MILIOLIDAE - Acta Palaeontologica Polonica

48 EWA LUCZKOWSKA
Particular stages of the ontogenetic development of massiline forms
may be observed on specimens the chambers of which are being removed
successively (Text-fig. 14).
Fig. 14. Quinqueloculina buchiana d'Orbigny and its juvenile stage, Lower Tortonian,
Benczyn; 1 - MS; 2-4 - QS from inside of the MS; a front view, b apertural view.
Remarks. - D'Orbigny (1846) described two species from the Miocene
of the Vienna Basin, the morphology of which corresponds with that of
our quinqueloculine forms: Quinqueloculina buchiana, having a smooth
and polished test (d'Orbigny's illustration represents probably a damaged
specimens with traces of regeneration) and Q. ungeriana, the surface of
which is covered with oblique folds. Since such folds, regarded as signs
of disturbances in the normal growth of tests may be observed in some
specimens of both quinqueloculine and massiline forms not only in Q. buchiana
but also in other species (e.g. Q. haidingeri d'Orbigny, Q. anagallis
n.sp), Q. ungeriana has been recognized as a synonym of Q. buchiana.
Q. ungeriana stenostoma Karrer is identical with the quinqueloculine
forms of Q. buchiana and its corrugate border undoubtedly also represents
marks of the abnormal growth of the test. Abundant specimens of Q. buchiana
QS identical with ours were found in the materials from Baden,
but none of them was massiline, probably owing to the small amount of
the material examined. Surely, rare massiline forms were not observed
by d'Orbigny either.
Q. buchiana MS is morphologically nearly identical with Q. anagallis
sp.n. MS, from which it however differs in having a more solid test and
no ornamentation, but it is indistinguishable fromQ. haidingeri d'Orbigny
MS, which is isomorphic but smaller. Differences between these two
species are visible only in cross-sections which show high triangular
quinqueloculine stage with flattened or slightly inflated sides and angular
edges in Q. haidingeri MS (Text-fig. 16), whereas the quinqueloculine
stage of Q. buchiana MS is lower, with flat or concave sides and acute,
sharply keeled edges (Text-fig. 12).