Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Information, insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Ixodidae - Dermacentor andersoni - male

Ixodidae - Dermacentor andersoni - Male
Lake Fork of the Gunnison River, Gunnison County, Colorado, USA
May 11, 2006
Size: ~5-6 mm
Swept from grasses growing along the river road near the Gateway Bridge.

Micki, is a male dog tick, Dermacentor sp. i want to say this is a Dermacontor andersoni, but i cant say definetely. the other possibility would be Dermacentor variablis. D. variablis and D. andersoni unlike their relatives the Ixodes sp. do NOT transmit Lyme disease and are not really considered serious pests. However, D. variablis can transmit the microorganisms that cause tularemia and Rocky Mountain spotted fever. D. andersoni can transmit Colorado Mountain fever

Thanks, Omar. It kind of looks like one I found at this site:

(Last picture on the page)

Micki Killoran

this is 90% a D. andersoni because of your location. their ranges do not overlap. there are no guide pages for them yet so we will have to wait for an editor to create one

Guide page created
but before we put this image there, can you give a reference for the range of this species, Omar? Or an identifying characteristic? I have trouble telling this from D. variabilis (below).

Update: I found a range map here.

thanks Hannah. lets move this baby and make it the first

Done -
thanks for your help, Omar, and thanks for your contribution, Micki!

Well, it seems to fall in the range of that map. I have four more pictures of this specimen, if you think it would help. One might add something I'm not seeing.

Actually, on looking at the map more closely, it's right on the eastern edge. I can't be positive it IS in the range

Micki Killoran

There's a map with both ranges
here. Does that help? As Omar says, there's no overlap.

D. andersoni
Definitely the western most of the two. Thanks.

Micki Killoran

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.