Napora timida, 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 : 65

Napora timida n. sp. ( Fig. 30A, B )

HOLOTYPE. — Photo No. 54922; stub Mue 22/17; Musée de Géologie , Lausanne, No. 74420 ( Fig. 30A ). ETYMOLOGY. — From the Latin timidus: shy, because of its hidden cephalis.

MATERIAL EXAMINED. — Five specimens from the type horizon (sample Mue 22).

DIMENSIONS ( IN µM). — Total length 350-395 (av. 370), length of apical horn 35-50 (av. 40), of cephalothorax 135-140 (av. 138), of velum 65-100, of feet 175-195 (av. 185), total width 230-260 (av. 250), width of thorax 165-175 (av. 170).

DESCRIPTION

Test bell-shaped with cephalis hidden in the thoracic wall and cavity. Due to this position of the cephalis the slightly pyramidal ventral spine seems to originate in the upper part of thorax. Apical horn short, thin by comparison to the shell, three-bladed, with truncated, expanding blades distally and a central thorn, together forming a crown-like structure. Thorax thick-walled, robust, large hexagonal and pentagonal pore frames with vertices strengthened by small nodes. Pores alternately arranged in five to six transversal rows. Feet robust, diverging proximally and curving inward distally. Outer blades of feet broader than lateral blades. Thoracic velum finely porous, thin-walled, connected to thoracic aperture and to the proximal part of the feet by numerous fine bars. Aperture of the velum wide open, triangular.

REMARKS

The specimens from Mue 22 are morphologically very close to N. collieri Hull, 1997 by having the blades of the apical horn extended on the surface of cephalis up to the proximal end of thorax, a comparable apical horn and curved feet, but differ by the external blade being broad- er, thorax less rounded, apical horn thinner, and cephalis hidden in the thorax. By their broad external blade the feet of our specimens resemble those of N. latissima Takemura, 1986 and N. triangularis .

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.