Gorispela mimetica, 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 : 60-61

Gorispela mimetica n. sp.

Fig. 4b

Diagnosis. Shell conical, bell-shaped with robust, conical and hollow apical and ventral horns. Apical horn practically axial bearing a few distal spinules on its distal end, whereas the ventral one has no spinules and is horizontally positioned. Both horns have also one or two large pores on the distal end of their hollow portion. Cephalis poreless except its distal part that has a series of small circular and irregularly disposed pores. Thorax truncate conical with pores that increase rapidly in diameter towards the distal end. This end has a protruding distal circumferential ring and a vertically positioned and thin distal girdle.

Studied material. A single specimen in sample FÖ 87, Felsőörs, Hungary.

Holotype. The specimen from Fig. 3b , coll. MGL.110276.

Dimensions. Length of shell with apical horn 138 µm, without apical horn 92 µm, diameter of cephalis 43 µm, of distal ridge 126 µm.

Etymology. Due to its thorax, the morphology of which resembles perfectly that of the thorax of Silicotinntinabulum formosum n. sp. occurring in the same sample.

Remarks. This species combines the morphology of two species assigned to two coeval genera: Silicotinntinabulum formosum n. sp. and species of the genus Gorispela due the presence of a robust and long ventral horn. From the former species it has the cephalis without dorsal (D) ray, and the ventral horn and thorax completely similar; from the genus Gorispela it has the same type of ventral horn. Moreover, its apical horn has short spinules at the distal end similar to the specimen of the species Silicotinntinabulum formosum n. sp. occurring in the same fauna of the sample FÖ 87 from Felsőörs (horizontal gene transfer?). What differs is the apical horn that is not three-bladed, as in S. formosum , but conical and hollow.

Stratigraphic range. Late Anisian (Illyrian).

Figures

Fig. 3. a, a1. – Gorispela cornubovis n. sp., holotype in lateral and basal views, respectively, Rc4; b. – Gorispela fenestrata n. sp., holotype in lateral view, BV 85-70; c-e.– Gorispela hungarica n. sp., FÖ 87, e.– holotype. Scale bar of 50 µm is for all figures.