Tholodiscus, Petrushevskaya & Kozlova, 1972

Kochhann, Karlos G. D., Baecker-Fauth, Simone & Fauth, Gerson, 2013, Late Maastrichtian Radiolaria from ODP Leg 165 - Site 999 B, Colombian Basin, Geodiversitas 35 (1), pp. 5-20 : 16

Tholodiscus sp.

( Fig. 5K )

FIGURED SPECIMEN. — ULVG-7340.

MATERIAL. — Five specimens (recovered with the hydrogen peroxide method); four specimens (recovered with the acetic acid method).

DESCRIPTION

Discoidal test with rounded quadrangular outline and spongy meshwork. Four radial spines extend from the quadrant boundaries. Central area of each quadrant with secondary spines.

REMARKS

This species differs from the species assigned to the genus Orbiculiforma Pessagno, 1973 by the four radial spines at the quadrant boundaries.

Figures

FIG. 5. — SEM images of Radiolaria recovered from sample 999B/60/2W/70-74 cm: A, Rhopalosyringium kleinum Empson-Morin, 1981 (H2O2 method); B, Botryometra heros (Campbell & Clark, 1944) (H2O2 method); C, Cryptamphorella sp. (H2O2 method); D, Theocapsomma sp. (Empson-Morin, 1981) (CH3COOH method); E, Praeconocaryomma californiaensis Pessagno, 1976 (H2O2 method); F, Alievium? sp. (H2O2 method); G, Paronaella? sp. (H2O2 method); H, Orbiculiforma sp. 1 (H2O2 method); I, Orbiculifor- ma sp. 2 (CH3COOH method); J, Crucella sp. (H2O2 method); K, Tholodiscus sp. (H2O2 method); L, Spumellaria gen. et sp. indet. (H2O2 method). The chemical compound after each species indicates the chemical method applied in the recovery of each figured specimen. Scale bars: 100 µm.