Crococapsa O’Dogherty, Goričan and Gawlick, 2017

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 : 130

Genus Crococapsa O’Dogherty, Goričan and Gawlick, 2017 , emended herein.

Type species. Sethocapsa hexagona Hori, 1999 .

Emended diagnosis. Conical tetracyrtid nassellarians having two-chambered cephalis and globose postabdominal segment. Cephalis without apical horn and, generally, poreless, and postabdominal segment not tuberculated, distally closed or having a discrete number of smaller pores grouped on the distal end. Collar and lumbar segmentation well recognizable or indistinct externally. Postlumbar boundary well distinguished by a well-marked stricture with or without a circumferential row of larger pores (ocelli).

Remarks. This genus, initially assigned to the family Minocapsidae , includes four-segmented species with last segment without tubercles, such as: Sethocapsa hexagona Hori, 1999 , Sethocapsa accincta Steiger, 1992 , Sethocapsa (?) subcrassitestata Aita, 1986, Sethocapsa (?) rutteni Tan, 1927 , Cyrtocapsa asseni Tan, 1927 , Sethocapsa horokanaiensis Kawabata, 1988 , Sethocapsa uterculus Parona, 1890 , Sethocapsa pseudouterculus Aita, 1986 , Sethocapsa zweilii Jud, 1994 , Sethocapsa kitoi Jud, 1994 , Sethocapsa lagenaria Wu and Li, 1982 , Sethocapsa sp. B and Sethocapsa sp. C of Aita & Okada (1986), Stichocapsa pseudoornata Tan , l927, Cyrtocapsa houwi Tan, 1927 , Cyrtocapsa asseni Tan, 1927 , Minocapsa aitai Hull, 1997 , Minocapsa (?) tansinhoki Hull, 1997 , and probably Minocapsa (?) sp. of Hull ( 1997). The ocelli, characteristic of the stratigraphically younger species (uppermost Jurassic and Lower Cretaceous), are smaller in the Upper Jurassic species or not differentiated from the pores of the postabdominal segment, and larger in the Lower Cretaceous ones. The type species does not seem to have large ocelli but smaller ones, well visible on the fig. 6.13 of Hori (1999) as a circle of small pores around the postlumbar boundary. A similar circle of small pores is visible in the specimen illustrated as Sethocaps a sp. A by Inose et al. (2018, fig. 6.20).

Range. Late Jurassic to Late Cretaceous.