Pantanellium sp. 1

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 : 109

Pantanellium sp. 1

Fig. 7i

1885 Xiphosphaera cf. tredecimporata Rüst , p. 288, pl. 27, fig. 15.

?1974 Sphaerostylus lanceola Parona (ancestral form) – Riedel & Sanfilippo, p. 780, pl.1, fig. 4; pl. 12, fig. 1.

?1997 Pantanellium tredecimporatum (Rüst) – Dumitrică et al., p. 20, pl. 1, figs. 18, 24.

Dimensions. Diameter of shell 70 µm, length of shell without spines 93 µm, length of spines 50-70 µm.

Remarks. This species differs from the other two species occurring in the fauna herein studied by having a long ellipsoidal shape with wide pores and relatively thin cortical shell. Its spines are pointed, unequal in length and have relatively thick blades. The species resembles rather well the specimens determined as Pantanellium tredecimporatum (Rüst) illustrated by Dumitrică et al. ( 1997) from samples of the Masirah Island, Oman, considered as being Berriasian in age.

Occurrence. A single specimen in the sample OZ825.

Figures

Fig. 7 a - Praeconosphaera sphaeroconus (Rüst OZ826. b-d - Praeconosphaera antiqua (Parona): b - OZ834, c - OZ838, d - OZ825. e - Tritrabs ewingi (Pessagno), arm in lateral view, OZ836. f-h - Emiluvia chica Foreman, OZ836; f - face view, g - lateral view from a spine, h - lateral view of a broken specimen showing the medullary test. i - Pantanellium sp. 1, OZ825. j, l-n1 - Pantanellium squinabolli (Tan): j - OZ834; l, m - OZ834, n - OZ836; m1, n1, details of inner wall of pores. k - Pantanellium sp. 2, OZ834. o – Pantanellium cf. squinaboli (Tan), OZ836; p - Praeconocaryomma copiosa Wu, OZ836. r - Praeconocaryomma thurowi Dumitrică n. sp., OZ836. s, t - Triactoma tithonianum Rüst, side views; s - OZ834, broken off specimen showing medullary shell; t - OZ825, equatorial view, t1 – face view; s1, t2 - detail of the base of spines of figs. s and t, respectively, x800. Figs. a-h, l-n x200; i-k, o-r x300; s, t x400, m1, n1 x500.