Distribution of the Western Palaearctic representatives of the Bolbelasmus unicornis species group: yelow circles = B. unicornis; orange circles = B. keithi Miessen & Trichas, 2011; pale red circles = B. nireus; dark red circles = B. makrisi Miessen, 2011; purple circles = B. zagrosensis Sommer, Hillert, Hrůzová & Král, 2021; white circle = record of a specimen tentatively assigned to B. nireus by Krikken (1977), but in need of revision (it could be B. zagrosensis).

 
 
  Part of: Juřena D (2023) Addenda and corrigenda: Juřena D (2022) A critical review of the distribution of the endangered European earth-borer beetle Bolbelasmus unicornis (Coleoptera, Geotrupidae), with new records from 13 countries and observations on its bionomy. ZooKeys 1105: 1–125. https://doi.org/10.3897/zookeys.1105.81474. ZooKeys 1148: 209-227. https://doi.org/10.3897/zookeys.1148.100501