---

at the moment C. gibbus is the only species listed in fauna europa, the other names being synonymised after Emilia Nartshuk went through the Paris collection and labelled all specimens of Cyrtus as gibbus, hence treating all forms as one highly variable taxon. However, this has never been officially published as far as I know. The genus is being revised by Christian Kehlmaier and he thinks that there might be two species mixed up here. so the name gibbus is correct for the European list as it stands but might need to be changed depending on the outcome of his revision.

thanks to Christian for the above information.