Image 1: A dish of millipedes under UV light. Most of the ones fluorescing in blue are Semionellus placidus, while the two fluorescing red are Pseudopolydesmus serratus. Red fluorescence under UV hasn’t been reported before in arthropods, to my knowledge.”

Photos by Derek Hennen. Check out his blog post for more field notes and details on identification!

Image 2: Semionellus placidus, photo by Derek Hennen (source)

 

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