Cuboctostylus n. gen., a new Late Cretaceous spicule-bearing spumellarian Radiolaria from southern Sakhalin (Russia)

A new spicule-bearing genus of Spumellaria (Radiolaria) Cuboctostylus, and three new species – Cuboctostylus kasinzovae, C. sakhalinensis, and C. trifurcatus, are described from the Late Cretaceous deposits of Sakhalin (Russia). This genus has many characters in common with the Lower-Middle Cretaceous genus Pyloctostylus Dumitrica, from which it differs essentially in having no pylome and the spicule centrally placed. The genus has also some characters in common with the Paleozoic family Polyentactiniidae and the Cenozoic family Orosphaeridae.