Stichomitra, Cayeux, 1897

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 : 12-13

Stichomitra ? sp. 2

( Fig. 4K )

FIGURED SPECIMEN. — ULVG-7328.

MATERIAL. — 18 specimens (recovered with the hydrogen peroxide method); 15 specimens (recovered with the acetic acid method) .

DESCRIPTION

Small Nassellaria with poorly developed segmental divisions. Pores of the test present well-developed polygonal pore-frames. The species possesses an apical horn (broken in the figured specimen).

REMARKS

The poor development of segmental divisions in all recovered specimens does not enable their precise visualization and, consequently, makes difficult a more precise statement.

Family CANNOBOTRYIDAE Haeckel, 1881 Genus Rhopalosyringium Campbell & Clark, 1944

Rhopalosyringium magnificum Campbell & Clark, 1944 ( Fig. 4L )

Rhopalosyringium magnificum Campbell & Clark, 1944: 30 , pl. 7, figs 16, 17. — Empson-Morin 1981: 265, pl. 8, fig. 1a-d and synonymy therein.

FIGURED SPECIMEN. — ULVG-7329.

MATERIAL. — 17 specimens (recovered with the hydrogen peroxide method); five specimens (recovered with the acetic acid method).

OCCURRENCE. — Maastrichtian of California (Campbell & Clark 1944); Campanian of DSDP Leg 32, Site 313, Mid-Pacific Mountain (Empson-Morin 1981).

Rhopalosyringium kleinum Empson-Morin, 1981 ( Fig. 5A )

Rhopalosyringium kleinum Empson-Morin, 1981: 265 , pl. 8, figs 2, 3 and synonymy therein.

FIGURED SPECIMEN. — ULVG-7330.

MATERIAL. — Two specimens (recovered with the hydrogen peroxide method); 11 specimens (recovered with the acetic acid method).

OCCURRENCE. —Campanian of DSDP Leg 32, Site 313, Mid-Pacific Mountain (Empson-Morin 1981).

Figures

FIG. 4. — SEM images of Radiolaria recovered from the sample 999B/60/2W/70-74 cm: A, Archaeodictyomitra cf. A. squinaboli Pes- sagno,1976 (H2O2 method);B, Archaeodictyomitra cf. A. lamellicostata (Foreman, 1968) (H2O2 method); C, Archaeodictyomitra? sp. 1 (H2O2 method); D, Archaeodictyomitra? sp. 2 (H2O2 method); E, Dictyomitra sp. 1 (H2O2 method); F, Dictyomitra sp. 2 (H2O2 method); G, Mita regina? (Campbell & Clark, 1944) (CH3COOH method); H, Amphipyndax tylotus Foreman, 1978 (H2O2 method); I, Stichomitra asymbatos Foreman,1968 (H2O2 method);J, Stichomitra? sp.1 (H2O2 method); K, Stichomitra? sp. 2 (H2O2 method); L, Rhopalosyrin- gium magnificum Campbell & Clark,1944 (H2O2 method). The chemical compound after each species indicates the chemical method applied in the recovery of each figured specimen. Scale bars: 100 µm.

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.