Phallostethidae

Priapium fish

Neostethus thessa

• Tropical
• Regional distribution
• Southeast Asia
• Elongated
• Tropical fish

Neostethus thessa, locally known as bolinao, is a species of freshwater priapium fish endemic to Lake Mainit, Mindanao, Philippines. It is classified as Endangered by the IUCN Red List of Threatened Species due to its highly restricted range which is threatened by pollution and the introduction of invasive species of fish.