What does determine gonad weight in the wild kissing bug Mepraia spinolai

female fecundity increases with body size in a variety of insects, but it is unknown if this generalization applies for kissing bugs. in this study, we evaluate whether gonad weight in the bloodsucking insect mepraia spinolai correlates with body size, or determined by nutrition or developmental time. we found that the investment on reproductive tissue correlates positively and significantly with body size and with the amount of ingested blood by female insects along their lifespan. total molting time did not significantly affect gonad weight. we suggest that under optimal feeding conditions m. spinolai females could express their maximum reproductive potential.