Praefusulinella 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 : 548

Genus Praefusulinella Akbaş , n. gen.

urn:lsid:zoobank.org:act:2971ADCE-8942-4F7D-AD06-E8902541AC2B

TYPE SPECIES. — Praefusulinella okuyucui Akbaş , n. sp.

DIAGNOSIS. — Test large, subspherical to ovoid and planispiral. Wall is four-layered. Septa slightly folded. Chomata massive, spherical to subquadrate in shape.

ETYMOLOGY. — Latin prae, previous, because of the similarity and a possible ancestor of the genus Fusulinella Möller.

INCLUDED TAXA. — Praefusulinella guvenci Akbaş , n. gen., n. sp. ( Figs 14N, O ; 15A ), Praefusulinella okuyucui Akbaş , n. gen., n. sp. ( Fig. 15 C-G), Praefusulinella rhombiforma Akbaş , n. gen., n. sp. ( Fig. 16 A-C) and Praefusulinella tekini Akbaş , n. gen., n. sp. ( Fig.16 E-I).

STRATIGRAPHIC RANGE. — Upper Moscovian.

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

DESCRIPTION

Test large in size, entirely planispiral and involute, subspherical to ovoid in shape, or subrhomboidal in some specimens with spherical initial volutions. The coiling of the spiral is moderately tight and followed by some loosely coiled last volution in some adult forms. Wall is thick and four-layered including tectum, diaphanotheca, lower and upper tectorium. Septa regularly and slightly folded across the centre of the test and folded near the polar extremities. Chomata are massive, symmetrical and rounded to subquadrate or short ribbon-like in some specimens.

REMARKS

Praefusulinella Akbaş , n. gen. is similar to the genus Fusulinella concerning the wall structure and septal fluting. However, the new genus differs by its thick wall, inflated subspherical to ovoid test shape and spherical initial volutions.

Figures

FIG. 14. — Thin-section photomicrographs of the fusulinid assemblages of the Yassıpınar (YS), Bademli (BS) and GÖlbelen (GS) sections: A-D, Beedeina schellwieni (Staff in Schellwien & Staff, 1912); A, axial section, 16B40A.09, BS; B, axial section, 16B40C.11, BS; C, axial section, 18G41.15, GS; D, oblique section, 18G45.07, GS; E, F, Beedeina tauridiana Akba ¸s, n. sp.; E, axial section, 16B41.07 (Holotype), BS; F, axial section, 16B41.08, BS; G, detailed view of the wall

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.

FIG. 16. — Thin-section photomicrographs of the fusulinid assemblages of the Yassıpınar (YS), Bademli (BS) and GÖlbelen (GS) sections: A-C, Praefusulinella rhombiforma Akba ¸s, n. gen., n. sp.; A, axial section, 18G40.06, GS; B, axial section, 18G40.10, GS; C, axial section, 18G40.11 (Holotype), GS; D, detailed view of the wall structure of the Praefusulinella rhombiforma Akba¸s, n. gen., n. sp., 18G40.11 (holotype) (four-layered wall including tectum, diaphanotheca, lower and upper tectorium); E-I, Praefusulinella tekini Akba¸s, n. gen., n. sp.; E, axial section, 18G40.12, GS; F, axial section, 18G40.13, GS; G, axial section, 18G40.15, GS; H, axial section, 18G40.17.01, GS; I, axial section, 18G40.21 (holotype), GS; J, detailed view of the wall structure of the Praefusulinella tekini Akba¸s, n. gen., n. sp., 18G40.21 (holotype) (four-layered wall including tectum, diaphanotheca, lower and upper tectorium). Scale bar: 1 mm except D, J, 500 µm.