Danubea

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 : 514

Danubea sp. A

( Fig. 9I )

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

DESCRIPTION

Test large with inflated cortical shell and two polar spines. Cortical shell sphaerical with triangular and tetragonal pore frames. Small nodes present at pore frame vertices. Spines unequal in length, needle-like, circular in transversal section and tapering gradually to the distal end.

REMARKS

This specimen differs from Danubea howardi Whalen & Carter in Carter et al. (1998: 40-41 , pl. 5, figs 2-4, 14, 18) by having an ellipsoidal test in the direction of polar spines and needle-like spines instead of tricarinate 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.