Hi Kevin,

You were pretty close with "yeast", but they are laboulbeniales fungi of the Class Laboulbeniomycetes. They are quite common on dung beetles from around the world, and also occur on a wide variety of other beetles.  A five volume work on the group was published by Thaxter from 1896-1931, but I think the group has been neglected by Mycologists over the last few decades . . . or perhaps half century!




B.D.Gill, Ph.D., F.R.E.S.

Editor-in-Chief, Biodiversity

Published by Biodiversity Conservancy International

and Taylor & Francis Journals 




On 2017-10-11 15:13, Floate, Kevin wrote:

Hi All:


My colleague, Wes Watson, has a project with Onthophagus taurus.  A number of the adult beetles he’s recovering are speckled with yellow spots.  Closer examination reveals what appears to be yeast(?) in the spots.  Have others made a similar observations on beetles?  Photos are attached.


Any clue as to what these are?


If you can help Wes out, I know he would appreciate it.  Please contact Wes directly at [log in to unmask]






Kevin Floate, Research Scientist

Insect Biocontrol | Lutte biologique aux insectes

Lethbridge Research Centre | Centre de recherches de Lethbridge
Agriculture and Agri-Food Canada | Agriculture et Agroalimentaire Canada
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Dr. Kevin Floate, Editor-in-Chief

The Canadian Entomologist