Anaticapitula clauda, 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

Anaticapitula clauda n. sp. ( Fig. 27A, B, K )

Artostrobium (?) sp. A – Matsuoka 1998: 171, fig. 150.

HOLOTYPE. — Photo No. 28320; stub Mue 22/1; Musée de Géologie , Lausanne, No. 74407 ( Fig. 27A ). ETYMOLOGY. — From the Latin claudus: lame, without feet.

MATERIAL EXAMINED. — 16 illustrated specimens from the type horizon (sample Mue 22) and from other samples.

OCCURRENCE. — Early Tithonian from the Solnhofen area, southern Germany and early Berriasian from western Pacific (Mariana Trench).

DIMENSIONS (IN µM). — Total length 170-210 (av. 185), length of apical horn 30-55 (av. 45), maximum width 85-105 (av. 95), width of the thoracic constriction 65-85 (av. 70), of basal rim 70-110 (av. 90).

DESCRIPTION

Highly ovate to ovoid main test comprising the cephalis and the thorax. Distal part of thorax tubular, slightly increasing in diametre distally. Initial spicule as for the genus, with Ax much thinner than the other spines and curved when completely preserved. Apical horn pyramidal, subaxial with three broad blades; two blades originated in the top of cephalis, the third connect- ed to the dorsal spine and extending as a rib along the surface of test. Cephalic and thoracic wall covered by broad longitudinal and diagonal ridges that are melting distally to form a superimposed outer layer with few small pores. Terminal tube bearing very small, irregularly scattered pores.

REMARKS

Anaticapitula clauda n. gen., n. sp. differs from all other species of Anaticapitula n. gen. by lacking feet. The specimen illustrated by Matsuoka (1998) as Artostrobium (?) sp. A may be well compared to the specimens from the Solnhofen area.

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.