Neoplanorbulinella malatyaensis, Gedik, 2017

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

Neoplanorbulinella malatyaensis n. sp. ( Fig. 6 E-H)

HOLOTYPE. — Equatorial section, Fig.6F (sample no. HYM-36A/5/1).

TYPE LOCALITY. — Karamağara village, NE Akçadağ, W Malatya, Eastern Turkey, HYM-first unit.

AGE. — Rupelian-Early Chattian (SB 21-22).

DIAGNOSIS. — Neoplanorbulinella with large, low conical to lenticular test, having equatorial chambers around the cone, lateral chambers underdeveloped in umbilical cavity, and calcareous wall.

ASSEMBLAGE. — The same assemblage as for Neoplanorbulinella matsumarui n. sp.

ETYMOLOGY. — From Malatya, a city of eastern Turkey.

DESCRIPTION

Only megalospheric form is observed.This form has a low conical to lenticular test of large size. The basal diameter of the cone reaches 1.18 mm and the cone maximum height is 0.42 mm. The apical angle is about 140°. The large, spherical megalosphere (its diameter 65 µm) is situated at the top of the cone, and it is followed by the second chamber (its diameter 78 µm; Fig. 6F) and arcuate equatorial chambers. The umbilical cavity is very wide and its diameter is 0.85 mm. Lengthened umbilical cavity is filled by underdeveloped lateral chambers ( Fig. 6H).

COMPARISON

Neoplanorbulinella malatyaensis n. sp. differs from N. matsumarui n. sp. in possessing larger and low conical to lenticular test, greater apex angle, almost flat base of cone, larger proloculus and greater number and larger equatorial chambers, which are observed in axial sections.