It had a dark body with a slight blue tint, although the median fins were lemon yellow.

The scales were strongly crosshatched, and the dorsal fin had a dark stripe along its edge.

The species’ exact diet is not known, but other poeciliids typically eat insect larvae and other small invertebrates.

The fish were live bearing and were known to give birth to a few dozen young at a time.

The species was threatened by reduced spring flows and pollution, including sprayed herbicide along the river and introduced fish (Gambusia affinis) and plants (Colocasia esculenta).