GENUS LEUCETTA HAECKEL, 1872

Type species: Leucetta primigenia Haeckel, 1872 .

Diagnosis: ‘ Leucettidae with a homogeneous organisation 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’ (Borojević et al., 2002).