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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The tiny fish is Priocharax rex, a species described in 2025 from Colombia’s río Putumayo drainage. Its unexpected feature is a round flap of skin between its pelvic fins. Scientists have documented the flap, but its function has not been established; calling it an “organ” goes beyond what the available description demonstrates.
What is the unusual feature?
The authors of the species description distinguish Priocharax rex from its close relatives by “a unique round flap of skin between contralateral pelvic fins.” The pelvic fins are the paired fins on the underside of a fish; the flap lies between them. The paper identifies its shape and position, but does not report what it does. The description in Zootaxa therefore supports “skin flap” or “anatomical feature” as precise terms. “Mysterious organ” is a headline framing, not a demonstrated functional classification.
Where was Priocharax rex found?
The species was described from the río Putumayo drainage in Amazonas Department, Colombia. The taxonomic treatment records its type locality as a tributary forest stream. The treatment record identifies the holotype—the specimen designated as the name-bearing reference for the species—as CIACOL 7395, measuring 19.8 mm in standard length. Standard length is a specimen measurement; it should not be read as an average adult size for the species.
What is known about its relatives?
Priocharax is a genus of small fishes. When P. rex was described, the authors counted nine other valid species in the genus. They also characterize the genus as paedomorphic: adults retain some traits associated with earlier developmental stages. The paper points to reductions in the laterosensory system, fin-ray counts, and ossification in parts of the skull as genus-level examples. Those observations do not explain the skin flap in P. rex, and the description does not connect the flap to paedomorphosis. PubMed’s record of the 2025 paper independently lists the publication and abstract.
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What does the flap do?
Its function is unknown in the cited species description and taxonomic treatment. The available evidence documents an anatomical difference, not an experiment or observation establishing how the flap is used. A sensory, reproductive, swimming-related, or other role would be speculation unless further research tests and supports it. The feature is notable precisely because the authors could distinguish it from those of the other described members of the genus, while its purpose remains unresolved.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the discovery does—and does not—tell us
- Observed: a round flap of skin between the opposing pelvic fins, reported as unique among the compared Priocharax species.
- Recorded: a forest-stream tributary in Colombia’s río Putumayo drainage as the type locality, and a 19.8 mm standard-length holotype.
- Not established: the flap’s function, how common the species is, or a population-wide size estimate.
The species description appeared on 28 January 2025 in Zootaxa 5575(4), pages 545–554. The journal record lists George Mendes Taliaferro Mattox, Astrid Acosta-Santos, Juan D. Bogotá-Gregory, Edwin Agudelo, and Flávio C. T. Lima as authors.
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