Many of the families and genera of cheilostomes now have pages without illustrations of species. An alternative classification of the Stenolaemata, based upon Recent Russian systematics , is given in an alternative document. The arrangement of families in the file system, and in this page that you are reading, is not intended to imply endorsement of the systematic scheme.
Some families are distinctive and well defined.
However, others are inadequately defined, and there is no consistent version of a classification. The following list includes most of the families included in a variety of references. Several of these are either not very useful, or are considered by most authorities to be invalid. These are indicated by a smaller font in this list. I have included several families proposed in the past 15 years, but which appear not to have been generally adopted.