MILIOLIDAE - Acta Palaeontologica Polonica

~ 3
lmm
148 EWA LUCZKOWSKA
Subfamily Sigmoilinitinae subfam. n.
Diagnosis: Two chambers to whorl, initial stage sigmoiline, Lg. with chambers
alternating in planes of coiling at angles increasing gradually to 180°, later chambers
usually in a single plane. Eocene to Recent. Genera included: Sigmoilinita Seiglie,
1965; Nummoloculina Steinmann, 1881; Schlumbergerina Munier-Chalmas, 1882;
Spirosigmoilina Parr, 1942.
Genus Sigmoilinita Seiglie, 1965
X + Sigmoilinita tenuis (Czjzek, 1848)
(Pi. XVI, Figs 1-3; Text-fig. 53/3)
1848. Quinqueloculina tenuis Czjzek; J. Czjzek, p. 149, Pi. 13, Figs. 31-34.
1877. Spiroloculina berchtoldsdorfensis Karrer, p. 375, Pi. 16a, Fig. 10.
1951. Sigmoilina tenuis (Czjzek); P. Marks, p. 39, Pi. 5, Fig. 7.
1952. Sigmoilina tenuis (Czjzek); A. K. Bogdanowich, p. 159, Pi. 23, Figs 1-4.
1956. Sigmoilina tenuis (Czjzek); A. Sulimski, p. 83, Pi. 1, Fig. la-e.
1960. "Sigmoilina" tenuis (Czjzek); R. W. Barker, Pi. 10, Figs 7, 8, 11.
1965. Sigmoilinita tenuis (Czjzek); G. A. Seiglie, p. 72.
1968. Spiroloculina tenuis (Czjzek); I. Korecz-Laky, p. 63, Pi. 4, Fig. 11.
1970. Sigmoilina tenuis (Czjzek); D. Verhoeve, p. 28, Pi. I, Fig. 11.
Material. - About 100 specimens (ColI. No. F-197, Sec. No. 426, 427).
Dimensions: L 0.4-0.6; B 0.18-0.3; T 0.04-0.05
lmm
~2
Fig. 53. Internal structure of Nummoloculina, Sigmoilinita and Spirosigmoilina:
I, 2 - Nummoloculina contraria (d'Orbigny), Lower Tortonian, Wieliczka; 1 - micro
generation, 2 - mega I generation; 3 - Sigmoilinita tenuis (Czjzek), Upper Tortonian,
Krywald borehole, depth 72-74 m, micro generation; 4 - Spirosigmoilina speciosa
(Karrer), Lower Tortonian, Korytnica, micro generation; 5 - Spirosigmoilina cTenata
(Karrer), Lower Tortonian, Korytnica, micro generation.
Description. - Test rhomboid-oval, tapering at both ends, flat, periphery
rounded; chambers tubular, narrow, arranged stepwise in a single
plane, 3-5 on each side of the slightly oblique juvenile stage, two outer
chambers broad with flattened sides and slightly marked longitudinal
grooves along the sutures; sutures somewhat depressed; surface smooth,