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

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Abstract
The 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.

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