MILIOLIDAE - Acta Palaeontologica Polonica

68 EWA LUCZKOWSKA
juvenile stage was identified as Miliolina karreriella Venglinsky. Later
he joined these two species into one, Quinqueloculina karreriella var.
articulata. Articularia karreriella occurs commonly in thecompaily of
Cydoforina karreri ovata (SEirova), to which it may also be related.
In the materials investigated there also occur Articulina species with
a cyclogyrine initial part, like A. nodosaroides (Karrer), A. problema Bogdanowich,
A. sarmatica (Karrer). The other species need revision.
Articularia articulinoides (Gerke & Issaeva, 1952)
(PI. XVII, Fig. la, b,2a-c)
1952. Articulina (?) articulinoides Gerke & Issaeva; in A. K. Bogdanowich, p. 211,
PI. 23, Fig. 8.
1956. Articulina (?) articulinoides Gerke & Issaeva; A. G. Voroshilova in V. M. Pobiedina
et al., p. 118, PI. 14, Fig. 3a-c.
1960. Articulina (?) articulinoides Gerke & Issaeva; M. Stancheva, p. 13, PI. 2, Fig. 5.
Material. - Over 50 specimens (ColI. No. F-116).
Dimensions: Initial part: L 0.3-0.5; uniserial part L 0.3-0.4.
Description. - Initial part large, oval; chambers tubular in quinqueloculine
or cryptoquinqueloculine arrangement; surface smooth, sutures
double, flat; uniserial part composed of 1-2 elongated chambers, widened
at the base and narrowing towards the end; aperture of the initial part
semicircular with broad tape-shaped tooth; that of the uniserial part
circular, surrounded with a thickened rim and without a tooth.
Variability and ontogeny. The initial part is morphologically uniform.
The uniserial part has usually a slightly oblique position in relation to the
coiling axis and there exists a series of intermediate forms between
the quinqueloculine and uniserial stage.
Remarks. - The forms examined most resemble one of the forms
illustrated by Bogdanowich, 1952, (PI. 23, Fig. 8), while the other illustrations
of this species (Fig. 6, 7) are somewhat different. They are also
similar to Articulina arcuata Bogdanowich, 1967 from which they however
differ in having a distinctly developed quinqueloculine stage and the
chambers of uniserial stage basically inflated and more elongated. The
initial stage of A. articulinoides is very close to Varidentella reussi (Bogdanowich),
which was observed earlier by the authors of both species
(Bogdanowich, 1952), who regarded them as related. The resemblance is
particularly apparent in the semicircular shape of the aperture and in the
broad, tape-shaped tooth. A. articulinoides may have arisen from Varidentella
reussi and the initial stage of this process may have occurred in
the Lower Sarmatian.
Distribution. - Poland: Lower Sarmatian (Grzyb6w, Miechocin, Mokrzysz6w,
Rytwiany). Bulgaria: Lower Sarmatian, the northwestern
region of Bulgaria. USSR: Lower Sarmatian, North Caucasus, Azerbaijan,
Ukraine, Moldavia.