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

 
Crimson erineum mite
  crimson erineum mite

At only one tenth the width of a human hair in length, a crimson erineum mite (Aceria elongatus) is barely visible to the human eye unaided by magnification. Its claws, dorsal shield markings, and other identifying body features are not. Identification in the field is possible only by noting the properties of the abnormal growths (galls) it produces on its host.

Crimson erineum mite is a plant parasite infecting only sugar maple and possibly black maple. It is common in eastern United States and Canada. When injured by a mite, a leaf cell produces a small projection filled with colored fluid on the upper surface. Small patches of these are usually scattered over the leaf surface. They are greenish-white at first, soon becoming crimson or purplish. They reach their maximum extent, and are most noticeable, in summer. The infestation is sometimes abundant and can cause leaf distortion and premature leaf drop.

 

 

 

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
   

red velvet mite (Trombidium sp.)

blacklegged tick (Ixodes scapularis)

elm finger gall mite (Eriophyes parulmi)

maple spindle-gall mite (Vasates aceriscrumena)

  red velvet mite (Trombidium sp.)
    Photo by Kirk Nelson

 

 

 

 

 

 

 

           
Profile Photo Video      

     

alder beadgall mite (Phytoptus laevis)

 

American dog tick

finger gall of black cherry finger gall mite

chokecherry finger gall mite

crimson erineum mite

lime nail gall mite

maple bladdergall mite

red velvet mite (Trombidium sp.)

  Photo Photo

American dog tick (Dermacentor variabilis)

 
     

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)

 
Profile Photo Photo

crimson erineum mite (Aceria elongatus)

 
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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)

 
Profile    

maple spindle-gall mite (Vasates aceriscrumena)

 
     

maple velvet erineum gall mite (Aceria aceris)

 
Profile Photo Photo

red velvet mite (Trombidium sp.)

 
     

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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