Gongylothorax sp.

Dumitrica, Paulian, Dieni, Iginio & Massari, Francesco, 2022, Valanginian Radiolarians Of Ne Sardinia (Italy) In The Frame Of The Weissert Event, Acta Palaeontologica Romaniae 18 (2), pp. 97-159 : 116

Gongylothorax sp.

Figs. 9h

Description. Dicyrtid shell with a very small cephalis partly included in a spherical thorax. Thorax globular with diameter slightly larger than the height. No sutural pore is present, but a small aperture seems to exist. Wall perforated by circular pores which are polygonally framed and partly quincuncially disposed.

Studied material. Only the illustrated specimen in OZ824 stub PD120-OZ834-R10-06 and 06a.

Dimensions. Length of test with cephalis 123 µm, diameter of thorax 126 µm.

Remarks. In the absence of the sutural pore, characteristic of the genus, and in the impossibility to see a distal aperture, the generic assignation of this species remains questionable.

Occurrence. Very rare in the upper Valanginian sample OZ824.

Figures

Fig. 9 a, b - Eucyrtidiellum sardoum Dumitrică n. sp.: a, a1 - holotype, OZ836; b - paratype, OZ839. c-e, g - Hemicryptocapsa capita Tan: c - OZ838, d - OZ824, e - OZ837, g - OZ839. f-f2 - Gongylothorax oculoporus Dumitrică n. sp.: OZ824 and OZ826. h – Gongylothorax (?) sp., OZ834. i-i2 – Gongylothorax verbeeki (Tan), OZ824; i1, i2 - details of apical and apertural parts. j, j1, j2 - Williriedellum buekkense (Kozur), OZ824: j – lateral view, j1 – apical view with sutural pore, jb – distal view. k – Arcanicapsa simplicissima Dumitrică n. sp., OZ836, k1 – distal view showing the apical rosette. l-o, t, t1, u - Kozurium hindei (Tan): l, l1 - OZ837, m - OZ839, n - OZ834, o - OZ836, t-t1 x300, OZ825, n1 – distal aperture of fig. 9n. p-s1 - Cryptamphorella alieviana Dumitrică n. sp.: p, s - OZ825, r - OZ837, s1 detail of test of fig. s. Figs. p-s x200; figs. c-e, g x250; figs. a, a1, b, f, f2, h, h1, i, k-o, t, t1, x300; i1, i2, m x400.