Marbled Swordtail
Xiphophorus meyeri
- Extinct in the wild
- Card rarity: Mythic
- Fish

The marbled swordtail is a species of freshwater fish in the family Poeciliidae. It was endemic to the Rio Salado system in Coahuila, northeastern Mexico. It was restricted to springs, connected creeks and pools in waters with a pH slightly above neutral and temperatures of 16–26 °C (61–79 °F), with captive studies indicating that the optimum temperature is around 24 °C (75 °F).
Classification
- Class
- Actinopterygii
- Order
- Cyprinodontiformes
- Family
- Poeciliidae
- Genus
- Xiphophorus