Genus of spiders
Yllenus is a genus of jumping spiders that was first described by Eugène Louis Simon in 1868. Until 2019, it was considered a senior synonym of "Pseudomogrus", and many of the species formerly placed here were transferred to new genera "Logunyllus" and "Marusyllus" by Jerzy Prószyński in 2016.
"Y. arenarius" is peculiar in building silken nests under the sand surface of sandy dunes it inhabits.
Species.
As of  2019[ [update]] it contains eighteen species, found from central Europe to China:
References.
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