Schewiakoff, 1926
Family Amphilithidae Haeckel, 1882, emend. Schewiakoff, 1926
Genus Amphibelone
Genus Amphilithium
Family Astrolithidae Haeckel, 1860, emend. Schewiakoff, 1926
Genus Acantholithium
Genus Astrolithium
Genus Astrolonche
Genus Heliolithium
Family Pseudolithidae Schewiakoff, 1926
Genus Dicranophora
Genus Haliommatidium
Genus Pseudolithium