Humerocyrtis jekeli, 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 : 68

Humerocyrtis jekeli n. sp.

Figs. 6d , 8c

Diagnosis. Shell bell-shaped consisting of a small, pear-shaped cephalic cavity and practically poreles cephalis and a thorax with concave distal portion. Apical horn, long, three-bladed and pointed. Ventral spine small, three-bladed and pointed. Proximal part of thorax very short, wide-conical with rare small circular or oval pores. Shoulder relatively well remarked and rounded. Distal part of thorax subcylindrical with concave outline, its distal end simple or bearing a short and narrower thin-walled additional shell. Pores of thorax circular or oval, of variable sizes and arranged irregularly or in oblique rows.

Studied material. Two specimens in sample Rc4.

Holotype. Fig. 8c , sample Rc2, coll. MGL.110286.

Paratype. Fig. 6d , sample Rc4, coll. MGL .110287.

Dimensions. Maximum length of shell with apical horn 126-144 µm, without horn 87-96 µm, of cephalis 30-35 µm, of thorax 52-61 µm, diameter of cephalis 37-38 µm, of shoulder 57-58 µm, of distal end 95-106 µm.

Etymology. The species is dedicated to the geologist E. Jekelius who, at the beginning of the XXth century, studied the geology and Triassic fauna from the Braşov and Cristian areas.

Remarks. To this species I assigned provisionally two rather different specimens. The paratype differs from the holotype by having a longer and slightly pear-shaped cephalis, very irregularly arranged pores on thorax and distal border of thorax practically without the thin additional shell. There is just a beginning of such a shell in the left side of the distal border.

Stratigraphic range. Buchenstein Formation, Recoaro, lower Ladinian.

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.

Fig. 8. a. – Humerocyrtis contraria n. sp., holotype, Rc4; b. – Humerocyrtis conica n. sp., holotype, Rc4. c. – Humerocyrtis jekeli n. sp., holotype, Rc2; e,?d.– Humerocyrtis undulata n. sp., Rc4: e – holotype. f – Humerocyrtis lahmi n. sp., holotype, Rc4. Scale bar of 50 µm is for all figures.