Udalia infrequens Tekin, 2020

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 : 509

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 .

Figures

FIG. 7. — Photomicrographs of the radiolarians from the Orbuklukeli section:A-D, Praeudalia rhaeticaTekin, n. gen.,n. sp.; A, Holotype,Orbuk-15;B-D, Paratypes, Orbuk-15; E, Udalia dennisoni Whalen & Carter in Carter, Whalen & Guex, 1998, Orbuk-32; F-G, Udalia infrequens Tekin, n. sp.; F, Holotype, Orbuk-36; G, Paratype, Orbuk-36; H-J, Udalia primaeva Whalen & Carter in Carter, Whalen & Guex, 1998, Orbuk-27; K-M, Thurstonia gibsoni Whalen & Carter in Carter, Whalen & Guex, 1998, Orbuk-26; N, Thurstonia minutaglobus Whalen & Carter in Carter, Whalen & Guex, 1998, Orbuk-32; O, Thurstonia timberensis Whalen & Carter in