Napora schaudibergensis, 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 schaudibergensis n. sp. ( Fig. 29 L-N)

HOLOTYPE. — Photo No. 27809; stub Mue 22/1; Musée de Géologie , Lausanne, No. 74419 ( Fig. 29N ). ETYMOLOGY. — From the Schaudiberg quarry, type locality of the species.

MATERIAL EXAMINED. — 14 illustrated specimens from the type horizon (sample Mue 22) and one illustrated specimen from sample Hob 32.

DIMENSIONS ( IN µM). — Total length 205-285 (av. 245), length of apical horn 36-56 (av. 45), of cephalothorax 65-100 (av. 75), of feet 100-145 (av. 120), total width 113-162 (av. 132), width of thorax 70-120 (av. 88).

DESCRIPTION

Cephalis small, weakly marked, practically imperforate. Apical horn very robust, short, three-bladed proximally with wide, externally expanded, rounded ridges and deep, narrow grooves. Distally it terminates into a conical or pyramidal axial spine which is as long as or long- er than proximal, bladed part. At the boundary between the two parts the blades may develop a crown of very short subsidiary spines, usually two or three for each blade, or a transversal blade. Ventral spine well developed externally, bladed, pyramidal, arising from the collar stricture. Thorax robust, hemispherical to conical with five transverse rows of pores. Pores quadrangularly to hexagonally framed, intervening bars thick with nodes at vertices. Feet long, slightly diverging and inwardly curved, commonly twice as long as to three times longer than thorax. Velum usually preserved, well differentiated from thorax by its delicate wall with transverse rows of pores. Distal part of velum well marked by a rim, three-lobate.

REMARKS

Napora schaudibergensis n. sp. is morphologically very close to Napora parva Takemura, 1986 and N. triangularis Takemura, 1986 from which it differs by having a shorter and more robust apical horn with thickened blades and deep, narrow grooves, cephalis better marked, thorax more robust. From N. timida n. sp. it differs by a less robust and more conical thorax, a more robust apical horn with longer distal spine, and a better marked cephalis. A species very close to this species is N. avirostrum n. sp. from which it differs by less divergent feet, much more robust proximal portion of apical horn, and slightly longer distal portion.

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.