Holothyrida
A Holothyrida san en order faan Koonkern (Arachnida). Jo like Tegen (Ixodida).

Familin an sköölen 
 Allothyridae
 Allothyrus – Australothyrus

 Holothyridae
 Acaricesa – Hammenius – Haplothyrus – Holothyrus – Indothyrus – Leiothyrus – Lindothyrus – Sternothyrus

 Neothyridae
 Caribothyrus – Diplothyrus – Neothyrus

Luke uk diar 

Koonkern