Belongs within: Eleutherengonides.
Eustigmaeus is a cosmopolitan genus of parasitic or bryophagous mites (Faraji et al. 2007). They are globular stigmaeids with the dorsum broadly covered by three unpaired shields, with four pairs of setae on the prodorsal and six pairs on the opisthosomal shields.
Characters (from Faraji et al. 2007): Dorsum with 3 shields, prodorsal shield with 4 pairs of setae and usually one pair of eyes, opisthosomal shield with 6 pairs of setae and suranal shield with 2 pairs of setae; humeral setae c2 situated on triangular shields, displaced to a ventral or ventrolatral position; dorsal shield generally sculptured or ornamented; legs shorter than idiosoma; gnathosoma partly covered by overhanging prodorsum; palp 5-segmented, with a tridentate, terminal eupathidium; primary claw on palptibia well developed, with a smaller accessory claw at its base; chelicerae not joined together; venter with 2 or 4 endopodal shields which may be united or divided midventrally; aggenital area with 1 to 3 pairs setae and pseudoanal covers with 3 to 4 pairs of setae.
<==Eustigmaeus Berlese 1910 [incl. Ledermuelleria Oudemans 1923]FUB07
|--*E. kermesinus (Koch 1841) [=Stigmaeus kermesinus]FUB07
|--E. abseus Dogan 2005FUB07
|--E. anauniensis (Canestrini 1889)FUB07 (see below for synonymy)
|--E. arcticus (Wood 1972) [=Ledermuelleria arctica; incl. E. mineus Barillo 1989]FUB07
|--E. arcuataTG96
|--E. bali Dogan & Ayyildiz 2003FUB07
|--‘Ledermuelleria’ brevisetosa Wood 1966SL71
|--E. brevivestitus Kazmierski & Donczyk 2003FUB07
|--E. chilensis (Chaudhri 1965)FUB07
|--E. clavatus (Canestrini & Fanzago 1876) [incl. Raphignathus sphagneti Hull 1918]FUB07
|--‘Ledermuelleria’ clavigera Wood 1966SL71
|--E. collarti (Cooreman 1955)FUB07
|--E. coronaria (Kuznetzov 1977)FUB07
|--‘Ledermuelleria’ corticola Wood 1966SL71
|--‘Ledermuelleria’ distincta Wood 1966SL71
|--‘Ledermuelleria’ dumosa Wood 1966SL71
|--E. erciyesiensis Dogan, Ayyildiz & Fan 2003FUB07
|--E. erzincanensis Dogan 2005FUB07
|--E. erzurumensis Dogan 2005FUB07
|--E. etruscus (Berlese 1910)FUB07
|--E. formosus Kazmierski & Donczyk 2003FUB07
|--E. frigidaWL09
|--‘Ledermuelleria’ granulosa Wood 1966SL71
|--E. ioanninensis Kapaxidi & Papadoulis 1999FUB07
|--E. jiangxiensis Hu, Chen & Huang 1996FUB07
|--E. johnstoni Zhang & Gerson 1995FUB07
|--E. kauaiensisS01
|--E. longisetosus (Willmann 1956)FUB07
|--‘Ledermuelleria’ manapouriensis Wood 1966SL71
|--E. microsegnis (Chaudhri 1965)FUB07
|--E. mixta (Wood 1966) [=Ledermuelleria mixta]H98
|--E. myrtea (Chaudhri 1965)FUB07
|--E. nasrinae Khanjani & Ueckermann 2002KU02
|--E. ornatus Ueckermann & Meyer 1987S96
|--E. ottavii (Berlese 1910)FUB07
|--E. oudemansi (Thor 1930)FUB07
|--‘Rhaphignathus’ patrius Berlese 1885SB63 [=Ledermuelleria patriusSB63; incl. Raphignathus patrius var. brevipalpeS22]
|--E. philippicaKU02
|--E. pinnatus (Kuznetsov 1977)FUB07
|--E. plumifer (Halbert 1923)FUB07
|--E. pulchellus (Thor 1930)FUB07
|--E. rhodomela (Koch 1841) [incl. E. fani Dogan 2005]FUB07
|--E. schusteri (Summers & Price 1961)FUB07
|--E. sculptus Dogan, Ayyildiz & Fan 2003FUB07
|--E. segnis (Koch 1836)FUB07 [=Caligonus segnisKU02, *Ledermuelleria segnisSB63]
|--‘Ledermuelleria’ simplex Wood 1966SL71
|--E. truncates (Halbert 1923)FUB07
|--E. turcicus Dogan & Ayyildiz 2003FUB07
|--E. vacuus Dogan 2005FUB07
`--E. variolatus Barilo 1987FUB07
Eustigmaeus anauniensis (Canestrini 1889)FUB07 [incl. E. granulosus Willmann 1951FUB07, E. kentingensis Tseng 1982FUB07, Raphignathus pectinatus Ewing 1917FUB07, E. pectinatusKU02]
*Type species of generic name indicated
References
[FUB07] Faraji, F., E. A. Ueckermann & F. Bakker. 2007. First record of Eustigmaeus jiangxiensis Hu, Chen and Huang (Acari: Stigmaeidae) from France with a key to the European species of Eustigmaeus Berlese, 1910. International Journal of Acarology 33 (2): 145–151.
[H98] Halliday, R. B. 1998. Mites of Australia: A checklist and bibliography. CSIRO Publishing: Collingwood.
[KU02] Khanjani, M., & E. A. Ueckermann. 2002. The stigmaeid mites of Iran (Acari: Stigmaeidae). International Journal of Acarology 28 (4): 317–339.
[S22] Schweizer, J. 1922. Beitrag zur Kenntnis der terrestrischen Milbenfauna der Schweiz. Verhandl. Naturf. Ges. Basel 33: 23–112, 4 pls.
[SB63] Schweizer, J., & C. Bader. 1963. Die Landmilben der Schweiz (Mittelland, Jura und Alpen): Trombidiformes Reuter, mit 217 Arten und Unterarten und 193 Originalzeichnungen. Denkschriften der Schweizerischen Naturforschenden Gesellschaft [Mémoires de la Société Helvétique des Sciences Naturelles] 84 (2): i–vi, 209–378.
[SL71] Spain, A. V., & M. Luxton. 1971. Catalog and bibliography of the Acari of the New Zealand subregion. Pacific Insects Monograph 25: 179–226.
[S96] Swift, S. F. 1996. Biodiversity of raphignathoid mites in the Hawaiian islands (Acariformes: Prostigmata). In: Mitchell, R., D. J. Horn, G. R. Needham & W. C. Welbourn (eds) Acarology IX vol. 1. Proceedings pp. 339–341. Ohio Biological Survey: Columbus (Ohio).
[S01] Swift, S. F. 2001. The leg chaetotaxy of Caligonellidae (Prostigmata: Raphignathoidea). In: Halliday, R. B., D. E. Walter, H. C. Proctor, R. A. Norton & M. J. Colloff (eds) Acarology: Proceedings of the 10th International Congress pp. 242–249. CSIRO Publishing: Melbourne.
[TG96] Tolstikov, A. V., E. V. Gordeeva, A. D. Petrova & D. G. Fyodorov-Davydov. 1996. Contributions to the knowledges of the polygonal tundra mite community. In: Mitchell, R., D. J. Horn, G. R. Needham & W. C. Welbourn (eds) Acarology IX vol. 1. Proceedings pp. 615–619. Ohio Biological Survey: Columbus (Ohio).
[WL09] Walter, D. E., E. E. Lindquist, I. M. Smith, D. R. Cook & G. W. Krantz. 2009. Order Trombidiformes. In: Krantz, G. W., & D. E. Walter (eds) A Manual of Acarology 3rd ed. pp. 233–420. Texas Tech University Press.