[1] The specific name stelzneri honors Alfred Wilhelm Stelzner, a German geologist who spent some time in Argentina.

[2] Melanophryniscus stelzneri grows to about 3.8 cm (1.5 in), with females typically being larger than males.

[2] They are currently known from the Córdoba, San Luis, and Salta Provinces of Argentina.

Reproduction takes place in shallow ponds, streams, bogs, and even roadside ditches.

It is believed that the toxins are created from alkaloids found in their natural diet.