Genus Sororistirps (Porifera, Hexactinellida, Ventriculitidae)

Abstract

Representatives of the genus Sororistirps, distinguished among the Ventriculites, have been detected in the Santonian – Maastrichtian rocks from the southeast of the Russian Plate. The structures of the skeletons and of the irrigation systems have been considered, the Sororistirps morphogenesis has been traced; the forms characteristic of the Santonian, Campanian and Maastrichtian spongiocomplexes have been determined.

Keywords

• morphogenesis
• biostratigraphy
• upper cretaceous
• santonian
• campanian
• maastrichtian
• the russian plate