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 10.5252/geodiversitas2020v42a27 20141273-3452-4388-b6a8-aab9193c87fe 1638-9395 4447758 urn:lsid:zoobank.org:pub:1A437774-B5BE-49F2-8DEF-D46F2790484A Udalia infrequens Tekin , n. sp. ( Fig. 7F, G ) urn:lsid:zoobank.org:act: 494233BE-DDCB-4D94-A544-572EEF1D94A0 HOLOTYPE . — Sample Orbuk-36, HU.JMB.0118 ( Fig. 7F ). TYPE LOCALITY . — Orbuklukeli section, Mersin Mélange, NW of Mersin city, southern Turkey . ETYMOLOGY. — From the Latin: infrequens : rare, due its rare occurrence. OCCURRENCE. — Lower Jurassic, lower Pliensbachian of the Orbuklukeli section, Mersin Mélange, NW of Mersin city, southern Turkey . PARATYPE . — HU.JMB.0119 ( Fig. 7G ). DIMENSIONS (based on two specimens, inµm). — Maximum diameter of cortical shell: 100-110 ( holotype : 110, average: 105); Length of longest spine: 80-100 ( holotype : 100, average: 90). DESCRIPTION Cortical shell small, subrectangular with subplaniform upper and lower surfaces. Outer pore meshwork with triangular to tetragonal pore frames and large nodes at pore frame vertices. Four, needle-like, distally tapering spines situated at each corner and terminated with a sharp end. Length of spines slighly shorter than diameter of the cortical shell. REMARKS This species differs from Udalia primaeva ( Carter et al. 1998: 60 , pl. 6, figs 8, 12, 15, 16, 20, 23) by possessing larger pore frames on the cortical shell and large nodes at pore frame vertices. Although inner structure of this species is unknown, as specimens have needle-like spines, this species is included to Udalia instead of Emiluvia Foreman, 1973 .