[1][4] This freshwater fish is found in clear coastal rivers and streams in eastern Brazil, ranging from southern Bahia to northern Rio Grande do Sul.

Except for this sheen, their two stripes, and their internal organs, it is mostly transparent similar to the so-called "X-ray tetra", Pristella maxillaris.

According to a 2008 report, "phylogeographic studies based on molecular data indicate significant differences between the isolated populations of M.

They also have a modified caudal gland used to release pheromones, a characteristic they share with all members of the Glandulocaudinae subfamily.

[8] This noise also plays a role in courtship, as the male chases and hovers near the female while taking gulps of air and expelling it to make a rhythmic sound.