Genus Sycettusa Haeckel

Type species— Sycetta (Sycettusa) stauridia Haeckel, 1872 (by monotypy).

Diagnosis — Heteropiidae with syconoid organization. Atrial and cortical skeletons are formed by tangential triactines and/or tetractines. The choanoskeleton is inarticulated, and is composed of unpaired actines of the subatrial triactines, and of centripetal actines of the pseudosagittal subcortical triactines (Borojevic et al. 2002b)