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 Author Tekin, Kagan Author Krystyn, Leopold Author Okuyucu, Cengiz Author Bedi, Yavuz Author Sayit, Kaan text Geodiversitas 2020 2020-11-26 42 27 493 537 journal article 8503 10.5252/geodiversitas2020v42a27 20141273-3452-4388-b6a8-aab9193c87fe 1638-9395 4447758 urn:lsid:zoobank.org:pub:1A437774-B5BE-49F2-8DEF-D46F2790484A Farcus sp. B ( Fig. 12V ) OCCURRENCE. — Lower Jurassic, lower Sinemurian of the Mersin Mélange, NW of Mersin city, southern Turkey . DESCRIPTION Tets long, dicyrtid with hemisphaerical cephalis. Cephalis mainly poreless/with rare pores and a long, needle-like, distally tapering horn. Collar stricture marked by a slight depression. Thorax truncated pyramidal in outline with scattered, subcircular pores, in some cases pores aligned in vertical rows. Thorax terminated in a short tube with scattered and subcircular pores. Four feet long, needle-like and decreasing in width distally. REMARKS This specimen differs from Farcus priscus Yeh & Cheng (1998: 24 , pl. 5, figs 1, 6, 12) by possessing a long, pyramidal test, few pores at the surface of thorax, longer, prominent tube at the end of thorax and longer feet.