1934 Psolidiella Mortensen, 1926 Psolidocnus O'Loughlin & Alcock, 2000 Roweia Thandar, 1985 Squamocnus O'Loughlin & O'Hara, 1992 Staurocucumis Ekman, 1927 Staurothyone H.L. Clark, 1938 Stereoderma Ayres, 1851 Thyonella Verrill, 1872 Thyonidium Düben & Koren, 1846 Trachasina Thandar Trachycucumis Thandar & Moodley, 2003 Trachythyone Studer, 1876 References Echinoderm families