MILIOLIDAE - Acta Palaeontologica Polonica

152 EWA LUCZKOWSKA
1946. Hauerina speciosa (Karrer); J. A. Cushman, p. 5, PI. 1, Fig. 14a, b.
1952. Spiroloculina (?) crenata Karrer; A. K. Bogdanowich, p. 154, PI. 22, Fig. 4a-c.
1955. Spiroloculina crenata Karrer; M. J. Serova, p. 326, PI. 12, Figs 1-4.
Material. - 10 specimens (ColI. No. F-202, Sec. No. 413, 430, 431).
Dimensions: L 0.35-0.45; B 0.25-0.37; T 0.1-0.15
Description. - Test broadly oval, flat, periphery truncate; two outer
chambers narrow, arcuate, of uniform width, arranged in a single plane,
middle chambers in sigmoiline arrangement, 1-3 on each side of juvenile
stage; sutures depressed; surface covered with 5-8 large, prominent
protuberances on each chamber, separated by broad furrows and making
a regular corrugate pattern on the periphery; wall smooth, polished;
aperture elongate, narrow somewhat broader at the base and at the top,
with lateral edges enlarged and somewhat bent inwards, and filled with
a long, simple tooth.
Variability and ontogeny. The shape of the aperture is variable. It
is usually as an elongated slit, filled entirely with a simple tooth, but in
some specimens the lateral extensions are somewhat sinuous and inclined
inside the aperture. The number of protuberances on each chamber is also
variable but not greater than 8 on each chamber. The internal structure
is sigmoiline. The sections show chambers gradually increasing in size,
arranged in two spiral lines then in a sinusoid line to attain a planispiral
arrangement finally (Text-fig. 53/5).
Remarks. - Our specimens are identical with those from Lapugiu
and Buitur in Romania, having the same elongated narrow aperture. Only
two specimens from Buitur have sinuous and inclined lateral edges of the
aperture. This character of the aperture is connected with the ornamentation
of the test, but probably caused Cushman (1946) to include this
species in the genus Hauerina. However, none of the specimens
investigated, either from Korytnica or from Buitur in Romania, has
a cribrate aperture; besides, they both have a sigmoiline, not quinqueloculine,
internal structure, as in Hauerina.
Collins (1958) is of the opinion that the Recent species named Spiroloculina
crenata Karrer by Brady (1884) is similar to but not identical
with this species; nevertheless, neither does it belong to the genus
Hauerina, having a sigmoiline initial stage. Collins considers it to be a new
species belonging to the genus Spirosigmoilina and gives it the name of
Spirosigmoilina bradyi.
This species is very similar to the related species Spirosigmoilina
speciosa (Karrer), but differs in having fewer and larger protuberances
in the chambers, a thicker test and truncate periphery.
Distribution. - Poland: Tortonian (Gliwice Stare, Karsy, Korytnica).
Romania: Tortonian, Kostej in Banat, Lapugiu, Buitur. USSR: Miocene,
West Ukraine.