Abstract
The new heteractinid calcareous sponge Maluviospongia densa occurs at two levels in the middle part of the Lower to Middle Devonian Bird Fiord Formation near Goose Fiord and Baad Fiord in southwestern Ellesmere Island. These occurrences further document that Canada was a principal center of heteractinid evolution during the early and middle Paleozoic. The small, stalked to bowl-shaped sponges have canaled skeletons of irregularly oriented, though size-ranked, octactines that are enlarged to lumpy, grotesque elements in the inner endosomal part of the wall.
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