Hiscocapsa tuberculata 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 : 127

Hiscocapsa tuberculata Dumitrică n. sp.

Fig. 11 l

Description. Shell composed of four segments of which the first three form a narrow conical body whereas the last one is large, spherical, slightly tuberculate and open distally. Cephalis partly preserved: it should have been poreless and smooth. Thorax and abdomen trapezoidal, bearing small circular pores which are hexagonally framed and arranged in 3 or 4 circumferential rows especially in the abdominal segment. Collar and lumbar strictures virtually indistinct but the post-lumbar one very well marked by the sudden inflation of the postabdominal segment. This segment is slightly nodose and has larger circular pores disposed in a quincuncial manner. Distal end of postabdominal segment slightly flattened and bearing a smooth bordered and narrow aperture without protruding rim.

Studied material. A single specimen.

Holotype. The illustrated specimen from sample OZ826, coll. MGP-PD, stub PD120 -OZ826- R11-05 .

Dimensions. Height of test approximately 145 µm, of cephalo-abdominal segment 56 µm, of postabdominal segment 92 µm, diameter of postabdominal segment 128 µm, of distal aperture 20 µm.

Etymology. From Latin tuberculatus , - a, - um, by having a tuberculate postabdominal segment.

Remarks. Morphologically, this species is very close to Doliocapsa aitai n. sp. ( Fig. 11h ), from which it differs in having a tuberculate postabdominal segment and a flatter distal end.

Occurrence. Very rare in the Sardinian section.

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.