Reticulotubulus tintinnabulum, 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 : 46

Reticulotubulus tintinnabulum n. sp. ( Fig. 24 A-C, I, J)

HOLOTYPE. — Photo No. 58111-58114; stub Mue 22/20; Musée de Géologie , Lausanne, No. 74401 ( Fig. 24A, B, I, J ).

ETYMOLOGY. — From the Latin tintinnabulum : small bell.

MATERIAL EXAMINED. — Seven illustrated specimens and many others not illustrated from the type horizon (sample Mue 22).

DIMENSIONS ( IN µM). — Total length 160-225 (av. 180), length of apical horn 30-40 (av. 35), of cephalis 25-40 (av. 35), of thorax 105-160 (av. 130), width of cephalis 35-55 (av. 50), of median part of thorax 95-120 (av. 105), of distal part 150-190 (av. 170).

DESCRIPTION

Test bell-shaped composed of two segments. Cephalis small, hemispherical, with a slender triradiate apical horn. Ventral spine connected to the two primary lateral spines by strong arches VL, not attached distally to test wall but continued into a ventral tube. Ventral tube long, latticed, cylindrical. Primary lateral spines and dorsal spine run shortly along the proximal interior wall of thorax. Collar stricture absent, the cephalis passing gradually into thorax, which is bell-shaped, having an expanded proximal part and a wide conical distal part, both separated by a wide concave portion. Distalmost part of thorax not preserved, but it seems to be ragged. Test fragile with very small pores on the cephalis and rounded hexagonal pores, increasing in size distally and alternately disposed in longitudinal rows, on the thorax.

REMARKS

Reticulotubulus tintinnabulum n. sp. resembles sensibly R. foremanae from which it differs by missing a collar stricture.

Figures

FIG. 24. — A-C, I, J, Reticulotubulus tintinnabulum n. sp.; A, B, I, J, holotype, left lateral and basal views with details of the proximal part of shell and of the initial spicule, note prolongation of ventral spine along the tube; C, paratype, right lateral view; D-H, Cornutella tella n. sp.; D, holotype; E-H, paratypes; E, basal view; F, apically broken specimen with garland-shaped distal end; G, young specimen; H, specimen with large terminal pores. Scale bars: A-I, 30 µm; J, 10 µm.