The Abdominal Morphology of Povilla adusta Navas (Polymitarcidae) and of Ephemeroptera in General

Abstract

AbstractThe morphology of the abdomen of the mayfly, Povilla adusta Navas (Polymitarcidae) has been studied from dissections of muscles and nerves in male and female imagines and in a female nymph and a number of apparently very primitive traits have been disclosed. The findings have been compared to similar structures in other mayflies and, as a result, a revised interpretation of the genital and postgenital segments of Ephemeroptera is proposed.