Hiscocapsa grutterinki (Tan, 1927)

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 : 125

Hiscocapsa grutterinki (Tan, 1927)

Figs. 11 a, a 1, b, b1

1927 Cyrtocapsa grutterinki Tan Sin Hok , p. 64, pl. 13, fig. 110.

1981 Cyrtocapsa grutterinki Tan Sin Hok – Schaaf, p. 433, pl. 6, figs. 6a-b.

1982 Gen. et sp. indet. – Okamura & Uto, pl. 3, fig. 13.

1983 Williriedellum sp. 1 – Origlia-Devos, p. 214, pl. 24, fig. 15, non 16.

1988 Cyrtocapsa sp. cf. C. grutterinki Tan Sin Hok – Thurow, p. 400, pl. 8, figs. 2, 3.

1989 Cyrtocapsa grutterinki Tan Sin Hok – Tumanda, p. 36, pl. 5, fig. 6.

1992 Cyrtocapsa grutterin ki Tan Sin Hok (pars) – Ozvoldova & Petercakova, pl. 3, fig. 13, non 11.

1994 Hiscocapsa grutterinki (Tan, 1927) – O’Dogherty, p. 201, pl. 31, figs. 14-16; pl. 32, figs.1-3.

Studied material. Two specimens in samples OZ834 and OZ839 as follows: stub PD120 - OZ834- R10-11 and PD120 - OZ839- R02-07 .

Dimensions. Total length of shell with 3 segments 126- 152 µm, diameter of abdomen 105-138 µm.

Remarks. By its shape, Hiscocapsa grutterinki , without the postabdominal segment, as it usually occurs, resembles the williriedellid nassellarians from which it differs by having no sutural pore and by the shape of the distal end of the abdomen, that is flat and has angular borders, suggesting that, normally, it should have a thin-walled postabdominal segment.

Range and occurrence. Upper Valanginian to Aptian of Tethys so far as known.

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.

Fig. 1 Geologic map of the Siniscola area, NE Sardinia (from Dieni & Massari, 1971, updated in 1986). Legend: a - Recent and present alluvial deposits (Holocene). b - Scree deposits (Würm-Holocene). c - Detrital cones mostly composed of gelifraction limestone clasts (“éboulis ordonnés”) (Würm-Holocene). d - Uncemented alluvial cones mostly consisting of limestone clasts (Würm-Holocene). e - Terraced alluvial deposits composed of clasts of basement rocks (Riss?). f - Tightly cemented and dismembered alluvial cones mostly made up of gelifraction limestone clasts (Riss?). g - Cuccuru ’e Flores Conglomerate: polymict, chaotic and thick-bedded breccia and stratified sandstone (middle Eocene). h - Siniscola Marl: grey and grey-yellow marl and, in the upper part, alternating marl/marly limestone with ammonites and very abundant radiolarians and sponge spicules (late Valanginian). i - Schiriddè Limestone: light-brown cherty limestone and limestone with marly interbeds, containing ammonites, radiolarians, sponge spicules and calpionellids (early Valanginian). j - Monte Bardia Limestone: thick-bedded to massive white limestone in places bioconstructed, with corals, nerineids, etc. (early Tithonian - late Berriasian). k - S’Adde Limestone: light-brown to grey fine-grained, well-bedded limestone, condensed with hardgrounds near the base, cherty in the upper part, with ammonites and belemnites in the uppermost part (latest Bathonian - earliest Tithonian). l - Dorgali Formation: well bedded quartz-arenitic and locally ooidal brown dolostone (middle-late Bathonian). m - Crystalline basement (phyllite, micaschist, paragneiss, quartzite, etc.) (Palaeozoic). n - Fault. o - Attitude of beds and schistosity planes. p - Limits of slumped masses of Jurassic formations (Quaternary). q - Concave-upward slip surfaces delimiting rotational slumps (Quaternary). r - Edge of fluvial terrace. s - Quarry. A-A’ Trace of the geological section of Fig. 2. (extracted from Bottini et al., 2018).