Humerocyrtis superba, 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 : 65

Humerocyrtis superba n. sp.

Fig. 6c

Diagnosis. Shell large, bell-shaped with the body divided into two parts by a median circumferential ridge corresponding to the maximum diameter of the shoulder: a proximal part and a distal part. Proximal part conical with concave lateral sides consisting of cephalis and the proximal part of the thorax. Cephalis hemisphaerical bearing two three-bladed horns: an apical horn and a ventral horn, both pointed and having thin but wide blades. Apical horn dorsally tilted. Cephalic wall perforated by very small circular or subcircular and irregularly arranged pores. Thorax of this part of shell wide conical with concave outline. It has much larger and irregularly arranged pores. Shoulder sharp and angular. Distal part of thorax much larger and longer than the proximal part, its outline concave and distal end flared. Pores of this part arranged in 6 circumferential intercalary rows of three types of shapes and sizes: first two rows consisting of smaller circular, oval or elliptical pores, following two rows consisting of very large rounded rectangular or oval pores with long axes longitudinally positioned, and last two rows with elliptical pores arranged with long axes transversally directed. Each row of such thoracic pores consisting of 10-11 pores on half the perimeter.

Studied material. One specimen in the sample BV 85-70.

Holotype. Fig. 6c , sample BV 85-70, coll. MGL.110284.

Dimensions. Length of shell without apical horn 155 µm, with apical horn 210 µm, length of shell up to the circumferential ring 70 µm, of distal part 85 µm, diameter of cephalis 50 µm, of shoulder or circumferential ring 110 µm, of distal end 160 µm.

Etymology. From the Latin superbus, - a, - um – superb.

Remarks. This species differs from other species of this genus by its great size and, especially, the different types and arrangement of pores on the distal part of thorax.

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.