Three new Melanorivulus killifish species from Brazil

by | Jan 17, 2018 | Advanced Aquarist | 0 comments

These killifishes from the Paraná River Basin were once thought of as variants of single polymorphic species, Melanorivulus pictus, but further field studies have concluded that these fishes are actually many distinct species, currently M. vittatus; M. scalaris; M. linearis; M. faucireticulatus; M. egens; M. nigropunctatus; M. proximus; M. rutilicaudus; M. ofaie; M. nigromarginatus; M. formosensis.  More new species will likely be discovered within the M. pictus group as research advances.

The three new species below are described in ZooKeys.


Melanorivulus linearis has sharply delineated thin, red chevron lines.


Melanorivulus nigromarginatus is easily identified by its black anal and lower caudal fin margins (hence its name).

Three new Melanorivulus killifish species from Brazil

Melanorivulus proximus shares much physical similaries with its cohabitating congenor, M. scalaris.

  • Leonard Ho

    I'm a passionate aquarist of over 30 years, a coral reef lover, and the blog editor for Advanced Aquarist. While aquarium gadgets interest me, it's really livestock (especially fish), artistry of aquariums, and "method behind the madness" processes that captivate my attention.

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