Praefusulinella tekini 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 : 554

Praefusulinella tekini Akbaş , n. gen., n. sp.

( Fig. 16 E-I)

urn:lsid:zoobank.org:act:36640616-8101-4D4C-A86E-971D6CA2F68A

HOLOTYPE. — Specimen no. 18G40.21 .

ETYMOLOGY. — This species is named after Prof. Dr. Uğur Kağan Tekin, Hacettepe University, Ankara, Turkey, in honour of his contributions to the knowledge of Mesozoic Radiolarians taxonomy.

MATERIAL EXAMINED. — Five axial sections (specimens nos 18G40.12 , 18G40.13 , 18G40.15 , 18G40.17.01 and 18G40.21 ).

TYPE LOCALITY. — Gölbelen section of Hadim Nappe (BozkIr/ Konya, Central Taurides, Turkey).

DIAGNOSIS. — A species of Praefusulinella Akbaş , n. gen. with large and inflated short-fusiform test, convex lateral sides and pointed poles.

STRATIGRAPHIC RANGE. — Carboniferous, Pennsylvanian, upper Moscovian, Podolskian.

OCCURRENCE. — Gölbelen section of the Hadim Nappe (BozkIr/ Konya, Central Taurides, Turkey).

DESCRIPTION

Test relatively large in size and inflated short-fusiform in shape with convex lateral sides and narrowly rounded to pointed poles. The test takes its shape with first volutions and preserved throughout its evolution.The initial volutions are coiled tightly, but latters loosely. Proloculus globular and moderately in size, with an outside diameter of 130-190 microns. The number of volutions is up to 4½-5½ in advanced specimens, and length ranges between 2.15 to 2.90 mm, diameters range between 1.35 to 1.85 mm and form ratios of 1.48 to 1.59 (mostly 1.57- 1.59). Four-layered wall is moderately thick (0.035 -0.070 mm in the outer volutions), and composed of a prominent tectum, a very distinct diaphanotheca, thin-dark lower and thick-dark upper tectorium ( Fig. 16J ). Septa folded across the coiling axis. Chomata are massive, symmetrical and subribbon-like to rounded in shape and their heights reach to half height of chamber or pass it.

REMARKS

Praefusulinella tekini Akbaş , n. gen., n. sp. is similar to Fusulinella bocki bocki and Fusulinella bocki timanica , but it differs from them by smaller test and low L/D (L/D ratio of Fusulinella bocki bocki is 2.00 and L/D ratio of Fusulinella bocki timanica is range between 1.70 to 1.80), ovoid initial volutions and subribbon-like chomata.

Figures

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.