Anaticapitula germanica, 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 : 54-56

Anaticapitula germanica n. sp. ( Fig. 27C, D )

HOLOTYPE. — Photo No. 34989; stub Mue 22/6; Musée de Géologie , Lausanne, No. 74408 ( Fig. 27C ). ETYMOLOGY. — From its German type locality.

MATERIAL EXAMINED. — 11 illustrated specimens from the type horizon (sample Mue 22).

DIMENSIONS ( IN µM). — Total length 180-220 (av. 200), of apical horn 45-60 (av. 50), of feet 65- 95 (av. 80), of cephalis 35-40 (av. 38), of thorax with terminal tube 55-80 (av. 65), width of cephalis 60-65 (av. 62), of thorax with feet 105-130 (av. 120), of terminal tube measured at the distal rim 45-60 (av. 50).

DESCRIPTION

Test conical with well rounded hemispherical cephalis and inflated thorax. Cephalis with slightly curved, three-bladed apical horn. Surface of cephalis with a system of irregularly arranged ridges. On the lower part of cephalis some ridges aligned along the arches of the initial skeleton. Initial spicule with A, V, D, two L, and two l. Ax moderately long, simple. Arches Dl, Ll, and VL clearly expressed on the inner side of test. Thorax either rounded or triangular in cross section, its distal part tapering, leaving a rounded triangular aperture. Thoracic wall double-layered ; inner layer thin, perforated by small pores; outer layer with a superimposed system of strong pore frames, partly fused to irregular ridges. Distal part of thoracic wall poreless forming a short terminal tube or a velum. In some specimens it is separated from thorax by a transversal ridge, and in very few specimens it is closed distally. Feet three-bladed with the external blade emerging from the collar suture, and the two lateral blades arising from the distal part of thorax.

REMARKS

Anaticapitula germanica n. gen., n. sp. differs from A. pennata n. gen., n. sp. by a well distinct cephalis, a very short terminal tube, and much longer 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.