Saitoum macilentum, 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

Saitoum macilentum n. sp. ( Fig. 15J, K, M )

HOLOTYPE. — Photo No. 60023, 60024; stub Mue 22/23; Musée de Géologie , Lausanne, No. 74386 ( Fig. 15J, M ).

ETYMOLOGY. — From the Latin macilentus: thin.

OCCURRENCE. — Early Tithonian, Hybonotum Zone . MATERIAL EXAMINED. — Nine illustrated specimens, all from the type horizon (sample Mue 22).

DIMENSIONS (IN µM). — Length of cephalis 40-60 (av. 50), of feet 40-65 (av. 55), of apical horn 34-42 (av. 36), width of cephalis 45-70 (av. 60).

DESCRIPTION

Cephalis globular to hemispherical, smoothsurfaced, with pores of variable size and arrangement. Apical horn long, three-bladed, blades thin, gently pointed distally. Arches Al and AV well marked. Ventral spine very short, three-bladed. Feet long, three-bladed, strongly diverging and curved, tapering distally. No velum or remains of a velum visible in the specimens available.

REMARKS

Saitoum macilentum n. sp. may be compared to the Middle Jurassic Poulpus sp. of Takemura (1986) in having rather large pores and diverging, curved feet. Among the specimens assigned to this species some are different in the degree of divergence of feet or the thickness of cephalic wall.

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.