Leucetta Haeckel, 1872

Diagnosis. " Leucettidae with a homogeneous organization of the wall and a typical leuconoid aquiferous system. There is neither a clear distinction between the cortex and the choanoskeleton, nor the presence of a distinct layer of subcortical inhalant cavities. The atrium is frequently reduced to a system of exhalant canals that open directly into the osculum or may be a large cavity" (Valderrama et al. 2009).

Type species. Leucetta primigenia Haeckel, 1872 (by original designation).