Doliocapsa utoi Dumitrică, 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 : 129

Doliocapsa utoi Dumitrică n. sp.

Fig. 11d

1982 Amphipyndacid gen. et sp. indet. – Okamura & Uto, pl. 2, fig. 11, non 12.

Description. Shell ovoid, probably four segmented and opened distally. Cephalis, incompletely preserved, should have been imperforated, smooth-surfaced and slightly pointed. Thorax and abdomen hardly to separate from each other; they are trapezoidal in lateral view and their pores irregularly disposed on the proximal part of this segment and in circumferential rows on the distal portion. Last segment higher and larger with convex outline; pores larger in the middle part, decreasing in size distally and arranged quincuncially in circumferential rows Studied material. A single specimen.

Holotype. The illustrated specimen, coll. MGP-PD, stub PD120 -OZ824- R13-18 .

Dimensions. Length 172 µm, maximum diameter 122 µm.

Etymology. The species is dedicated to Hideyuki Uto who, together with M. Okamura, illustrated this radiolari- an from the Lower Cretaceous of Japan.

Remarks. A perfectly similar species was illustrated by Okamura & Uto ( 1982) from the probably coeval sample YK-546 from the Lower Cretaceous chert sequence in the Yokonami Mélange of Shimanto Belt, Shikoku ( Japan). This new species ressembles somehow D. favopora n. sp., from which it differs in having smaller postabdominal pores and less marked intersegmental constrictions.

Occurrence. Upper Valanginian of Sardinia and probably of Japan.

Figures

Fig. 11 a-b1 - Hiscocapsa grutterinki (Tan): a, OZ834, b, OZ839. c, c1, d, g - Hiscocapsa (?) ventriosa Dumitrică n. sp.: b, OZ839, c, OZ836, c1, aperture, g - complete specimen, V40, Svinița, Romania. e - Doliocapsa utoi Dumitrică n. sp., OZ824. f, f1, h, h1 - Hiscocapsa rugosacutis Dumitrică n. sp., OZ826. i-i1 - Hiscocapsa aitai Dumitrică n. sp., OZ824. p, s -Hiscocapsa lagunculoides Dumitrică n. sp., OZ834, OZ838; p1, s1- distal apertures of both specimens. j - Squinabollum cf. elegans Dumitrică n. sp., OZ826. k, k1 - Doliocapsa weisserti Dumitrică n. sp., OZ834. l - Hiscocapsa tuberculata Dumitrică n. sp., OZ826. m, m1, n - Doliocapsa erbae Dumitrică n. sp., OZ834. o – Doliocapsa favopora Dumitrică n. sp., OZ834. r - Doliocapsa mediterranea Dumitrică n. sp., OZ834. Figs. a-d, j x250; figs. c1, e, e1, f, f1, g, h, i, i1, k, k1, l, p, r x300, m-o, p1 x400.