The Holothyrida are a small order of mites in the superorder Parasitiformes. No fossils are known. With body lengths of more than 2 mm they are relatively large mites, with a heavily sclerotized body. They mainly feed on the body fluids of dead arthropods. This was possibly the common way of feeding for ticks before they adapted for feeding on the blood of live animals.
Although only 25 species are currently described, many others have been collected.
The order has a Gondwanan distribution. They are likely the sister group to Ixodida (ticks).
Allothyridae van der Hammen, 1972 — Australia
Allothyrus van der Hammen, 1961Allothyrus australasiae (Womersley, 1935)Allothyrus constrictus (Domrow, 1955)Australothyrus van der Hammen, 1983Australothyrus ocellatus van der Hammen, 1983Holothyridae Thorell, 1882
Sternothyrus Lehtinen, 1995Sternothyrus braueri (Thon, 1905) — SeychellesLindothyrus Lehtinen, 1995Lindothyrus elongatus Lehtinen, 1995 — Lord Howe IslandLindothyrus rubellus Lehtinen, 1995 — New CaledoniaIndothyrus Lehtinen, 1995Indothyrus greeni Lehtinen, 1995 — Sri LankaHaplothyrus Lehtinen, 1995Haplothyrus expolitissimus (Berlese, 1924) — New CaledoniaHaplothyrus hyatti Lehtinen, 1995 — unknown localityHolothyrus Gervais, 1842 — MauritiusHolothyrus coccinella Gervais, 1842Holothyrus legendrei Hammen, 1983Hammenius Lehtinen, 1981Hammenius armatus (Canestrini, 1897) — Tamara Island (Aitape): New GuineaHammenius berlesei (Lehtinen, 1995) — New GuineaHammenius braueri (Thon, 1906)Hammenius fujuge Lehtinen, 1981 — New Guinea (Central District, Oro Province)Hammenius grandjeani (Hammen, 1961) — Mount Bosavi: New GuineaHammenius holthuisi van der Hammen, 1983Hammenius ingii Lehtinen, 1981 — New GuineaHammenius insularis Lehtinen, 1995 — Louisiade Archipelago: New GuineaHammenius longipes (Thorell, 1882) — Fly River, New Guinea (?)Hammenius mendi (Lehtinen, 1995) — Strickland River: New GuineaHammenius montanus Hammen, 1983 — Irian JayaHammenius niger (Thon, 1906)Neothyridae Lehtinen, 1981
Diplothyrus Lehtinen, 1999Diplothyrus schubarti Lehtinen, 1999Neothyrus Lehtinen, 1981Neothyrus ana Lehtinen, 1981
