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Bombus vosnesenskii
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Apidae
Genus: Bombus
Subgenus: Pyrobombus
Species: B. vosnesenskii
Binomial name
Bombus vosnesenskii
Radoszkowski, 1862

Bombus vosnesenskii, the yellow-faced bumblebee, is distributed through western North America. This species grows to 1–2 centimetres (0.4–0.8 in) long, with queen being larger than the workers.[1] B. vosnesenskii is characterized by the yellow coloration of the head pile, the mostly black thorax and abdomen, a single yellow thoracic stripe on the lower abdomen, and blackish wings.[2]

Life cycle

The overwintering queen first appears during spring and establishes underground colonies. After laying her first brood she, and the workers, will incubate the cluster until the adults emerge. The queen and workers use thermoregulation to incubate the cluster. The fuel for the bumblebee's thermoregulation during incubation is derived from honey (when the bumblebee is not foraging), nectar, and pollen.[3] Late in the season males and young queens leave the nest and mate. While old males, queens, and workers die. The new queens overwinter and the cycle continues. [1]


B. vosnesenskii', like most bumblebees, use thermoregulation to maintain a stable body temperature several degrees above the ambient temperature. At rest, bumblebees have temperatures close to ambient temperature. To generate power for flight, bumblebees need to raise the temperature of the flight muscles to above

  1. REDIRECT Template:Convert/°C.[4] The route of heat exchanged in B. vosnesenskii is regulated by the heat transfer from the thorax to the abdomen by the variations of hemolymph flow in the petiole, the narrow region between the abdomen and thorax. At low ambient temperature, the hemolymph flows from the thorax and abdomen simultaneously. As a result, the counter-current exchange of heat in the petiole retains most of the energy in the thorax. When ambient temperature is high, the flow between the thorax and abdomen alternate. The amount of counter-current heat exchange in the petiole is reduced and allows hemolymph to transfer large amounts of heat from the thorax to the abdomen.[5]




Up to date as of January 23, 2010
(Redirected to Bombus (Pyrobombus) vosnesenskii article)

From Wikispecies


Main Page
Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Cladus: Pterygota
Cladus: Metapterygota
Cladus: Neoptera
Cladus: Eumetabola
Cladus: Endopterygota
Superordo: Hymenopterida
Ordo: Hymenoptera
Subordo: Apocrita
Superfamilia: Apoidea
Familia: Apidae
Subfamilia: Apinae
Tribus: Bombini
Genus: Bombus
Subgenus: B. (Pyrobombus)
Species: Bombus (Pyrobombus) vosnesenskii


Bombus (Pyrobombus) vosnesenskii Radoszkowski, 1862



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