File:Jacobs-ladder - Polemonium pulcherrimum with a velvet mite (Balaustium sp.) (48795421958).jpg

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NPS / Jacob W. Frank

Meet Yellowstone’s Balaustium (Erythraeidae) velvet mite. They are identified by two canon-like structures behind the eyes called urnulae, which deploy noxious chemicals to defend against ants. Members of this genus are generalist predators in all life stages. This commonly encountered species can also persist exclusively on pollen, which is why they are often seen roaming sidewalks and buildings for wind-blown pollen.
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Source Jacobs-ladder - Polemonium pulcherrimum with a velvet mite (Balaustium sp.)
Author Yellowstone National Park

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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.


This image was originally posted to Flickr by YellowstoneNPS at https://flickr.com/photos/80223459@N05/48795421958. It was reviewed on 14 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the Public Domain Mark.

14 March 2020

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Date/TimeThumbnailDimensionsUserComment
current06:19, 12 March 2020Thumbnail for version as of 06:19, 12 March 20204,327 × 6,491 (15.75 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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