Praefusulinella okuyucui Akbaş, 2022

Akba, Melikan & Okuyucu, Cengiz, 2022, Fusulinid Biostratigraphy of the Moscovian- Lower Kasimovian of Hadim Nappe, Central Taurides, southern Turkey, Geodiversitas 44 (19), pp. 527-562 : 550

Praefusulinella okuyucui Akbaş , n. gen., n. sp.

( Fig. 15 C-G)

urn:lsid:zoobank.org:act:B5C029FC-4729-4E42-BAE7-7AC0B952CF1B

HOLOTYPE. — Specimen no. 18G40.07 .

DIAGNOSIS. — A species of Praefusulinella Akbaş , n. gen. with very large and inflated short-fusiform to subspherical test, convex lateral sides and widely rounded poles.

ETYMOLOGY. — This species is named after Prof. Dr. Cengiz Okuyucu, Konya Technical University, Konya, Turkey, in honour of his contributions to the knowledge of Carboniferous-Permian fusulinids biostratigraphy.

MATERIAL EXAMINED. — Four axial sections (specimens nos 18G40.03 , 18G40.07 , 18G40.18 and 18G41.10 ), one subaxial section (specimens no. 16B38.13 ).

TYPE LOCALITY. — Gölbelen and Bademli sections of Hadim Nappe (Hadim/ Konya, Bademli-Akseki/ Antalya, Central Taurides, Turkey).

STRATIGRAPHIC RANGE. — Carboniferous, Pennsylvanian, Upper Moscovian, Kashirian-Podolskian.

OCCURRENCE. — Gölbelen and Bademli Sections of the Hadim Nappe (BozkIr/ Konya; Bademli-Akseki/ Antalya, Central Taurides , Turkey).

DESCRIPTION

Test large in size and more-inflated short-fusiform to subspherical in shape with convex lateral sides and widely rounded poles. The coiling of the spiral is relatively irregular. The initial volutions are tight and short-fusiform in shape, succeeding volutions loosely coiled. Proloculus globular and moderately in size, with an outside diameter of 100-190 microns. The number of volutions is up to 5-7 in advance specimens, and length ranges between 2.78 to 3.55 mm, diameters range between 1.98 to 2.73 mm and form ratios of 1.30 to 1.46. Four-layered wall is thick (0.045 -0.090 mm in the outer volutions) and composed of a tectum, a well-developed and prominent diaphanotheca and dark lower and upper tectorium ( Fig. 15H ). Septa plain to slightly folded in initial volutions and folded in outer volutions across the centre of the test. Chomata are massive, symmetrical and rounded in shape and their heights reach to nearly height of chamber.

REMARKS

Praefusulinella okuyucui Akbaş , n. gen., n. sp. is partly similar to some specimens of genus Fusulinella concerning the fourlayered wall and septal fluting, but it easily differs from them by more large and nearly spherical test shape.

Figures

FIG. 15. — Thin-section photomicrographs of the fusulinid assemblages of the Yassıpınar (YS),Bademli (BS) and GÖlbelen (GS) sections:A, Praefusulinella guvenci Akba ¸s, n. gen., n. sp., axial section, 18G40.20, GS; B, detailed view of the wall structure of the Praefusulinella guvenci Akba¸s, n. gen., n. sp., 18G40.16 (four-layered wall including tectum, diaphanotheca, lower and upper tectorium); C-G, Praefusulinella okuyucui Akba¸s, n. gen., n. sp.; C, subaxial section, 16B38.13, BS; D, axial section,18G40.03, GS; E, axial section,18G40.07 (Holotype), GS; F, axial section,18G40.18, GS; G, axial section,18G41.10, GS; H, detailed view of the wall structure of the Praefusulinella okuyucui Akba ¸s, n. gen., n. sp., 18G40.03 (four-layered wall including tectum, diaphanotheca, lower and upper tectorium). Scale bar: 1 mm except B, H, 500 µm.