Minnesota Mites and Ticks

Subclass Acari

Acari is the subclass of arachnids that is characterized by having an unsegmented abdomen and generally four pairs of unjointed legs. The class includes mites and ticks.

There are about 50,000 known Acari species worldwide. There are 13 species of ticks known to occur in Minnesota. Only 3 are commonly encountered by humans.

chokecherry finger gall mite




Recent Additions

lime nail gall mite
  lime nail gall mite

In Minnesota, this specialized plant feeder is found only on American basswood and littleleaf linden, usually the lower leaves. In other parts of the country it is also found on lime trees. As it feeds on the leaf it causes the host plant to create finger-like galls on the upper leaf surface. The galls are unsightly but the infestation causes no harm to the host tree. This is a common species yet little is known of its life cycle. The adult spends the winter in a crevice in the bark or near a bud. The first galls appear in June.




Other Recent Additions

blacklegged tick (Ixodes scapularis)

elm finger gall mite (Eriophyes parulmi)

maple spindle-gall mite (Vasates aceriscrumena)









Profile Photo Video      

  Photo Photo

American dog tick (Dermacentor variabilis)


American dog tick

finger gall of black cherry finger gall mite

chokecherry finger gall mite

elm finger gall mite

lime nail gall mite

maple bladdergall mite


ash bead gall mite (Aceria fraxini)


ash flower gall mite (Aceria fraxiniflora)

Profile Photo Photo

black cherry finger gall mite (Eriophyes cerasicrumena)

Profile   Photo

blacklegged tick (Ixodes scapularis)


boxelder pouchgall mite (Eriophyes negundi)


brown dog tick (Rhipicephalus sanguineus)

Profile Photo  

chokecherry finger gall mite (Eriophyes emarginatae)


crimson erineum mite (Aceria elongatus)


elm finger gall mite (Eriophyes parulmi)


elm-leaf wart gall mite (Eriophyes ulmi)


hackberry witches’ broom mite (Eriophes celtis)


ironwood leaf gall maker (Eriophyes sp.)

Profile Photo Photo

lime nail gall mite (Eriophyes tiliae)

Profile Photo Photo

maple bladdergall mite (Vasates quadripedes)


maple spindle-gall mite (Vasates aceriscrumena)


maple velvet erineum gall mite (Aceria aceris)


winter tick (Dermacentor albipictus)


witches’ broom (Eriophyes sp.)














No Species Page Yet?

If you do not see a linked page for a arachnid in the list at left you can still upload a photo or video as an email attachment or report a sighting for that arachnid. Click on one of the buttons below and type in the common name and/or scientific name of the arachnid in your photo, video, or sighting. A new page will be created for that arachnid featuring your contribution.





Capitalization of Common Names

The 1997 version of Common Names of Insects and Related Organisms, published by the Entomological Society of America (ESA), contains only 9 spider species. Two of those are placed in the wrong family and four are unrecognized common names. The inadequate coverage of arachnids by the ICZN spurred the American Arachnological Society (AAS) to develop their own list, Common Names of Arachnids. While the ESA has no rule or guideline that addresses capitalization of common names, the AAS does. Capital letters should not be used unless 1) the name begins a sentence, then the first letter of the name should be capitalized; or 2) the common name begins with a proper name, and that proper name begins with a capital letter (place name or person’s last name). MinnesotaSeasons.com will adhere to the convention adopted by AAS.














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