Revision of Cretaceous species of the genera Euchitonia Ehrenberg and Spongotripus Haeckel (radiolaria) from Lipman’s collection

Abstract

The holotypes of Euchitonia santonica Lipman, 1952 and E. triradiata Lipman, 1960 are studied in detail. It is shown that they do not correspond to the diagnosis of the genus Euchitonia sensu Lipman, since one apophysis distinguished by the shape or size from the others is not opposed to the angle between them and all angles are different. The assignment of the species in question to the genus Euchitonia sensu Ehrenberg is revised. A new genus of Late Cretaceous radiolarian, Quasieuchitonia gen. nov., with the type species Q. electa sp. nov. is described; in addition, the species Q. santonica (Lipman) is referred to the new genus. The analysis of the holotype of Spongotripus aculeatus Lipman, 1952 has shown that it, like the holotype of Euchitonia triradiata Lipman, 1960, belongs to the genus Pseudoaulophacus Pessagno, 1963.