Mesostigmata
A Mesostigmata san en order faan Koonkern (Arachnida).

Onerordern 
 Monogynaspida
 Infraordern: Gamasina – Uropodina

 Sejina
 Auerfamilin: Heterozerconoidea – Sejoidea

 Trigynaspida
 Infraordern: Antennophorina – Cercomegistina

Enkelt slacher 
Monogynaspida
 Gamasina
 Dermanyssoidea
 Varroidae
 Varroa
 Varroamel (Varroa destructor)

Luke uk diar 

Koonkern