Napora pyramis, Dumitrica & Zügel, 2003

Dumitrica, Paulian & Zügel, Peter, 2003, Lower Tithonian mono- and dicyrtid Nassellaria (Radiolaria) from the Solnhofen area (southern Germany), Geodiversitas 25 (1), pp. 5-72 : 64

Napora pyramis n. sp. ( Fig. 29J, K )

HOLOTYPE. — Photo No. 13759; Musée de Géologie , Lausanne, No. 74418 ( Fig. 29J ).

ETYMOLOGY. — From the Latin pyramis : pyramid.

MATERIAL EXAMINED. — Four illustrated specimens of which two from the type horizon (sample Mue 22), one specimen from sample Mue 9, and another one from sample Hob 32.

DIMENSIONS ( IN µM). — Total length 175-195 (av. 185), length of apical horn 43-49 (av. 47), of cephalis 23-37 (av. 30), of thorax 45-60 (av. 55), of feet 53-61 (av. 58), total width 105-120 (av. 115), width of cephalis 38-45 (av. 41), of thorax 90-100 (av. 95).

DESCRIPTION

Test subpyramidal with a robust, apical horn. Proximal part of apical horn three-bladed; blades thick externally, broader terminally, each one with two very short thorns or only with a transversal blade; distal part conical, generally longer than the proximal part. Cephalis globular, smooth, poreless. Ventral spine very weakly marked externally. Thorax well distinguished from cephalis, subpyramidal, with four or six transverse rows of circular pores. Pores usually in square pattern distally, decreasing in size proximally and infilled toward the collar stricture. Feet usually shorter than thorax, very slightly curved, their external blade forming edges on the distal part of thorax. Velum very short when present.

REMARKS

This species is very close to Napora burckhardti from which it differs by short and rather straight feet and a pyramidal thorax. From N. pyramidalis Baumgartner, 1984 it differs in having a distinct smooth cephalis and a pronounced collar stricture because of the sudden inflation of the thorax.

Figures

FIG. 29. — A, B, Napora lomoalta Hull, 1997; A, right lateral view; B, view from Ll; C, D, Napora matsuokai n. sp.; C, holotype, left lateral view; D, paratype, left lateral view; E-G, Napora modesta n. sp.; E, holotype, dorsal view; F, G, paratypes; F, dorsal view; G, view from Lr; H, I, Napora pacifica Kiessling, 1999; H, view from Ll; I, view from Lr; J, K, Napora pyramis n. sp.; J, holotype; K, paratype; L-N, Napora schaudibergensis n. sp.; L, M, paratypes; L, dorsal view; M, view from Ll; N, holotype, view from Lr; O, Napora sp., left lateral view. Abbreviations: Ll, left primary lateral spine; Lr, right primary lateral spine. Scale bars: A, H, I, M, N, 100 µm; B-G, J-L, O, 30 µm.