Theonellidae is a family of sponges belonging to the order Tetractinellida, which was first described by Robert von Lendenfeld in 1903.Lendenfeld, R. von. (1903). Porifera. Tetraxonia. pp. vi-xv, 1-168. In: Schulze, Franz Eilhard (Ed.), Das Tierreich. 19. (Friedländer: Berlin)
Theonella conica is known for hyperaccumulation of molybdenum due to the action of an endosymbiont microbe, Entotheonella sp.
Genera Colossolacis Schrammen, 1910 Dactylocalcites Discodermia du Bocage, 1869 Manihinea Racodiscula Siliquariaspongia Theonella
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