MILIOLIDAE - Acta Palaeontologica Polonica

MILIOLIDAE FROM MIOCENE OF POLAND 71
Description. - Initial part small, circular planispirally coiled as in
Adelosina; uniserial part composed of 3--4 large, oval, elongated chambers
much increasing in size and ornamented with 4--6 thick costae; aperture
circular, without tooth, surrounded with a thickened rim.
Remarks. - The specimens of this conspicuous species are usually
found as one-, rarely two- or three-chambered parts of the uniserial
stage. No complete specimens occur in the materials investigated, thus
the description is based on the well-preserved specimens from Voslau
in Vienna Basin. The initial part probably represents the mega II generation,
like that in Adelosina. The micro generation has not been found in
any of the materials examined, nor was it found by Karrer.
Distribution. - Poland: Lower Tortonian (Karsy, Korytnica). Austria:
Lower Tortonian, vicinity of Baden and Voslau, Vienna Basin. Czechoslovakia:
Lower Tortonian, Zidlochovice. Romania: Lower Tortonian, Lapugiu
de Sus.
* + - Articulina problema Bogdanowich, 1952
(pI. XVII, Figs 7-10)
1852. Articulina problema Bogdanowich; A. K. Bogdanowich, p. 205, PI. 31, Figs 2,
3-6,9.
1956. Articulina problema Bogdanowich; A. Sulimski, p. 86, PI. 4, Fig. l.
1958. Articulina problema Bogdanowich; 1. V. Venglinsky, p. 93, PI. 19, Figs 1-10.
1960. Articulina problema Bogdanowich; M. Stancheva, p. 13, PI. 31, Fig. 6.
1968. Articulina problema Bogdanowich; B. Ionesi, p. 264, PI. 14, Figs 13, 14.
Material. - Over 100 specimens (ColI. No. F-120)
Dimensions: Initial part L 0.1-0.3; uniserial part L up to a few mm.
Description. - Initial part small, composed of several chambers irregularly
arranged around the proloculus, at first planispirally, then in
a triloculine or quinqueloculine manner; uniserial part long, with many
chambers slightly increasing in size, slender and somewhat inflated at
the base like an amphora; surface smooth, in older specimens with irregular,
longitudinal wrinkles; aperture circular, surrounded with a thickened
rim, without tooth.
Variability and ontogeny. Variability is noted in the irregularly coiled
initial part and in elongated chambers, which may be very slender but
a little inflated at the base (PI. XVII, Fig. 8) or they may be shorter and
stouter (PI. XVII, Fig. 7). Two generations, micro and mega, are present.
Remarks. - Forms with shorter and stout chambers resemble Articulina
sarmatica (Karrer) from which they however differ in having more
elongated chambers, which are never spherical.
Distribution. - Poland: Lower Sarmatian (Dwikozy, Grzyb6w, Miechocin,
Mokrzysz6w, Rytwiany, Zrecze). Bulgaria: Lower and Middle Sarmatian,
North-West Bulgaria. Romania: Lower and Middle Sarmatian, Mol-