Until recently, [when?] the 28 species of Psithyrus were considered to constitute a separate genus. [1][2] They are a specialized socially parasitic lineage which parasitises the nests of …

Jan 19, 2024 · Females differ from those of all other Bombus in having the outer surface of the hind tibia convex and densely hairy (flat or concave and largely bare in other, pollen-collecting …

Authorities have long recognized two genera: Bombus, the nest-building bumblebees, and Psithyrus, the parasitic cuckoo bumblebees. In the first quarter of the 21st century the group …

The meaning of PSITHYRUS is a genus of large bees resembling bumblebees but lacking the pollen-collecting apparatus and the worker caste and being parasitic in the nests of bumblebees.

The Psithyrus species parasitizes bumblebees, which are always eusocial, by entering the nest before the first workers have emerged from their pupae. The Psithyrus queen kills the …

Mar 17, 2023 · Cuckoo bumblebees are obligate brood parasites of non- Psithyrus Bombus species, relying on their hosts to raise their offspring. Female Psithyrus identify a flourishing …

The new cuckoo bumble bee queen typically becomes active somewhat later in the year than does the true bumble bee queen, the reason being that, instead of initiating its own colony, the …

Mar 1, 2023 · The Cuckoo Bumble Bee Updated: 1st March 2023 Cuckoo bumble bees are obligate brood parasites of nest-building bumble bees of the genus Bombus. They belong to …

Cuckoo bumblebees are members of the subgenus Psithyrus in the bumblebee genus Bombus. Until recently, the 29 species of Psithyrus were considered to constitute a separate genus. …

Williams (1991 [pdf]) recommended recognising a single genus Bombus for all bumble bees, to include Psithyrus as a subgenus.