Gorispela hungarica, 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 : 59-60

Gorispela hungarica n. sp.

Figs. 3 c-e

Diagnosis. Shell bell-shaped, conical bearing two or three circumferential ridges. Cephalis with robust and hollow conical apical and ventral horns. Its wall imperforated or with sparse rounded small pores of various sizes and irregular dispositions. Apical horn in axial position, its distal end with a few short spinules or irregular surface. Ventral horn in horizontal or subhorizontal position, its distal end three-bladed, blades thick or practically absent, and with irregular surface. Initial spicule with distal ends of apical and ventral rays attached to the inner surface of horns. Thorax truncate conical, bearing two or three circumferential ridges, its wall with irregularly distributed pores of various forms, from circular to oval or triangular. Size of pores increases from the proximal to the distal part. Distal end represented by an imperforate band. Collar boundary not marked by a change in shape but considered to be above the level of the first circumferential ridge.

Studied material. Three illustrated specimens from the sample FÖ 87.

Holotype. Fig. 3e , coll. MGL.110274.

Dimensions. Length of shell with apical horn 155-160 µm, without horn 100 µm, of apical horn 50-60 µm, of ventral horn 40-45 µm; diameter of horns at base 20-25 µm, of base of thorax 108 µm.

Variability. The three illustrated specimens, the only ones found in the Felsőörs sample, prove that the variability of the species is visible especially in the number of circumferential rings and, depending on their number, the distance between them because the size of shell remains rather constant.

Etymology. From its occurrence in Hungary.

Remarks. Gorispela hungarica n. sp. resembles Gorispela fenestrata n. sp. by having a rather similar shape, but differs by having the apical horn in axial position, the ventral horn in horizontal position, and by not having two distal bands. It differs also by the position of the ventral ray of the initial spicule, that has not a central position in the ventral horn but it is connected to the lower side of its inner wall. It is interesting to mention that the same types of spinules present on the distal part of the apical horn of the three specimens have been remarked in the same position on the holotypes of the species Gorispela mimetica n. sp. (see below) and Silicotinntinabulum formosum n. sp., two species occurring in the same sample (case of horizontal gene transfer?).

Stratigraphic range. Late Anisian (Illyrian) of Hungary.

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.