Stauroacanthocircus, Kozur & Mostler, 1983 emend. Kozur & Mostler, 1990

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 : 519

Stauroacanthocircus sp. A

( Fig. 10R )

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

DESCRIPTION

Shell not preserved, ring broad and elliptical. Thin ring contains eight, thin, needle-like spines. Inner cavity broad, elliptical with four thin polar spines.

REMARKS

This specimen differs from Stauroacanthocircus dickinsoni ( Yeh 1989: 50, pl. 13, fig. 18) by having a broad elliptical ring and inner cavity, and thin, short peripheral and polar spines.

Figures

FIG. 10. — Photomicrographs of the radiolarians from the Orbuklukeli section:A, Palaeosaturnalis subovalis Kozur & Mostler,1990,Orbuk-44;B, C, Mesosaturnalis artus (Donofrio & Mostler,1978), Orbuk-21;D, E, Mesosaturnalis octospinus Sugiyama,1997,Orbuk-21;F, G, Praehexasaturnalis merici Tekin,2002; F, Orbuk-46; G, Orbuk-47; H, I, Praehexasaturnalis poultoni Whalen & Carter in Carter, Whalen & Guex, 1998, Orbuk-31; J, K, Praehexasaturnalis tenuispinosus (Donofrio & Mostler, 1978); J, Orbuk-26; K, Orbuk-31; L, M, Praehexasaturnalis tetraradiatus Kozur & Mostler, 1990; L, Orbuk-31; M, Orbuk-32; N-O, Stauroacanthocircus dickinsoni (Yeh, 1989); N, Orbuk-31; O, Orbuk-47; P, Q, Stauroacanthocircus? poetschensis Kozur & Mostler, 1990, Orbuk-31; R, Stauroacanthocircus sp. A, Orbuk-32; S, T, Pseudoacanthocircus mediospinosus Kozur & Mostler, 1990; S, Orbuk-38; T, Orbuk-44; U, Pseudoacanthocircus mocki Kozur & Mostler, 1990, Orbuk-44; V, Pseudoacanthocircus troegeri Kozur & Mostler, 1990, Orbuk-44; W, Pseudoacanthocircus sp. B sensu Sugiyama (1997), Orbuk-31; X, Y, Droltus eurasiaticus Kozur & Mostler, 1990, Orbuk-32. Scale bar: A, 220 µm; B, C, 120 µm; D-G, L-P, R-V, 200 µm; H-K, W, 170 µm; Q, 240 µm; X, Y, 90 µm.