Occurrence of dyctid hexactinellid sponges in the Upper Devonian of the Holy Cross Mts

Abstract

Hexactinellid sponges with rigid, laterally fused, dictyonine skeletons are reported from the Frasnian rocks of the Holy Cross Mts, Central Poland. This occurrence with nearly contemporary undescribed forms from Belgium and Western Australia, extend the range of the Hexactinosa back from the Triassic, the previously earliest described sponges of the order.