MILIOLIDAE - Acta Palaeontologica Polonica

32 EWA LUCZKOWSKA
The character that these species have in common is their rough surface
with short incised lines, quite different from the smooth and shiny "porcellaneous"
surface in other species. Except for pointing at the supposed
relationship between these forms, however, the presence of rough walls
does not seem to be of any major taxonomic importance.
A relationship can also be seen between different species of Quinqueloculina
with shiny "porcellaneous" tests. It is manifested by the fact that.
e.g. in some juvenile specimens of Quinqueloculina anagallis, whose tests
are normally ornamented with ribs, an entirely smooth and shiny chamber
appears as in Q. buchiana (PI. I, Fig. 1). The relationship between Q. peregrina
and Q. dichotoma is another example; they have quite a 'similar
shape and internal structure and differ only in that Q. dichotoma has its
surface ornamented with ribs. Q. buchiana also resembles Q. pseudobuchiana
in shape and internal structure but differs from it in having slightly
rounded edges of the chambers instead of keeled ones. Q. akneriana
and Q. triangularis are also related forms and differ only in that Q. triangularis
has a broader and higher test. There are presumably other related
species as well: Articulina sarmatica and A. multibullata, Pyrgoella ventruosa
and P. controversa, Sinuloculina consobrina and S. nitens, Affinetrina
gualtieriana and A. planciana (both having a rough surface with
short incised lines), Varidentella reussi, V. sarmatica and V. latelacunata,
V. pseudocostata and V. rotunda and many other species.
INTERGENERIC TRANSITION FORMS
Difficulties encountered in determining some miliolid genera result
chiefly from the fact that there are species having "mixed" diagnostic
characters, which rose doubts if these species have been included in
appropriate genera. Such characters are, above all, the shape of the
aperture and tooth and the number of chambers seen from the outside.
For example, Gla