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- License: CC0 1.0 Universal Kaelygon 2024
- **Lacertocyon similarities and differences in comparison to bottlenose dolphins**
- **Males**:
- Similarities
- - Penis that is able to completely retract inside the genital slit
- - Internal testes
- - Urine and sperm are carried via urethra
- - Retractor muscle, pelvic bone, prostate
- Differences
- - Slightly different shape as the species evolved to be more terrestrial
- - Configuration of the retractor muscle
- **Females**:
- Similarities
- - Urogenital slit contains vagina, urinary orifice and other parts commonly found in mammals
- - Similar though less pronounced annular folds as the species became less aquatic
- - Uterine horn, ovaries
- Differences
- - In both sexes, the anus is near the root of the tail, outside the urogenital slit.
- - Six teats are located along the underbelly, starting below the rib cage down to lower abdomen
- These are remnant from the species semi-aquatic ancestors.
- There has been some changes, mostly in shape and configuration.
- Since internal reproductive organs weren't disadvantageous even after they transitioned back to terrestrial life, theses trait got passed down through evolution since Paleocene.
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