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New Fish Species Discovered in Colombian Amazon: Priocharax rex

12/8/2025

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Summary

Story summary

Priocharax rex is a newly identified fish in the Colombian Amazon, about 0.8 inches long, with a round skin flap between its pelvic fins, a first for its genus.
Priocharax rex, found in a blackwater forest stream near San Rafael, Colombia, displays juvenile traits such as a larval pectoral fin and reduced bones.
Habitat vulnerability makes conservation crucial.
Findings are published in Zootaxa.

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Story summary

Priocharax rex is a newly identified fish in the Colombian Amazon, about 0.8 inches long, with a round skin flap between its pelvic fins, a first for its genus.
Priocharax rex, found in a blackwater forest stream near San Rafael, Colombia, displays juvenile traits such as a larval pectoral fin and reduced bones.
Habitat vulnerability makes conservation crucial.
Findings are published in Zootaxa.