Saitoum bicorniculatum, 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 : 23-24

Saitoum bicorniculatum n. sp. ( Fig. 14 E-G)

HOLOTYPE. — Photo No. 13741, 13742; Musée de Géologie , Lausanne, No. 74378 ( Fig. 14E, F ).

ETYMOLOGY. — From the Latin bi: two; and corniculatum: having small horns.

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

DIMENSIONS ( IN µM). — Length of cephalis 55-58, of feet 95-105, of apical horn 30-37, of ventral spine 20-30, width of cephalis 70.

DESCRIPTION

Cephalis very small, low, trapezoidal in lateral view, with long apical horn and ventral spine, and three long curved feet. Apical horn straight, three-bladed, strongly eccentric and inclined dorsally. Ventral spine well developed but shorter than the apical. Cephalic wall with small pores of variable size and irregular arrangement; usually size of pores decreases apically. Feet long, strongly divergent and curved inwardly. Lower border of cephalis simple.

REMARKS

Morphologically, this new species is very close to S. pagei from which it differs by having a well developed ventral spine, a low cephalis, and pores without protruding rims.

Figures

FIG. 14. — A-D, Saitoum ambiguum n. sp.; A, B, holotype, latero-ventral and basal views respectively; C, D, paratype, dorsal and basal views showing the two secondary lateral spines extended outside wall; E-G, Saitoum bicorniculatum n. sp.; E, F, holotype, right lateral and basal views showing the long ventral spine and the dorsally displaced apical horn; G, paratype, left lateral view; H-J, Saitoum curtipes n. sp.; H, holotype, ventral view; I, J, paratypes; I, specimen with remnants of velum; J, basal view; K-M, Saitoum(?) delicatum n. sp.; K, holotype, ventral view showing a constriction along arch AV; L, M, paratypes; L, basal view showing remnants of velum; M, right lateral view showing a constriction along arch Al. Abbreviations: A, apical spine; l, secondary lateral spine; V, ventral spine. Scale bars: 30 µm.