Saitoum reticulatum, 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 : 28-30

Saitoum reticulatum n. sp. ( Fig. 16C, D )

Saitoum pagei – Matsuoka 1998: pl. 10, fig. 157. Saitoum sp. – Mekik et al. 1999: 728, fig. 7K.

HOLOTYPE. — Photo No. 13753; Musée de Géologie , Lausanne, No. 74387 ( Fig. 16C ).

ETYMOLOGY. — From the Latin reticulatus: reticulate. OCCURRENCE. — Early Tithonian, Hybonotum Zone to basal Berriasian ( Matsuoka 1998).

MATERIAL EXAMINED. — 11 specimens from the type horizon (sample Mue 22), one specimen from sample Mue 6, three specimens from sample Mue 9.

DIMENSIONS ( IN µM). — Length of cephalis 60-70 (av. 65), of feet 75-90 (av. 80), of apical horn 40-60 (av. 50), width of cephalis 70-80 (av. 75).

DESCRIPTION

Cephalis globular, short, with small pores surrounded by thin protruding rims. Most rims interconnected by ridges forming a reticulum on the surface of cephalis. Base of cephalis without thick border. Apical horn long, tapered, threebladed, with blades thin, separated by deep groves. Feet divergent, curved, gently tapered distally, and three-bladed, the odd blade internal. External blades separated by large, rounded grooves as prolongations of a wide cephalic pore. Remains of a very thin velum preserved in some specimens.

REMARKS

Saitoum reticulatum n. sp. resembles S. pagei in general shape of cephalis and superficial ornamentation, but differs essentially from it in having much shorter and less curved feet.

Figures

FIG. 16. — A, B, Saitoum pagei Pessagno, 1977; A, dorsal view showing slight constrictions along arches Al; B, right lateral view showing remnants of velum; C, D, Saitoum reticulatum n. sp.; C, holotype, left lateral view showing remnants of velum; D, paratype, right lateral view; E, Saitoum sp. aff. S. reticulatum n. sp., right lateral view; F-H, Saitoum virgulispina n. sp., holotype, right lateral, ventral, and basal views respectively; I, J, Saitoum sp. A, right lateral and basal views; K, L, Saitulpus neojurassicus n. gen., n. sp.; K, holotype, left lateral view; L, paratype, dorsal view. Abbreviations: A, apical spine; l, secondary lateral spine. Scale bars: 30 µm.