Anaticapitula tenera, 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 : 56-57

Anaticapitula tenera n. sp. ( Fig. 27 G-J)

HOLOTYPE. — Photo No. 45668; stub Mue 22/16; Musée de Géologie , Lausanne, No. 74410 ( Fig. 27G ). ETYMOLOGY. — From the Latin tenerus: young.

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

DIMENSIONS ( IN µM). — Total length 240-280 (av. 260), total width 135-155 (av. 145), length of apical horn 60-80 (av. 75), of feet 110-125 (av. 115), width of cephalis 65-85 (av. 70), of terminal tube 60-80 (av. 70).

DESCRIPTION

Test consisting of cephalis and cylindrical thorax. Cephalis globular with a robust, three-bladed apical horn and three curved three-bladed feet. Initial spicule as described for the genus, with Lr, Ll, and D prolonged into the three feet, and V and lr and ll expressed outside test wall as three pointed nodes situated approximately at the middle height of cephalis or a little above, between the feet. Arches Al, AV, Dl, Ll, and LV of the initial skeleton expressed outside test wall by ridges. Apical horn slightly subaxial, pointed distally, with broad blades, each blade united at the surface of cephalic wall with one of the three pointed nodes marking the arches Al and AV. Feet equal, longer than apical horn, divergent proximally and strongly curved distally. They are three-bladed, one blade external and usually united with one of the pointed nodes, the other two blades lateral. At the inner side their axis makes a pair of larger pores in the proximity of the arches. Cephalic wall with more or less regular and pronounced ridges and pores very small, scattered in the depressions among ridges. Thorax velum-like, thin-walled, attached to cephalis and feet proximally, free distally and tubular with rounded triangular cross-section. Pores of this segment very small, dense and irregularly distributed.

REMARKS

Anaticapitula tenera n. gen., n. sp. is very close to Jacus (?) anatiformis from which it differs by having longer, curved feet. From A. germanica n. gen., n. sp. it differs by having curved feet and well marked arches on the surface of cephalis. By these arches it resembles the Triassic species of the genus Eonapora Kozur & Mostler, 1979 . Jacus (?) italicus Jud, 1994 and Jacus (?) sp. aff. J.(?) italicus of Matsuoka (1998) are also close to this species from which they differ in having shorter, sturdier feet.

Figures

FIG. 27. — A, B, K, Anaticapitula clauda n. gen., n. sp.; A, holotype, left lateral view; B, K, paratypes; B, right latero-dorsal view; K, basal view showing initial cephalic structure, note thin Ax; C, D, Anaticapitula germanica n. gen., n. sp.; C, holotype, right lateral view; D, paratype, view from Ll; E, F, Anaticapitula pennata n. gen., n. sp.; E, holotype, view from Lr; F, paratype, ventral to right lateral view; G-J, Anaticapitula tenera n. gen., n. sp.; G, holotype, view from Ll; H-J, paratypes; H, basal view, note Ax in the centre; I, ventral view; J, view from Ll. Abbreviations: Ax, axial spine; Ll, left primary lateral spine; Lr, right primary lateral spine. Scale bars: A-H, I, J, 30 µm; K, 10 µm.