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A new tetra with color-coded sexing

By Leonard Ho - Posted Sep 20, 2017 09:00 AM
Many tetras are difficult to sex. Often, differentiation comes down to fin lengths, subtle color deviations, or sometimes just the "fullness" of their bellies. But with Hyphessobrycon myrmex, the color between the sexes is unmistakable, and that's a good thing because this species is tiny.
A new tetra with color-coded sexing

Hyphessobrycon myrmex

As you can see in the photo above, the new tetra "exhibits a conspicuous sexual dichromatism, with adult males red to orange and females and immatures pale yellow."

Hyphessobrycon myrmex is a very tiny tetra that measures only about 2cm (0.75 inches) in length.  It's latin name, myrmex, is Greek for "ant."  The new species is found in Mato Grosso, Brazil and described in the Journal of Fish Biology.

Author: Leonard Ho
Location: Southern California

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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