; aperture circular
at the end of a short neck or lacking it, with a simple, bifid tooth.
Variability. The oval-quadrangular test shape and tubular chamber
shape are constant. Variable features are the length of the extension of
the last chamber, which occasionally disappears, and the periphery of the
last chambers occasionally with traces of the edges, in which this species
comes close to Cyclojorina contorta (d'Orbigny).
Dimorphism and ontogeny. The specimens sectioned represent the
micro generation; PD 40\-l. All through the ontogeny tubular chambers of
uniform shape are visible (Text-fig. 28/1).
3
1a 2a 3a 3 4a 3 Sa
(1)b~~
@3~
~, ~~, @)., @b"
Fig. 28. Internal structure of Cycloforina: 1 - C. gracilis (Karrer), Upper Tortonian,
Gliwice Stare, micro generation; 2 - C. lucida (Karrer), Upper Tortonian, Gliwice
Stare, micro generation; 3 - C. lachesis (Karrer), Lower Tortonian, Korytnica, micro
generation; 4 - C. suturata (Smigielska), Upper Tortonian, Gliwice Stare, micro generation;
5 - C. hauerina d'Orbigny, Upper Tortonian, Niskowa, micro generation;
a front view, b apertural view, c cross-section.