Toritenum corpulentum, 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 : 50-52

Toritenum corpulentum n. sp. ( Fig. 26 D-G)

HOLOTYPE. — Photo No. 54980; stub Mue 22/17; Musée de Géologie , Lausanne, No. 74405 ( Fig. 26D ). ETYMOLOGY. — From the Latin corpulentus: corpulent, fat, stout.

MATERIAL EXAMINED. — Six illustrated specimens and about 20 not illustrated specimens from the type horizon (sample Mue 22).

DIMENSIONS ( IN µM). — Length without apical horn 305-440 (av. 375), length of apical horn 20-130 (av. 65), of cephalis 45-47 (av. 55), of thorax 250-380 (av. 315), maximum width of cephalis 75-115 (av. 90), of thorax 240-280 (av. 265).

DESCRIPTION

Test large, conical proximally, cylindrical medially with a slightly widening distal end. Cephalis hemispherical with a moderately long, slender apical horn. Pores of cephalis very small, irregularly disposed. Collar boundary above the first circumferential ridge of the thorax and well marked by a sudden change in outline from subcylindrical to wide-conical. Thorax large, increasing rapidly in diametre up to one third of its length, then cylindrical medially, and increasing again distally. Wall thin with six to 12 rather closely spaced circumferential ridges separated by commonly two to five transverse rows of alternate pores. Ridges of proximal part, especially, with fine thorns.

REMARKS

Morphologically Toritenum corpulentum n. gen., n. sp. is very close to T. hirsutum n. gen., n. sp. from which it only differs by being thicker, by having a thin and short apical horn, a well marked cephalis, closer ridges, and a wider distal end.

Figures

FIG. 26. — A-C, H, Toritenum hirsutum n. gen., n. sp.; A, holotype; B, C, H, paratypes; C, broken specimen showing non-segmented internal surface; H, broken specimen, basal view showing details of initial spicule; D-G, Toritenum corpulentum n. gen., n. sp.; D, holotype; E-G, paratypes. Scale bars: A-G, 100 µm; H, 30 µm.