Saitoum labeosum, 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 : 26-28

Saitoum labeosum n. sp. ( Fig. 15 F-I, L)

Saitoum sp. A – Kiessling 1995: pl. 61, fig. 17.

Saitoum sp. aff. S. dercourti Widz & De Wever, 1993 – Zügel et al. 1998: 12, pl. 1, fig. 10.

HOLOTYPE. — Photo No. 23086; stub Mue 9; Musée de Géologie , Lausanne, No. 74385 ( Fig. 15F ).

ETYMOLOGY. — From the Latin labeosus: thick-lipped. TYPE LOCALITY. — From the same section as Mue 22. TYPE HORIZON. — Sample Mue 9, from the central part of a 20 cm thick limestone bed, non-silicified apart from small silicified lenses, 50 cm above a conspiceous silicified limestone bed with well preserved ammonites.

MATERIAL EXAMINED. — 16 specimens of which six from sample Mue 9, two from Mue 6, three from Mue 22, one from sample SB 3, one from sample Hob 11, and three from sample Hob 32.

DIMENSIONS ( IN µM). — Length of cephalis 75-95 (av. 80), of feet 65-85 (av. 75), of apical horn 30-60 (av. 40), width of cephalis 80-95 (av. 85).

DESCRIPTION

Cephalis globular, thick-walled, with pores surrounded by thick protruding rims. Collar border between dorsal and primary lateral feet thick, protruding. Initial spicule robust with MB strongly swollen basally, but with A thin inside the cephalic cavity. Apical horn long, generally thin, three-bladed, with thick blades and very narrow grooves. Distal end of ventral spine surrounded by a wide ditrema with protruding rim placed above the thickened cephalic border. Feet usually as long as the diametre of cephalis or shorter, downward directed or slightly divergent and slightly curved. They are massive or rounded triangular in cross section proximally and medially, and sensibly three-bladed distally, with one external and two internal blades. When well preserved, cephalis continues distally in a very delicate velum. In very few specimens where the velum is well preserved it is closed distally.

REMARKS

By the shape of cephalis and length and curvature of feet Saitoum labeosum n. sp. may be compared with S. dercourti Widz & De Wever, 1993 from which it differs by having pores with thick protruding rims, a different collar border, and massive feet.

Figures

FIG. 15. — A-C, Saitoum differtum n. sp.; A, B, holotype, right lateral and basal views; C, paratype, left lateral view; D, E, N, Saitoum kapewinteri n. sp.; D, N, holotype; D, view from the left primary lateral spine; N, detail, ventral view; E, paratype, ventral view; F-I, L, Saitoum labeosum n. sp.; F, holotype, dorsal view; G-I, L, paratypes; G, ventral view showing the ditreme; H, broken specimen, right lateral view showing the thin apical spine and thick median bar; I, specimen with distally closed velum; L, basal view showing the left secondary lateral spine prolonged outside (anomaly?); J, K, M, Saitoum macilentum n. sp.; J, M, holotype, dorsal and basal views; K, paratype, left lateral view showing a strong arch Al. Abbreviations: A, apical spine; l, secondary lateral spine. Scale bars: 30 µm.