I have seen such spots on numerous dung beetles. Nor sure what they are, but I doubt they simply dirt sticking to the specimens. They are attached firmly to the cuticle and in some specimens they must be attached when the specimen is still teneral as they leave a depression on the cuticle when detached. I am also interested to find out about what they are.
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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