Calcarea (Taxonomic Rank: Class)
Calcareous sponges.

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	Astraeospongia Barroisia Clathrina Diaplectia Holcospongia Leucetta Leucilla Leuconia Leucosolenia Levinella Monoplectroninia Murrayona Oculospongia Petrobiona Plectroninia Porosphaera Raphidonema Stellispongia Sycetta

= Extinct Life Forms   = Living Creatures   = Fictional Beasts   = Inanimate Objects   = Ethereal Entities    = At least one collectible is catalogued