From what ancestral group is the Psithyrus lineage believed to have evolved?
Answer
Solitary bee ancestors
Evolutionary biology suggests that brood parasitism in bees, specifically within the Psithyrus group, arose from ancestors that lived solitary lives. This evolutionary trajectory involved a gradual shift where a female would lay eggs in the nests of others without authorization, eventually escalating over generations into the high-stakes, direct-takeover strategy seen today. This contrasts with other parasitic groups that may have evolved from social ancestors.
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