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This paper describes the first three cases in which male crickets monopolize females by means of mating plugs. The origin of the plugs vary among the cases (i.e., they are not homologous). Female monogamy is assured by the permanent presence of the plug attached to their genitalia after first mating, while males are potentially polygamous. The presence of an additional clasping structure and the occurrence of forced copulation are also described. Este trabalho descreve os primeiros três casos em que grilos machos monopolizam suas fêmeas através de plugues de acasalamento. A origem dessas estruturas varia entre os casos (i.e., não há homologia entre as mesmas). A monogamia feminina é assegurada pela presença permanente do plugue de acasalamento aderido a sua genitália após a primeira cópula, enquanto que os machos são potencialmente poligâmicos. Descrevem-se ainda a presença de clásper adicional e a ocorrência de cópulas forçadas

Female monopolization and paternity assurance in South American crickets (Orthoptera, Grylloidea): mating plugs, extra claspers and forced copulation