Gorispela bragini, 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 : 62

Gorispela bragini n. sp.

Figs. 4h, 5c

Diagnosis. Shell bell-shaped with practically poreles cephalis. Apical horn slightly tilted dorsally, pointed, hollow on the proximal portion and slightly three-bladed on the distal one. Ventral horn three-bladed and pyramidal arising directly from the cephalis without a conical intermediary portion. Ventral ray of initial spicule connected with the centre of the horn. Collar boundary marked by a slight constriction. Thorax thin-walled, truncate conical and bearing 2-3 circumferential ridges bearing in the interridge areas a row of circular, oval or rectangular windows. Distal end with a very narrow and vertically directed circumferential band.

Studied material. Three specimens in sample Rc4.

Holotype. The illustrated specimen, sample Rc4, coll. MGL.110278.

Dimensions (measured only on holotype). Length of shell with apical horn 130 µm, length of horn 60 µm, of cephalis 47 µm, of thorax 48 µm, diameter of cephalis 48 µm, of thorax 85 µm.

Etymology. The species is dedicated to Dr. Nikita Bragin for his contribution to the knowledge of Triassic radiolarians.

Remarks. By its morphology, this species resembles Gorispela fenestrata n. sp., from which it differs by being smaller and by not having the intermediary conical hollow portion between the distal three-bladed part of the ventral horn and the cephalic cavity.

Stratigraphic range. Buchenstein Formation, lower Ladinian (Fassanian).

Figures

Fig. 5. a, b. – Gorispela tuba n. sp., a. – Rc4, b. – holotype, FÖ 87; c. – Gorispela bragini n. sp., holotype, Rc4 (see also fig. 3h); d-f. – Pozsvartia multicingulata n. sp., d. – holotype, FÖ 87, e. – CRH, f. – CR25, D – dorsal spine. Scale bar of 50 µm is for all figures.