The first Laboulbeniales (Ascomycota, Laboulbeniomycetes) from an American millipede, discovered through social media.

Laboulbeniales are highly specialized arthropod-associated fungi. The majority of the almost 2200 known species live on insects, although they also occur on other arthropod hosts. Recently, the number of Laboulbeniales associated with millipedes has increased considerably. Here we describe the first species of a Laboulbeniales fungus, , from an American millipede. The new species was initially discovered on a photo of (Say, 1821) from Ohio, USA, which had been shared on Twitter. A subsequent microscopic study of millipedes in museum collections in Denmark and France confirmed the discovery.