Plural of aedeagus; the male reproductive structures found in insects and certain other arthropods.
The plural form of 'aedeagus', following Latin masculine second-declension noun pluralization. From Greek 'aedoeagus', this term has been standard in entomology since specimen classification became systematic.
The shapes, sizes, and details of aedeagi are wildly diverse—from cork-screw spirals to elaborate hooks and barbs—and scientists use these differences like a visual key to unlock which species is which when insects look almost identical to our eyes.
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