Neoplanorbulinella, Matsumaru, 1976

Gedik, Fatma, 2017, First record of the new Neoplanorbulinid species (Foraminifera) from the Early Oligocene in Turkey, Malatya Basin, Eastern Taurids, Geodiversitas 39 (2), pp. 273-284 : 280-282

Neoplanorbulinella sp.

( Fig. 6I)

DESCRIPTION

Only one specimen is observed. This form has a very high conical test with large size. The basal diameter of the cone reaches 0.8 mm and the cone height is 0.8 mm. The apical angle is 90°. The spherical megalosphere (diameter 65 µm) is situated at the top of the cone, followed by arcuate equatorial chambers. The size of the equatorial chambers increases gradu-

axial section,showing protoconch followed by planispiral chambers (HYM-36A/6/1); O, Borelis merici Sirel & Gündüz,1981 ,non-centered axial section (HYM-36A/5/4); P, Borelis pygmaea ( Hanzawa,1930) ,axial section,megalospheric form (HYM-36A/1/1); Q -R, Penarchaias glynnjonesi ( Henson,1950) ,axial section,megalospheric forms showing protoconch followed by planispiral chambers and chambers with uncoiled stage (HYM-36A/3 and HYM-36A).Scale bar:A-I,O-S, 0.25 mm;J-N,0,5 mm.

ally from the apex to the base. The diameter of umbilical cavity is 0.42 mm, which is filled by numerous lateral chambers.

COMPARISON

Neoplanorbulinella sp. resembles N. malatyaensis n. sp. and N. matsumarui n. sp. in general appearance, but is distinguished by having very high conical test and larger size. In addition, it differs from N. malatyaensis n. sp. and N. matsumarui n. sp. in possessing numerous equatorial chambers and coarser structure of lateral chambers in the umbilical cavity. Neoplanorbulinella sp. is found in the Karamağara section together with N. matsumarui n. sp. and N. malatyaensis n. sp.