Microsandwichia, Dumitrica, 2022

Dumitrica, Paulian, Dieni, Iginio & Massari, Francesco, 2022, Valanginian Radiolarians Of Ne Sardinia (Italy) In The Frame Of The Weissert Event, Acta Palaeontologica Romaniae 18 (2), pp. 97-159 : 114

Microsandwichia plana (Hori 1999)

Fig. 8r

1999 Orbiculiforma (?) plana Hori, p. 62, figs. 4. 17-20.

Description. Shell flat, thin and circular, each face with dense and small circular pores arranged in different short parallel rows. Border without spines. The two faces slightly displaced from one another.

Studied material. A single specimen in sample OZ834, coll. MGP-PD, stub PD120-OZ834-R09-31.

Dimensions. Diameter of shell 165 µm.

Remarks. The specimen found in the upper Valanginian of Sozastru section resembles perfectly the Tithonian specimens illustrated by Hori (1999) from the Yamizo Mountains of central Japan.

Occurrence. Tithonian of Japan, late Valanginian of Sardinia.

Spumellaria gen et sp. indet.

Fig. 8s, t

Remarks. Although the two lenticular specimens seem to be similar, their determination is impossible. No species of this type was illustrated until present.

Figures

Fig. 8. a - Becus coronatus Dumitrică n. sp., OZ839. b-f1, j - Becus triangulocentrum Dumitrică, b - OZ836; c - same, lateral view, d - OZ836. e, f - OZ825, f1 - lateral view of fig. f. g - Alievium regulare (Wu & Li), OZ836. h, i, k, l - Alievium rotundum Dumitrică n. sp.: h, specimen destroyed showing internal structure, OZ836; i - OZ836, k, l - holotype, OZ834. m - Alievium incomptum Dumitrică n. sp., OZ836. n - Godia (?) lenticulata Dumitrică n. sp., OZ834. o - Godia (?) lens Dumitrică n. sp., OZ825. p - Alievium eurasicum Dumitrică n. sp., OZ825. r - Microsandwichia plana (Hori), OZ834. s, t - Spumellarian gen. et sp. indet., OZ834. figs. c, e-h, k, m, r, t x250, figs. a, b, d, i, j, l, p, s x300; figs. n, o, t x400.