I've found this very little fungi(around 3 µm) on an antennal seta of an Isopoda (Trichoniscus pusillus
). It is the second time I encounter such thing; the first time was on a setae of a ground beetle. I first though it was an egg, but this time I was able to get a pretty good view and I know think it is very small fungi (most likely trichomycetes), but I'm still unsure.
Same thing on a ground beetle: