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Species Bombus sonorus - Sonoran Bumble Bee

Bombus who? - Bombus sonorus Sonoran Bumble Bee? - Bombus sonorus Large bumble bee with lots of yellow - Bombus sonorus Reality Check: Is this the Sonoran Bumble Bee, Bombus sonorus? - Bombus sonorus - female large bumble bee - Bombus sonorus - male Bombus  - Bombus sonorus Bumblebee - Bombus sonorus bee, yellow & black - Bombus sonorus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
No Taxon (Anthophila (Apoidea) - Bees)
Family Apidae (Cuckoo, Carpenter, Digger, Bumble, and Honey Bees)
Subfamily Apinae (Honey, Bumble, Long-horned, Orchid, and Digger Bees)
Tribe Bombini (Bumble Bees)
Genus Bombus (Bumble Bees)
No Taxon (Subgenus Thoracobombus)
Species sonorus (Sonoran Bumble Bee)
Synonyms and other taxonomic changes
Often treated as a subspecies of Bombus pensylvanicus
Explanation of Names
Bombus sonorus Say, 1837
Similar to the very closely related pensylvanicus, but in sonorus the dorsum of the thorax is yellow posteriorly and there is a distinct black interalar band, whereas in typical pensylvanicus the dorsum of the thorax is largely or entirely black posteriorly. Unlike B. fervidus, T4 of females is black.
sw US from CA-TX, north to southern NV and southwestern UT; south to southern Mexico. Widespread in southern California but more local in northern California where best known from the Central Valley and adjacent valleys in the foothill zone (see below for status). The common bumble bee of the Sonoran and Chihuahuan deserts.
Mostly low elevations including deserts and cultivated valleys.
Feb-Oct (BG data)
Strongly associated with sunflowers (Helianthus annuus) but also visits many other plants, notably nightshades (Solanum) and globe mallows (Sphaeralcea). The Hosts section of its Discover Life species page lists known floral associations based on specimen records and images.
Has declined severely in its northern California range and no longer detected at sites where it was abundant in the 1990s. Still regularly found in the Sonoran and Chihuahuan deserts but number vary greatly between years depending, reflecting in part availability of its favorite host plants whose bloom depends on irregular rainfall. Texas Parks & Wildlife considers this to be a "Species of Greatest Conservation Need" (SGCN) (1)
Print References
Warriner, M.D. (In press). Bumble bees (Hymenoptera: Apidae) of Texas: historical distributions. Southwestern Naturalist.
Internet References
Info - Map - Discover Life