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The article presents a study which analyzed the breeding habitat and natural history notes of the toad Melanophryniscus pachyrhynus in southern Brazil. It claims that the toad specie belongs to the M. tumifrons group, which are mainly present in South American countries, Brazil, Argentina and Uruguay. It cites that the calling behaviour of the M. pachyrhynus is similar to that of the male M. devincenzii and male M. orejasmirandai. It states that the M. pachyrhynus exhibited diurnal and nocturnal calling activity.