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 Tozerium sp. A ( Fig. 9S, T ) OCCURRENCE. — Lower Jurassic, lower Lower Pliensbachian of Orbuklukeli section, Mersin Mélange, NW of Mersin city, southern Turkey . DESCRIPTION Cortical shell small, subsphaerical with four strong spines. It composed of small, polygonal pore frames (mainly triangular) with small, circular nodes at pore frame vertices. Primary spines tetrahedrally disposed, strong, tricarinate with prominent ridges and shallow grooves. They are slightly decreasing in width distally and very slightly dextrally twisted. REMARKS This taxon differs from Tozerium orbuklukeliense Tekin , n. sp. by having tricarinate and slightly dextrally twisted spines instead of needle-like spines.