Napora divaricata, 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 : 61

Napora divaricata n. sp. ( Fig. 28L, M )

Napora sp. aff. N. latissima – Hull 1997: 118, pl. 45, figs 6, 22.

HOLOTYPE. — Photo No. 60035, 60036; stub Mue 22/23; Musée de Géologie , Lausanne, No. 74415 ( Fig. 28L, M ).

ETYMOLOGY. — From the Latin divaricatus: straddled. MATERIAL EXAMINED. — One specimen from the type horizon (sample Mue 22).

DIMENSIONS (IN µM). — Length of apical horn 40-45, of cephalis 20-45, of thorax 50-70, of feet more than 80-90; diametre of cephalis 33-40, of thorax 100-130 (dimensions based on holotype and the specimen illustrated by Hull [1997], from sample SM-48, Tithonian , Stanley Mt.) .

OCCURRENCE. — Lower Tithonian, Hybonotum Zone from Solnhofen area, Germany, upper lower to upper Tithonian, Stanley Mountain, California.

DESCRIPTION

Cephalis bulbous, imperforate with a slender apical horn bearing three subsidiary spines and a short distal horn. Ventral spine short, bladed, at the base of cephalis. Thorax wide, short pyramidal with three to four transverse rows of wide alternate pores separated by transversal costae on the middle and distal parts, and small, irregularly arranged pores on the proximal part. Feet wide diverging, curved, slender, about as long as thorax.

REMARKS

The specimen from our material resembles rather perfectly the Tithonian specimen illustrated by Hull from which it only differs by having a long- er apical horn.

Figures

FIG. 28. — A, B, Napora aranea n. sp.; A, holotype, view from Ll; B, paratype, dorsal view; C-E, Napora avirostrum n. sp.; C, holotype, view from Lr; D, E, paratypes; D, dorsal view; E, view from Lr; F, G, Napora bondoca n. sp.; F, holotype, view from Ll; G, paratype, view from Ll; H, Napora burckhardti Pessagno, Whalen & Yeh, 1986, dorsal view; I-K, Napora cristata n. sp.; I, holotype, right lateral view; J, K, paratypes; J, right lateral view; K, view from Ll; L, M, Napora divaricata n. sp., holotype, ventral and basal views. Abbreviations: Ll, left primary lateral spine; Lr, right primary lateral spine. Scale bars: A-E, H, K, 100 µm; F, G, I, J, L, M, 30 µm.