''Promegistus armstrongi'' is a species of parasitiform mite in the order

Mesostigmata Mesostigmata is an order of mites belonging to the Parasitiformes. They are by far the largest group of Parasitiformes, with over 8,000 species in 130 families. Mesostigmata includes parasitic as well as free-living and predatory forms. They ca ...

, suborder

Trigynaspida Trigynaspida is a suborder of mites in the order Mesostigmata. There are more than 25 families and at least 90 described species in Trigynaspida. Families These 27 families belong to the suborder Trigynaspida: * Aenictequidae Kethley, 1977 * ...

. It is the only member of the genus ''Promegistus'' and the family Promegistidae (being placed in its original description in the family

Paramegistidae Paramegistidae is a family of mites in the order Mesostigmata Mesostigmata is an order of mites belonging to the Parasitiformes. They are by far the largest group of Parasitiformes, with over 8,000 species in 130 families. Mesostigmata includ ...

). It is endemic to Australia. Adults are believed to be

parasitic Parasitism is a close relationship between species, where one organism, the parasite, lives (at least some of the time) on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The ent ...

on large

carabid Ground beetles are a large, cosmopolitan family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North America and 2,700 in Europe. As of 2015, it is one of the 10 most species-rich animal fa ...

beetles, while young juveniles like other trigynaspids are thought to be free living.

References

Mesostigmata Acari families Monogeneric arthropod families {{Mesostigmata-stub