Alternative spellings: Cydninae, Cydninae
Parent taxon: Heteroptera according to T. Wappler 2003
Sister taxa: Acanthiidae, Acanthosomatidae, Anacoloptera, Aradidae, Berytidae, Capsidae, Cercopyllis, Ceresopsis, Cimicoidea, Cimicomorpha, Coleopteropsis, Coreidae, Cryptocerata, Dinidoridae, Dipsocoromorpha, Enicocephalomorpha, Eocimicidae, Galgulidae, Geocorisae, Gerromorpha, Gymnocerata, Hadrocoridae, Hydrobatidae, Hydrocorisae, Leptopodomorpha, Lygaeidae, Minuta, Nepidae, Nepomorpha, Paraknightiidae, Pentatomidae, Pentatomomorpha, Piesmatidae, Scaphocoridae, Shurabella, Shurabellidae, Sphongophoriella
Subtaxa: Aethus, Amnestinae, Clavicorinae, Cydnavites, Cydnus, Cyrtomenus, Dallasiellus, Discostoma, Necrocydnus, Procydnus, Stenopelta, Thlibomenus
Ecology: