Bombus caliginosus

Bombus caliginosus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Apidae
Genus: Bombus
Subgenus: Pyrobombus
Species:
B. caliginosus
Binomial name
Bombus caliginosus
Frison, 1927

Bombus caliginosus, the obscure bumblebee, is a species of bumblebee native to the West Coast of the United States, where its distribution extends from Washington through Oregon to Southern California.[2]

Description

The obscure bumblebee is very similar to the yellow-faced bumblebee (B. vosnesenskii), and the two can only be definitively told apart by the structure of the male genitalia.[3] The obscure bumblebee tends to have longer hairs, however, and yellow hairs are found on the underside of the abdomen, where B. vosnesenskii has only black hairs on the underside.[4]

Ecology

This bumblebee has been noted on 19 families of plants. The workers are most often seen on Fabaceae, the legume family, while queens are most often seen on Ericaceae, the heath family, and males have been noted most often on Asteraceae, the aster family. Common plants visited by the workers in a sample included ceanothus, thistles, sweet peas, lupines, rhododendrons, Rubus, willows, and clovers. Queens emerge from hibernation in late January, the first workers appear in early March, and the males follow by the end of April. The colony dissolves in late October, when all the inhabitants die except the new queens.[5]

References

  1. ^ Hatfield, R.; Jepsen, S.; Thorp, R.; Richardson, L.; Colla, S. (2014). "Bombus caliginosus". IUCN Red List of Threatened Species. 2014: e.T44937726A69000748. doi:10.2305/IUCN.UK.2014-3.RLTS.T44937726A69000748.en. Retrieved 20 November 2021.
  2. ^ DiscoverLife species map
  3. ^ Ebeling, R. (2002). Chapter 9, part 2: Pests Attacking Man and His Pets. Archived 2015-06-19 at the Wayback Machine Urban Entomology. UC Riverside.
  4. ^ McFrederick, Q.S. Guide to the Bombus of San Francisco. The Bee Inventory Plot. San Francisco State University.
  5. ^ Thorp, R. T.; et al. (1983). Bumble Bees and Cuckoo Bumble Bees of California (PDF). Bulletin of the California Insect Survey Volume 23. pp. 33–35. ISBN 0-520-09645-2. Retrieved 2013-07-29.

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