Comparative Morphology of Epithemata (Polar Chorionic Structures) in the Eggs of Ephemerella ignita (Ephemeroptera: Ephemerellidae)

@article{Gaino1992ComparativeMO,
  title={Comparative Morphology of Epithemata (Polar Chorionic Structures) in the Eggs of Ephemerella ignita (Ephemeroptera: Ephemerellidae)},
  author={E. Gaino and E. Bongiovanni},
  journal={Transactions of the American Microscopical Society},
  year={1992},
  volume={111},
  pages={255-265}
}
The eggs of the mayfly Ephemerella ignita (Ephemeroptera: Ephemerellidae) are characterized by a polar adhesive structure, the epithema. The epithema prevents egg drift following deposition in water by extending a network of threads. Mated females lay an aggregate of eggs that is attached to the last abdominal sternites. Within the aggregate, eggs with differently shaped epithemata are arranged in a well-defined pattern. Three types of eggs were defined by three types of epithemata, namely… Expand
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