Fusulinella absoluta 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 : 556

Fusulinella absoluta Akbaş , n. sp.

( Fig. 17 A-E)

urn:lsid:zoobank.org:act:AE1C84CE-556D-45A8-A852-507BA4248D6F

HOLOTYPE. — Specimen no. 16B38.10 .

DIAGNOSIS. — A species of genus Fusulinella with large and inflated cylindrical test, convex lateral sides and irregularly developed knob-like poles.

ETYMOLOGY. — Latin absoluta , meaning advanced, named for its well-developed and large test.

MATERIAL EXAMINED. — Three axial sections (specimens nos 16B38.04 , 16B38.11 and 16B40.07 ), two subaxial sections (specimens nos 16B38.09 and 16B38.10 ).

TYPE LOCALITY. — Bademli section of Hadim Nappe (Bademli-Akseki/ Antalya, Central Taurides, Turkey).

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

OCCURRENCE. — Bademli section of Hadim Nappe (Bademli-Akseki/ Antalya, Central Taurides, Turkey).

DESCRIPTION

Test large in size and inflated cylindrical in shape with convex lateral sides and rounded poles in initial volutions, but irregularly developed knob-like poles in outermost volutions. All volutions are coiled loosely. Proloculus globular and moderately in size, with an outside diameter of 112-160 microns. The number of volutions is up to 4½-6½ in advance specimens, and length ranges between 2.55 to 3.98 mm, diameters range between 1.50 to 2.03 mm and form ratios of 1.64 to 1.96. Four-layered wall is moderately thick (0.025 -0.080 mm in the outer volutions), and composed of a thin tectum, a prominent and thick diaphanotheca, thick-dark lower and upper tectorium ( Fig. 17F ). Septa plain in initial volutions but folded in outermost one to two volutions. Chomata are massive, asymmetrical and rounded to subquadrate in shape.

REMARKS

Fusulinella absoluta Akbaş , n. sp. shows similarity with Fusulinella helenae by its elongate test and knob-like polar regions but differs by having ovoid initial volutions and more inflated test.

Figures

FIG. 17. — Thin-section photomicrographs of the fusulinid assemblages of the Yassıpınar (YS),Bademli (BS) and GÖlbelen (GS) sections:A-E, Fusulinella absoluta Akba ¸s, n. sp.; A, axial section, 16B38.04, BS; B, subaxial section, 16B38.09, BS; C, subaxial section, 16B38.10 (Holotype), BS; D, axial section, 16B38.11, BS; E, axial section, 16B40.07, BS; F, detailed view of the wall structure of the Fusulinella absoluta Akba¸s, n. sp., 16B38.10 (holotype) (four-layered wall including tectum, diaphanotheca, lower and upper tectorium); G, H, Fusulinella bocki bocki MÖller, 1878; G, axial section, 16B42.03, BS; H, axial section, 18G48.06, GS; I, Fusulinella bocki pauciseptata Rauzer-Chernousova & Belyaev in Rauzer-Chernousova, Belyaev & Reitlinger, 1936, axial section, 16B43.22, BS; J, Fusulinella cf. bocki timanica Rauzer-Chernousova in Rauzer-Chernousova, Gryzlova,Kireeva, Leontovich,Safonova & Chernova, 1951, axial section, 15Y39.05,YS; K, Fusulinella cf. colaniae colaniae Lee & Chen in Lee, Chen & Chu, 1930, axial section, 18G56.04, GS; L, Fusulinella colaniae meridionalis Rauzer-Chernousova in