Fusulinella obtusa minuta 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 : 556-558

Fusulinella obtusa minuta Akbaş , n. subsp.

( Fig. 17 P-R)

urn:lsid:zoobank.org:act:1FA05BA1-6DE1-487B-BB69-D334BFF7AE19

HOLOTYPE. — Specimen no. 15Y37.08.01 .

DIAGNOSIS. — A species of genus Fusulinella with small and shortfusiform test, straight lateral sides and pointed poles.

ETYMOLOGY. — Latin minuta , meaning small, named for its smaller test size.

MATERIAL EXAMINED. — Three axial sections (specimens nos 15Y37.07 , 15Y37.08.01 and 15Y38.04 ).

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

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

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

DESCRIPTION

Test small to moderate in size and inflated short-fusiform in shape with straight lateral sides and pointed poles. All volutions are coiled relatively tight. The initial volutions are spherical in shape while test elongates in last one or two volutions. Proloculus globular and small, with an outside diameter of 20-70 microns. The number of volutions is up to 6-6½ in advance specimens, and length ranges between 1.54 to 2.12 mm, diameters range between 1.06 to 1.50 mm and form ratios of 1.41 to 1.50. Thin wall (0.025 -0.080 mm in the outer volutions) is not well differentiated, but is composed of tectum, diaphanotheca, lower and upper tectorium ( Fig. 17S ). The diaphanotheca is very thin and not separate from lower tectorium in some specimens. Septa slightly folded throughout to the coiling axis of the test. Chomata are rounded to short ribbon-like in shape.

REMARKS

Fusulinella obtusa minuta Akbaş , n. subsp. is most similar to Fusulinella obtusa obtusa Grozdilova, 1966 concerning the shape of the test, relatively tight coiling and the shape of chomata, but differs by smaller size of the 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