Minchinellidae


Minchinellidae is a family of calcareous sponges, members of the class Calcarea. It is the only family in the monotypic order Lithonida. The families Petrobionidae and Lepidoleuconidae have also sometimes been placed within Lithonida, though more recently they have been moved to the order Baerida. Thanks to their hypercalcified structure, minchinellids have a fossil record reaching as far back as the Jurassic Period.

Description

Minchinellids are hypercalcified sponges. They have a robust skeleton of tetractine calcareous spicules. The tetractine spicules are propeller-shaped, with three curved actines radiating perpendicular to a straight basal actine. These spicules may be linked by their basal actines or cemented together by calcite. The skeleton is reinforced with layers of loose diapason spicules. Minchinellid sponges have a leuconoid canal system.

List of genera