Pantanellium giganteum 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 : 506

Pantanellium giganteum Tekin , n. sp.

( Fig. 6 K-O)

urn:lsid:zoobank.org:act:5BAC0A8A-3218-48FA-8EB3-E2EEF99333A4

HOLOTYPE. — Sample Orbuk-26, HU.JMB.0106 ( Fig. 6K ).

PARATYPES. — HU.JMB.0107 ( Fig. 6L ), HU.JMB.0108 ( Fig. 6M ). HU.JMB.0109 ( Fig. 6N ), HU.JMB.0110 ( Fig. 6O ).

TYPE LOCALITY. — Orbuklukeli section, Mersin Mélange, NW of Mersin city, southern Turkey.

ETYMOLOGY. — From the Latin giganteum , giant, due to its big size.

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

DIMENSIONS (basedonfivespecimens,inµm). — Diameterofthecortical shell along spines: 83-120 (holotype: 120, average: 110.5); Diameter of the cortical shell perpendicular to spines: 110-133 (holotype: 110, average:117.1); Length of shorter spine: 50-90 (holotype:80, average: 74.6); Length of longer spine: 120-166 (holotype: 140, average: 147).

DESCRIPTION

Cortical shell large, sphaerical to subsphaerical with large pentagonal and hexagonal pore frames. Pore frames with rounded to subrounded nodes at pore frame vertices. Six to seven pore frames visible both along primary spines and perpendicular to primary spines. Polar spines unequal, three-bladed with rounded, longitudinal ridges and relatively narrow grooves. One polar spine about twice longer than the other polar spine and longer polar spine slightly dextrally twisted.

REMARKS

This species differs from P. freboldi ( Carter et al. 1998: 48, pl. 1, figs 17, 21, 27) by having unequal and slightly dextrally twisted polar spines. It differs also from P. sixi Whalen & Carter in Carter, Whalen & Guex, 1998 ( Carter et al. 1998: 48) by possessing a larger cortical shell and longer, slightly dextrally twisted polar spines in many cases.

Figures

FIG. 6. — Photomicrographs of the radiolarians from the Orbuklukeli section: A, Betraccium kennecottense Carter, 1993, Orbuk-15; B, Betraccium perilense Carter, 1993, Orbuk-15; C, D, Gorgansium alpinum Kozur & Mostler, 1990, Orbuk-32; E, F, Gorgansium gongyloideum Kishida & Hisada, 1985, Orbuk-41; G, Pantanellium fosteri Pessagno & Blome,1980, Orbuk-15; H-J, Pantanellium freboldi Whalen & Carter in Carter,Whalen & Guex,1998;H-I, Orbuk-27; J, Orbuk-31; K-O, Pantanellium giganteum Tekin, n. sp.; K, Holotype, Orbuk-26; L-O, Paratypes; L, Orbuk-26; M, Orbuk-27; N-O, Orbuk-31; P, Pantanellium kluense Pessagno & Blome, 1980, Orbuk-26; Q, R, Pantanellium tanuense Pessagno & Blome,1980; Q, Orbuk-26; R, Orbuk-27; S-U, Novamuria impensa (Whalen & Carter in