Genus Teichonopsis Dendy & Row, 1913 TYPE SPECIES. — Teichonella labyrinthica Carter, 1878 by monotypy. DIAGNOSIS. — Pedunculate calyciform Grantiidae with a syconoid organization and an expanded atrium. The thin wall is highly folded and the convoluted edge corresponds to the oscular margin. DESCRIPTION The separation of this genus from Grantia is justified because of its particular pattern of growth, through which the atrial cavity becomes wide open. As it grows the sponge wall becomes a highly folded asymmetric leaf, freely traversed by the water current that runs from the lower cortical to the upper atrial surface.

Published as part of Borojevic, Radovan, Boury-Esnault, Nicole & Vacelet, Jean, 2000, A revision of the supraspecific classification of the subclass Calcaronea (Porifera, class Calcarea), pp. 203-263 in Zoosystema 22 (2) on page 222, DOI: 10.5281/zenodo.5392175