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Cooperative breeding of animals is vulnerable to social parasitism, in which parasites usurp the labors of the hosts. In social hymenopterans, social parasitism has evolved numerous times independently, and the process by which it has arisen is thus a major question in evolutionary biology. It is generally thought that parasites originate from their hosts via sympatric speciation, and some actual...
Ants have distinct morphological castes (queens and workers), but aberrant queen-worker “intercastes” occasionally occur, both in wild and laboratory conditions. Intercastes are rare, however, such novel phenotypes may have evolutionary significance. Their morphology is highly variable in any given species, providing valuable information about the integration of queen traits (e.g. ocelli, wings, complex...
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