This family of termites is widely distributed and contains around 500 species. They are often called drywood or dampwood termites and are regarded as primitive termite forms, based on morphology, social structure or behaviour as well as fossil records. They are often of concern as quarantine pests because they nest within wood and can be easily transported and introduced into other countries. Important pest species are, for example, Cryptotermes brevis or Incisitermes minor. The structure of the imago mandibles is often important for taxonomic classification.
The following genera are currently entered under this family: