Haelewaters, DannyBoer, PeterNoordijk, Jinze2015-12-152015Haelewaters, Danny, Peter Boer, and Jinze Noordijk. 2015. “Studies of Laboulbeniales (Fungi, Ascomycota) on Myrmica Ants: Rickia Wasmannii in the Netherlands.” Journal of Hymenoptera Research 44 (June 11): 39–47. doi:10.3897/jhr.44.4951.1314-2607http://nrs.harvard.edu/urn-3:HUL.InstRepos:23929298An important group of fungal insect parasites is the Laboulbeniales (Ascomycota). These are microscopic in size and live attached to the cuticle of their arthropod hosts. Rickia wasmannii is a common European species limited to the ant genus Myrmica (Hymenoptera, Formicidae). We present new records of R. wasmannii in the Netherlands on three host species: Myrmica ruginodis, M. sabuleti, and M. scabrinodis. Our data show a mass infection of M. sabuleti by R. wasmannii. The average parasite prevalence is 38% (n = 3,876). The prevalence was much lower on the other Myrmica species. So far, R. wasmannii infections have been found only on Myrmica species in the rubra-group and the scabrinodis-group. We provide possible explanations for this observation. To date, Rickia wasmannii is known on nine Myrmica species in sixteen European countries; an overview is included in tabulated form.en-USAnt-associated fungiectoparasitesFormicidaehost shiftLaboulbenialesparasite prevalenceJournal Article2015-09-09Danny Haelewaters, Peter Boer, Jinze Noordijk2015-12-1510.3897/jhr.44.4951