Intromittent organ
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- Presence of Penis in the European Quail Coturnix C
- Fish Reproduction and Development
- Natural Breakage of the Very Long Intromittent Organ of the Seed Bug Lygaeus Simulans (Heteroptera: Lygaeidae)
- A Preliminary Note of Egg-Case Oviparity in a Devonian Placoderm Fish
- Special Traits of Spiders Facilitate Studies of Sperm Competition and Cryptic Female Choice
- External Genitalia - Invagination in Body Wall Where Phallus Can Be Protected - Usually a Ventral Invagination Between Segments 9 and 10