Aljutovella typica 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 : 546

Aljutovella typica Akbaş , n. sp.

( Fig. 12Q, R )

urn:lsid:zoobank.org:act:EF8425B5-C191-4B86-8729-D84FAA87C6EE

HOLOTYPE. — Specimen no. 15Y30.08 .

DIAGNOSIS. — A species of genus Aljutovella with inflated fusiform test, straight to convex lateral sides and distinct quadrate chomata shape.

ETYMOLOGY. — Latin typica , meaning typical, named for its very characteristic shape that can be easily distinguished from other species of genus Aljutovella .

MATERIAL EXAMINED. — Two axial sections (specimen nos 15Y30.08 and 18G29.09 ) and one tangential section.

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

STRATIGRAPHIC RANGE. — Carboniferous, Pennsylvanian, lower Moscovian, Vereian-Kashirian.

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

DESCRIPTION

Test small in size and inflated fusiform to subrhomboidal in shape with straight quite-sloping lateral sides and bluntly pointed to narrowly rounded and protuberant poles. All volutions coiled straight and relatively tight. The test of first one to two initial volutions spherical to subnautiloid in shape becoming the elongate towards the outer volutions. The outer shell shape is inflated fusiform. Proloculus is globular and small, with an outside diameter of 72 to 80 microns. The number of volutions is up to 4-5 in advanced specimens, and length ranges between 1.63 to 1.65 mm, diameters range between 0.94 to 0.97 mm and form ratios of 1.68 to 1.76. Wall is thin (0.02-0.035 mm in the outer volutions), three-layered and composed of a dark and thin tectum, dense and grey lower and upper tectorium ( Fig. 12S, T ). Septa plain in first one to two volutions while slightly folded in outer volutions. Chomata massive and quadrate in shape, their heights reach to half height of the chamber.

REMARKS

Aljutovella typica Akbaş , n. sp. differs from the other species of genus Aljutovella by its typical shape of test while it is slightly similar to the Aljutovella postaljutovica , differings by having narrower chomata and weaker septal fluting.

Figures

FIG. 12. — Thin-section photomicrographs of the fusulinid assemblages of the Yassıpınar (YS), Bademli (BS) and GÖlbelen (GS) sections: A, B, Aljutovella pojarkovie Dzhenchuraeva 1979; A, axial section, 15Y33.08, YS; B, axial section, 15Y37.09, YS; C, D, Aljutovella postaljutovica Safonova in Rauzer-Chernousova, Gryzlova,Kireeva,Leontovich,Safonova & Chernova,1951; C, subaxial section,15Y30.04,YS;D axial section,18G29.04,GS;E-G, Aljutovella priscoidea (Rauzer- Chernousova, 1938); E, axial section, 15Y24.19, YS; F, axial section, 16B35.04, BS; G, axial section, 15Y24.25, YS; H, I, Aljutovella skelnevatica (Putrya & Leon-