Gorispela, Dumitrică, 2024

Dumitrică, Paulian, 2024, New Middle Triassic Bell-Shaped Nassellarian Radiolaria From Alpine And Carpathian Areas, Acta Palaeontologica Romaniae 20 (1), pp. 51-75 : 63

Gorispela (?) triangulocephalis n. sp.

Figs. 6a, b

Diagnosis. Shell conical with long, straight and robust apical and ventral horns. Both horns massive but with cephalic cavity extended on a relatively short distance along them forming, in lateral view, a triangular cephalic cavity. Apical horn tilted dorsally, cylindrical in the proximal half and slightly three-bladed or with dorsal side with irregular outline on the distal half. Ventral horn subcylindrical on the proximal half and slightly three-bladed and conical on the distal half. Three-bladed morphology not expressed in forming blades but in the position of very short spines of the holotype. Initial spicule with dorsal ray prolonged outside into a very small spine. Cephalis imperforate on the upper part but with some sparse circular or oval pores on its distal half. In lateral view its cavity is practically triangular, a shape bordered by the top of the cephalis and the apical and ventral rays. Thorax subcylindrical with two or three circumferential ridges and irregularly distributed pores of circular or oval shapes in the interridged spaces.

Distal end with a narrow circumferential band.

Sudied material. Five specimens in the sample FÖ 87, Felsőörs , Hungary .

Holotype. Fig. 6b , coll. MGL.110281.

Paratype. Fig. 6a , coll. MGL .110282.

Dimensions. Length of shell without apical horn 90 µm, of apical horn 68-70 µm, of ventral horn 70-75, maximum diameter of thorax 70 µm.

Etymology. From the triangular shape of the cephalic cavity.

Remarks. Although the apical and ventral horns are very thick, which is a common character of the genus Gorispela n. gen., this species is questionably assigned to this genus due to the presence of the dorsal ray in the initial spicule and of the absence of a true hollow structure of the two horns (see also chapter 3b). As the images show, only the proximal parts of the two horns have a conical hollow portion, the result being the triangular shape of the cephalic cavity due to the prolongation of the cephalic cavity in the short conical hollow portion of the horns.

Stratigraphic range. Upper Anisian (Illyrian), Felsőörs, Balaton Highland, Hungary.

Figures

Fig. 6. a, b. – Gorispela (?) triangulocephalis n. sp., FÖ 87: a. – specimen showing internal structure, b. – holotype, D – dorsal ray. c. – Humerocyrtis superba n. sp., holotype, BV 85-70; 6d, 6c. – Humerocyrtis jekeli n. sp., Rc4, 6c. – holotype, d. - paratype; e. – Humerocyrtis deweveri n. sp., holotype, BW 85-70; f. – Humerocyrtis problematica n. sp., holotype, Rc4. Scale bar of 50 µm is for all figures.