Farcus, Pessagno, Whalen & Yeh, 1986

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 : 526

Farcus sp. A

( Fig. 12T, U )

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

DESCRIPTION

Test dicyrtid with short feet. Cephalis hemisphaerical with very rare, scatted pores and a tricarinate distally contracting horn. Horn with prominent ridges, deep furrows and a sharp end. Collar stricture not marked externally. Thorax large, distally expanding and with a smooth surface with scattered, subcircular pores of different sizes. Base of the thorax with four short and tricarinate feet.

REMARKS

This taxon differs from Farcus graylockensis ( Pessagno et al. 1986: 24, pl. 2, figs 4, 6-8, 12, 15) by possessing a smaller test, indistinct collar stricture, thorax with smooth surface, scattered pores and very short feet.

Figures

FIG. 12. — Photomicrographs of the radiolarians from the Orbuklukeli section; A, B, Canoptum rhaeticum Kozur & Mostler,1981, Orbuk-15;C, Canoptum striatum (Kozur & Mostler, 1990), Orbuk-27; D-J, Laxtorum breve Tekin, n. sp.; D, Holotype, Orbuk-32; E-J, Paratypes, Orbuk-32; K-L, Laxtorum obscurum Tekin, n. sp., K, Holotype, Orbuk-27; L, Paratype, Orbuk-27; M-N, Atalantria emmela (Cordey & Carter, 1996), Orbuk-32; O, Atalantria sp. A, Orbuk-27; P-Q, Pseudoeucyrtis