Class stenolaemata can be further divided into 21 families, Calvetidae, Corymboporidae, Crisiidae, Crisinidae, Cytididae, Diaperoeciidae, Diastoporidae, Frondiporidae, Hastingsiidae, Heteroporidae, Horneridae, Lichenoporidae, Mecynoeciidae, Oncousoeciidae, Pseudidmoneidae, Stigmatoechidae, Terviidae, Theononidae, Tretocycloecidae, Tubuliporidae, and order Cyclostomatida.