Beedeina 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 : 546-548

Beedeina minuta Akbaş , n. sp.

( Fig. 13E, F )

urn:lsid:zoobank.org:act:1E73CD2E-1886-47F8-BA1A-6C4294DAA3CC

HOLOTYPE. — Specimen no. 18G41.03 .

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

ETYMOLOGY. — Latin minuta , meaning small, named for its smaller size compare to the other species of the genus Beedeina .

MATERIAL EXAMINED. — Two axial sections (specimens nos 18G41.03 and 18G41.06 ).

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

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

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

DESCRIPTION

Test small in size and rhomboidal in shape with lateral sides and pointed to bluntly pointed periphery and poles. All volutions coiled tightly, and the rhomboidal shape of the test is preserved from the first volutions to the last one. Proloculus globular and large, with an outside diameter of 180-210 µm. The number of volutions is up to 4½- 5 in advanced specimens and length ranges between 1.70 to 1.85 mm, diameters range between 1.18 to 1.30 mm and form ratios of 1.31 to 1.57. Wall is thin (0.025 -0.035 mm in the outer volutions), four-layered and composed of a distinct tectum, a diaphanotheca which thickness gradually increases towards outer volutions, and relatively thick lower and upper tectorium ( Fig. 13G ). Septa regularly folded throughout the test. Chomata are massive, symmetrical and rounded.

REMARKS

Beedeina minuta Akbaş , n. sp. differs easily from the other species of genus Beedeina by its smaller test size.

Figures

FIG. 13. — Thin-section photomicrographs of the fusulinid assemblages of the Yassıpınar (YS), Bademli (BS) and GÖlbelen (GS) sections: A, Quasifusulinoides cf. juvenatus Kireeva in Bogush, 1963, subaxial section, 19B48.08, BS; B, Quasifusulinoides quasifusulinoides (Rauzer-Chernousova in Rauzer-Chernousova, Gryzlova, Kireeva, Leontovich, Safonova & Chernova, 1951), axial section, 19B48.06, BS; C, D, Beedeina elegans (Rauzer-Chernousova & Belyaev in Rauzer-Chernousova, Belyaev & Reytlinger, 1940); C, subaxial section, 16B40B.08, BS; D, subaxial section, 18G48.03, GS; E, F, Beedeina minuta Akba ¸s, n. sp.; E, axial section, 18G41.03 (Holotype), GS; F, axial section, 18G41.06, GS; G, detailed view of the wall structure of the Beedeina minuta Akba¸s, n. sp., 18G41.06 (Four layered wall including tectum, diaphanotheca, lower and upper tectorium); H, Beedeina cf. nytvica callosa (Safonova in Rauzer-Chernousova, Gryzlova, Kireeva,