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Abstract
The eggs of 2 mayflies, Habrophlebia fusca and H. consiglioi (Ephemeroptera : Leptophlebiidae) were observed with scanning and transmission electron microscopes. The external surface of the eggs in both species had longitudinally oriented costae. The chorion of H. fusca had different structures in its costal and intercostal zones. Three distinct layers could be recognized: an inner layer close to the vitelline coat, consisting of electron-dense lamellae perpendicular to the egg surface; an intermediate layer, consisting of loosely structured fibrillar material; and an outer highly electron-dense layer, consisting of 2 separate laminae, divided by an electron-transparent line. In the egg of H. fusca, the costal area of the chorion shows a columnar structure. The columns merge distally to create wide chambers. This organization has been observed with the SEM in H. consiglioi as well. The chambers are interconnected and communicate with the exterior through openings along the costal edges. Masses of mucus-like substance are present both in the chambers and outside the chorion; they show fibrillar material and electron-dense bodies with a paracrystalline structure.
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