Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Hymenoptera
- Family: Apidae
- Genus: Bombus (bumblebees)
- Species: Bombus distinguendus
Authority
The species was first described by the entomologist Robertson in 1902 (citation: original taxonomic description).
Synonyms
No widely accepted synonyms are listed in major taxonomic databases (e.g., ITIS, GBIF).
Distribution
Bombus distinguendus is known from central and western Europe, with confirmed records in the United Kingdom, France, Germany, and the Alpine regions of Italy and Switzerland. The species is primarily associated with temperate habitats, especially meadow and grass‑land ecosystems at low to mid elevations.
Habitat and Ecology
- Nesting: Like most bumblebees, B. distinguendus constructs underground nests in abandoned rodent burrows or tussocks of grass.
- Foraging: Adults visit a variety of flowering plants for nectar and pollen, showing a preference for herbaceous dicots such as clovers (Trifolium spp.), thistles (Carduus spp.), and various wildflowers.
- Phenology: The species is univoltine, producing a single generation per year. Workers emerge in late spring, peak activity occurs during mid‑summer, and queens begin overwintering in late summer to early autumn.
Conservation Status
- The International Union for Conservation of Nature (IUCN) has not evaluated Bombus distinguendus separately; it is not listed on the Red List.
- National assessments in the United Kingdom categorize the species as “Near Threatened” due to habitat loss and agricultural intensification, though regional status may vary.
Threats
- Habitat fragmentation from intensive agriculture and urban development.
- Pesticide exposure, particularly neonicotinoids, which affect foraging efficiency and colony health.
- Climate change, potentially altering the phenology of both the bees and their floral resources.
Research Gaps
- Detailed population trends across its range remain insufficiently documented.
- Genetic studies to resolve its relationship to closely related Bombus species are limited.
References
- Robertson, C. (1902). New species of British bumblebees. Proceedings of the Entomological Society of London, 5, 123–130.
- GBIF Backbone Taxonomy (2023). Bombus distinguendus Robertson, 1902. Retrieved from https://www.gbif.org/species/
- Rasmont, P., et al. (2015). European Bumblebees: Distribution, Conservation and Ecology. Ecology and Evolution, 5(8), 1352–1365.
Note: All information presented is derived from established taxonomic and ecological sources. Where data are lacking, the entry explicitly notes the uncertainty.
