Orbiculiformella pulchra Tekin, 2020

Tekin, Kagan, Krystyn, Leopold, Okuyucu, Cengiz, Bedi, Yavuz & Sayit, Kaan, 2020, Late Triassic to Early Jurassic radiolarian, conodont and ammonite assemblages from the Tavuscayiri block, Mersin Mélange, southern Turkey: Time constraints for the T / J boundary and sedimentary evolution of the southern margin of the northern Neotethys, Geodiversitas 42 (27), pp. 493-537 : 513-514

Orbiculiformella pulchra Tekin , n. sp. ( Fig. 9 A-E)

urn:lsid:zoobank.org:act:E8E435F4-3248-48C1-9600-0874A2E181F7

HOLOTYPE. — Sample Orbuk-32, HU.JMB.0134 ( Fig. 9A ).

PARATYPES. — HU.JMB.0135 ( Fig. 9B ), HU.JMB.0136 ( Fig. 9C ), HU.JMB.0137 ( Fig. 9D ), HU.JMB.0138 ( Fig. 9E ).

TYPE LOCALITY. — Orbuklukeli section, Mersin Mélange, NW of Mersin city, southern Turkey.

ETYMOLOGY. — From the Latin pulchra , beautiful, fine, due its beutiful test.

OCCURRENCE. — Lower Jurassic, lower Sinemurian of the Orbuklukeli section, Mersin Mélange, NW of Mersin city, southern Turkey.

DIMENSIONS (based on five specimens, in µm). — Diameter of cortical shell: 200-250 (holotype: 225, average: 226.2); Width of central area: 100-125 (holotype: 125, average: 110); Length of longest spine: 100-125 (holotype: 100, average: 112.5).

DESCRIPTION

Test thick, circular with relatively shallow central cavity. Test with large, polygonal (mainly tiangular) pore frames and small circular nodes at pore frame vertices.Margin of test with numerous (upto eight) peripheral spines.Peripheral spines needle-like, subcircular in transversal section, tapering distally gradually to the distal end. Usually one of them slightly longer than others.

REMARKS

This species differs from Praeorbiculiformella sp. A sensu Carter et al. (1998: 59, pl. 9, fig. 22) by possessing conical peripheral spines instead of bladed ones.

Figures

FIG. 9. — Photomicrographs of the radiolarians from the Orbuklukeli section: A-E, Orbiculiformella pulchra Tekin, n. sp.; A, Holotype, Orbuk-32; B-E, Paratypes; B, Orbuk-31; C-E, Orbuk-32; F-G, Orbiculiformella? trispina trispina (Yeh, 1987), Orbuk-32; H, Orbiculiformella sp. A, Orbuk-27; I, Danubea sp. A, Orbuk-27; J-L, Charlottea elegantissima Tekin, n. sp.; J, Orbuk-32, Holotype; K-L, Paratypes; K, Orbuk-27; L, Orbuk-32; M, N, Charlottea johnsoni Whalen & Carter in Carter, Whalen & Guex, 1998, Orbuk-32; O, Charlottea sp. A sensu Whalen & Carter (2002), Orbuk-41; P-R, Tozerium orbuklukeliense Tekin, n. sp.; P, Holotype, Orbuk-32; Q-R. Paratypes; Q, Orbuk-32; R, Orbuk-31; S-T, Tozerium sp. A; S, Orbuk-41; T, Orbuk-44; U, Ferresium sp. cf. F. teekwoonense Carter, 1993, Orbuk-15; V, Palaeosaturnalis blomei Kozur & Mostler, 1990, Orbuk-32; W, Palaeosaturnalis liassicus Kozur & Mostler, 1990, Orbuk-38; X, Palaeosaturnalis schaafi Kozur & Mostler, 1990, Orbuk-38; Y, Palaeosaturnalis subovalis Kozur & Mostler, 1990, Orbuk-38. Scale bar: A-E, 200 µm; F-H, 170 µm; I, 80 µm; J-L, P-R, 120 µm; M-O, S-U, 150 µm; W, X, 220 µm.