Abstract
In the present study, the mating behaviour of the velvet ant Nemka viduata (Pallas) (Mutillidae) is described both from field and laboratory observations. The whole pairing interaction, lasting around two hours, includes several behavioural phases. During pre-copula, the male seizes the female’s neck with his mandibles, and then starts to rhythmically stroke the prothorax of the female with his forelegs (this behaviour is also resumed after copulation) before curving his abdomen in order to couple the genital parts, including genital armatures (the male parameres remaining outside the female body); just prior to copulation, the female extrudes the sting, and immediately after copulation begins, she stridulates for 7–10 s, this behaviour is repeated when the pair separates. During copulation (lasting around two minutes), the male moves his antennae rhythmically, hitting the back of the female’s head with the scape. Generally, recently-mated males become aggressive towards females, but more tolerant after a few days. During the whole pairing act, females are held by the males’ mandibles, and in the field they are carried off in flight or by walking to a safe place to copulate. This would suggest that larger males, which can lift a wider range of female sizes, have a reproductive advantage, as indicated by data obtained on their load-lifting capacity with respect to the size distribution of females. A review of mating behaviour in mutillid wasps and comparisons with other lineages of aculeate and non-aculeate Hymenoptera are also given.
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Acknowledgments
We are indebted to John Alcock (Arizona State University, USA) and Anna Budriene (Institute of Ecology of Vilnius University, Lithuania) for their observations and critical reading of the manuscript. A grant from the DGES (CGL2006-02568) supported the study.
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Tormos, J., Asís, J.D., Polidori, C. et al. The Mating Behaviour of the Velvet Ant, Nemka viduata (Hymenoptera: Mutillidae). J Insect Behav 23, 117–127 (2010). https://doi.org/10.1007/s10905-009-9200-5
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DOI: https://doi.org/10.1007/s10905-009-9200-5