Promegistus
Promegistus armstrongi is a species of parasitiform mite in the order Mesostigmata, suborder Trigynaspida. It is the only member of the genus Promegistus and the family Promegistidae. It is endemic to Australia. Adults are believed to be parasitic on large carabid beetles, while young juveniles like other trigynaspids are thought to be free living.