Williriedellum cordiforme 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 : 121

Williriedellum cordiforme Dumitrică n. sp.

Fig. 10r

?1981 Cryptamphorella conara (Foreman) – Schaaf, pl 9, figs. 15a-b.

Description. Cephalothorax typical for the genus with spherical and imperforate cephalis and thorax partly sunk in the abdominal cavity. Abdomen heart-shaped with irregular surface and circular pores arranged more or less quincuncially. Sutural pore with protruding rim. Distal aperture at the end of acute distal part.

Studied material. A single specimen in OZ837.

Holotype. Fig. 10r , coll. MGP-PD, stub PD120 -OZ837- R06-17 .

Dimensions. Height of shell 136 µm, diameter of abdomen 128 µm.

Etymology. From the Latin cordiformis – e = heart-shaped, due to its heart-shaped abdomen.

Remarks. This specimen resembles partly the specimen assigned questionally to Cryptamphorella conara illustrated by Schaaf due to its cordate abdomen and the absence of the inverted conical distal segment.

Occurrence. A single specimen in sample OZ837.

Figures

Fig. 10 a-c1 - Hemicryptocapsa (?) bellireticulum (Wu & Li): a - OZ825, b - OZ836. c - OZ838, c1 - OZ824. d-f, j-j2 - Williriedellum labeosum Dumitrică n. sp.: d, e, j-j2, OZ837, f - OZ834. g, g1 - Cryptamphorella circumthoracica Dumitrică n. sp., OZ838; g1 - view of apical part. h, k-o – Cryptamphorella dumitricai Schaaf: h - detail of sutural pore, k - OZ825, l - OZ 824, m - OZ838, n-o, OZ839. i, i1- Williriedellum gilkei Dumitrică, OZ838. p - Zhamoidellum ovum Dumitrică, OZ839. r - Williriedellum cordiforme Dumitrică n. sp., OZ837. s, s1 - Williriedellum occultithorax Dumitrică n. sp. in lateral and obliquely apical views, OZ826. t-t2 – Cryptamphorella crassilabrosa Dumitrică n. sp., OZ837: t, t1 - holotype in two positions, t2 – sutural pore much magnified showing inside the wall of the hidden thorax. Figs. a-f, i, h, k-o, r x250; g, gi, h, t, t1 x300.