Genus Leucetta Haeckel, 1872

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

Genus 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 is a distinct layer of subcortical inhalant cavities present. The atrium may be reduced to a system of exhalant canals that open directly into the osculum or may be a large cavity (modified from Borojevic et al. 2002).