Poculinapora tripartita, 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 : 70

Poculinapora tripartita n. sp. ( Figs 30C ; 32B )

HOLOTYPE. — Photo No. 30851; stub Mue 22/3; Musée de Géologie , Lausanne, No. 74423 ( Figs 30C ; 32B ).

ETYMOLOGY. — From the Latin tripartitus: having three parts, divided into three.

MATERIAL EXAMINED. — One specimen from the type horizon (sample Mue 22).

DIMENSIONS ( IN µM). — Total length 437, length of apical horn from base to the verticils of spines 72, of cephalis 37, of thorax 75, of velum 95, of feet 200-230, diametre of cephalis 50, of thorax 110, of velum 130.

DESCRIPTION

Cephalis small, globular with a pustulate surface. Apical horn long, three-bladed, increasing in width distally, and divided into three straight, long, strongly divergent, three-bladed spines lying in the planes of the blades of the horn. One blade of these distal spines continues one of the blades of the apical horn, the other two connect two blades of the other two spines forming an inverted pyramidal or conical cavity. This cavity seems to be divided, at least distally, into three compartments by three longitudinal septa or radial bars radiating from the axis of the horn toward the interradial zones. Ventral spine very short externally. Collar suture well marked externally by a constriction and the absence of pustules. Thorax globular, subhemispherical, with the distal part slightly constricted, and with very small, circular pores. Surface of thorax rough, pustulate or spiny. Feet long, three-bladed, slightly divergent, and slightly curved inward. Velum very delicate, about as long as thorax, and connected on almost its whole length to the lateral blades of the feet. It has quadrangular or triangular meshes aligned usually in transverse rows.

REMARKS

This new species, from which we have only one specimen, resembles Napora aranea n. sp. and N. pacifica in having a similar cephalis and thorax, but differs from them in having the feet slightly curved inward and especially in having the apical horn with the structure as described above.

Figures

FIG. 30. — A, B, Napora timida n. sp.; A, holotype, view from Lr; B, paratype, view from Lr; C, Poculinapora tripartita n. gen., n. sp., holotype, view from Lr; D, E, Poculinapora marsupialia n. gen., n. sp; D, holotype, view from Ll; E, paratype, dorsal view; F-I, Poculinapora poculigera n. gen., n. sp.; F, I, holotype, view from Lr and detail of apical horn; G, H, paratype, view from Lr and detail of apical horn in subapical view. Abbreviations: Ll, left primary lateral spine; Lr, right primary lateral spine. Scale bars: A-G, 100 µm; H, 30 µm; I, 10 µm.

FIG. 32. — Apical horns of Poculinapora n. gen.; A, P. espinosa n. comb., right lateral view; B, P. tripartita n. gen., n. sp., holotype, right lateral view; C, E, P. spathulipes n. gen., n. sp., holotype and paratype in left lateral and right lateral views respectively; D, P. poculigera n. gen., n. sp., paratype, left lateral view; F, P. marsupiala n. gen., n. sp., paratype, left lateral view. All arrows point to the opening of the tube along the apical horn. Scale bar: 0.1 mm.