Doliocapsa favopora 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 : 128

Doliocapsa favopora Dumitrică n. sp.

Fig. 11o

Description. Conical shell consisting of four segments increasing regularly in length and diameter as added. Cephalis spherical, smooth-surfaced and probably without apical horn. Following three segments with inflated outline. Thorax a little larger than cephalis, with smooth surface and practically poreless, except a circle of very small pores at the contact with the cephalis. Abdomen trapezoidal in lateral view with 4 circumferential rows of small pores. Postabdominal segment with 6-7 circumferential rows of pores. Pores quincuncially disposed with thin intervening bars. Aperture large, circular with protruding rim. This rim and the slightly serrate margin of the test suggest a possible thin distal segment dissolved after the death of the specimen.

Studied material. One specimen from sample OZ834.

Holotype. The illustrated specimen, coll. MGP-PD, stub PD120 -OZ834- R09-34 .

Dimensions. Total length 146 µm, diameter of last segment 110 µm.

Etymology. From the Latin favus - honeycomb, and porus - pore, due to the characteristic distribution of pores on the postabdominal segment.

Remarks. Doliocapsa favopora n. sp. is morphologically quite close to Doliocapsa erbae n. sp. by the general shape and number of segments, but differing by having larger postabdominal pores distributed in transversal circles.

Occurrence. A single specimen in the Ozzastru section, upper Valanginian.

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.