Bolbelasmus

Densely forested montane areas; soil-dwelling. Specific habitat preferences for some species have been quantified using GIS environmental variables.

Holarctic and Oriental regions; Europe (Central, Eastern, and Southeast), eastern and southeastern Asia including southern China (Yunnan, Guangdong), northern Thailand, Myanmar, Taiwan, Korea, Japan, and Iran.

Adults of some species are active from late dusk to midnight; seasonal dynamics documented for B. unicornis in the Pannonian Basin region.

Adults of some species are nocturnal, flying approximately 30 cm above the forest floor from late dusk to midnight. Adults sporadically attracted to light; specimens occasionally collected using baited traps or flight interception traps.

Bolbelasmus unicornis is of special conservation significance and is included in Annexes II and IV of the EU Habitat Directive. The species B. horni was depicted in the UC Davis Arboretum's Nature's Gallery ceramic mosaic mural as part of a public art and donor recognition program.

• Bolboceratinae (subfamily)Bolbelasmus can be distinguished from other bolboceratine genera by its exceptionally wide geographic distribution across both Holarctic and Oriental regions, whereas related genera typically have more restricted ranges.

• scarabaeoidea
• earth-borer beetle
• soil-dwelling
• nocturnal
• conservation
• EU Habitat Directive

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• Current and predicted distribution of the rare and threatened beetle Bolbelasmus (Bolbelasmus) unicornis (Coleoptera: Geotrupidae) in Serbia
• Bolbelasmus (Bolbelasmus) zagrosensis (Coleoptera: Scarabaeoidea: Bolboceratidae), a new species from Iran, along with an updated key to the western Palaearctic species of the subgenus
• A systematic review of the genus Bolbelasmus Boucomont (Coleoptera, Geotrupidae, Bolboceratinae) from Indochina and surrounding areas
• 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
• Figure 1 from: 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
• Figure 2 from: 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
• Figure 1 from: 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
• Figure 3 from: 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
• 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
• Figure 21 from: 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
• Results of ongoing mapping of Bolbelasmus unicornis (Schrank, 1789) (Coleoptera: Geotrupidae: Bolboceratinae): the second addendum to the biogeographical study from 2022, with a literature review and new records of B. keithi Miessen & Trichas, 2011 and B. nireus (Reitter, 1895)
• Figure 12 from: 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
• Figure 18 from: 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
• Figure 11 from: 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
• Figure 19 from: 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
• A new species of Bolbelasmus (Coleoptera, Bolboceratidae) from Guangdong Province, China.