Becus triangulocentrum Dumitrică, 1997

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 : 113

Becus triangulocentrum Dumitrică, 1997

Figs. 8 b-f1, j

1995 Alievium helenae Schaaf – Baumgartner et al., p. 80, pl. 3228, fig. 2, non 1-4.

1997 Becus triangulocentrum Dumitrică , p. 216, pl. 1, figs. 8, 9; pl. 2, figs 1, 2-4,?5,?6.

1997 Becus triangulocentrum Dumitrică – Dumitrică et al., p. 216, pl. 1, figs. 8, 9; pl. 2, figs. 1, 2-4,?5,?6.

2017 Praeconocaryomma mammillaria (Rüst) – Wu et al., p. 347, pl. 1, figs. 11, 12.

Remark s. Unlike the original types of the species (Dumitrică, 1997), the specimens from the S’Ozzastru section assigned to this species seem to exhibit a wider variability. The variability is mostly a result of the dissolution of the thin skeletal elements of the shell and also of some or all primary spines that seem to have a fragile root, so that many specimens are preserved just as circular disks without any remains of spines or with some remains ( Figs. 8b,

8c). Praeconocaryomma mammillaria of Wu et al. (2017) is wrongly determined; it is not spherical as Praeconocaryomma , but lens-shaped with spongy lateral sides. Its face view exhibits very clearly the central triangle of nodes surrounded by a circle of 12 nodes. Fig. 8d , that shows very well the triangular meshwork is probably a young specimen that could not yet cover the initial structure.

Range and occurrence. Common in the Berriasian and Valanginian and sparse in the lower Hauterivian.

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.