Tetrapaurinella sphaerica 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

Tetrapaurinella sphaerica Tekin , n. sp. ( Fig. 8 P-V)

urn:lsid:zoobank.org:act:C4E6F19D-A746-43DA-9A55-5480C9F33969

HOLOTYPE. — Sample Orbuk-32, HU.JMB.0127 ( Fig. 8P ).

PARATYPES. — HU.JMB.0128 ( Fig. 8Q ), HU.JMB.0129 ( Fig. 8R ), HU.JMB.0130 ( Fig. 8S ), HU.JMB.0131 ( Fig. 8T ), HU.JMB.0132 ( Fig. 8U ), HU.JMB.0133 ( Fig. 8V ).

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

ETYMOLOGY. — Due its sphaerical cortical shell.

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

DIMENSIONS (based on seven specimens, in µm).- Maximum diameter of test: 100-140 (holotype: 138, average: 123.3); Length of the longest spine: 80-100 (holotype: 100, average: 93).

DESCRIPTION

Shell flat to slightly inflated, spongy consisting of several layers around the micropshaere and four primary spines at right angles situated in one plane or, sometimes, slightly inclined ( Fig. 8P ). Surface of the shell with numerous pores of different size. Primary spines needle-like, subcircular in transverse section, slightly gradually tapering, and pointed.

REMARKS

This species differs from the Triassic species Tetrapaurinella latispinosa Kozur & Mostler (1994: 77 , pl. 16, fig. 9; pl. 17, figs 4, 6) by possessing a much smaller shell by comparison with primary spines and slightly larger pores.

Figures

FIG. 8. — Photomicrographs of the radiolarians from the Orbuklukeli section; A-H, Acanthotetrapaurinella kennecottensis (Carter in Longridge, Carter, Smith & Tipper, 2007); A-E, G, Orbuk-26, F, H, Orbuk-27; I-O, Paurinella liassica Tekin, n. sp.; I, Holotype, Orbuk-27; J-O, Paratypes; J, N, Orbuk-27; K-M, Orbuk-32; O, Orbuk-26; P-V, Tetrapaurinella sphaerica Tekin, n. sp.; P, Holotype, Orbuk-32; Q-V, Paratypes; Q, Orbuk-32; R-T, Orbuk-27, U, Orbuk-26; V, Orbuk-31; W-Y, Orbiculiformella callosa (Yeh, 1987); W, X, Orbuk-36; Y, Orbuk-41. Scale bar: G-H, 100 µm; A-F, I-V, 150 µm; W-Y, 200 µm.