Rivulidae

Rio pearlfish

Cynolebias elegans

• Tropical
• Southern Hemisphere
• Regional distribution
• Freshwater fish
• South America
• Fusiform
• Small
• Tropical fish

Nematolebias whitei, the Rio pearlfish, is a species of killifish from the family Rivulidae. It is endemic to Brazil where it is found in the Laguna de Araruama basin, Das Ostras River basin and in coastal plains in the vicinity of the mouth of São João River in Rio de Janeiro State. It was introduced to California in the 20th Century but they did not become established there.