Belongs within: Microtrombidiidae.
Eutrombidium is a widespread genus of parasitengonine mites recorded from Eurasia, North America and Australia (Walter et al. 2009).
Characters (from Schweizer & Bader 1963): Adult with crista enlarged at midpoint around fine, hair-like sensilla; two eyes on each side, raised only slightly above the body surface on small basal plates; small, pointed naso present anterior to crista; idiosoma wide anteriorly, forming “shoulders”, tapered posteriorly with well-developed, oval opisthosomal plate; plumose idiosomal hairs all alike; palps strong, tibia with lateral claws and strong spines, tarsus long; legs densely hairy.
<==Eutrombidium Verdun 1909WY88
|--*E. trigonum (Hermann 1804)WY88 [=Trombidium trigonumWY88, Ottonia trigonaK01; incl. Pediculus rostratus Scopoli 1763SB63]
|--E. australiense Southcott 1993H98
|--E. canestriniiSB63
| |--E. c. canestriniiSB63
| `--E. c. minor Schweizer 1951SB63
|--E. frigidum Berlese 1910SB63
| |--E. f. frigidumSB63
| `--E. f. quadrispinum Schweizer 1951SB63
|--E. lebaroniWL09
|--E. lockleii Welbourn & Young 1988WY88
|--E. locustarumWY88
|--E. magnumWY88
|--E. orientaleWL09
`--E. trombidioides [=Ottonia trombidioides]WY88
*Type species of generic name indicated
References
[H98] Halliday, R. B. 1998. Mites of Australia: A checklist and bibliography. CSIRO Publishing: Collingwood.
[K01] Kulczyński, V. 1901. Arachnoideák [Arachnoidea]. In: Horváth, G. (ed.) Zichy Jenő Gróf Harmadik Ázsiai Utazása [Dritte Asiatische Forschungsreise des Grafen Eugen Zichy] vol. 2. Zichy Jenő Gróf Harmadik Ázsiai Utazásának Állattani Eredményei [Zoologische Ergebnisse der Dritten Asiatischen Forschungsreise des Grafen Eugen Zichy] pp. 311–369. Victor Hornyánszky: Budapest, and Karl W. Hierseman: Leipzig.
[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.
[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.
[WY88] Welbourn, W. C., & O. P. Young. 1988. Mites parasitic on spiders, with a description of a new species of Eutrombidium (Acari, Eutrombidiidae). Journal of Arachnology 16: 373–385.