In Acyrthosiphon pisum the tibial plaques, through which sexual pheromones are released, form one of the distinguishing features of the male-ovipara bixesual pair. They are very abundant in oviparae but completely absent in both males and virginoparae. In a third, rare, category of females which bear a mixed ovary containing both viviparous and oviparous ovarioles, these plaques may still be present but in reduced numbers. A correlation between the number of tibial plaques and that of viviparous and oviparous ovarioles in the ovaries has been found, suggesting that the morphogenesis of this character may be under ovarian control.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.