Akodon spegazzinii is found in northwestern Argentina, in the provinces of Salta, Catamarca, Tucumán, La Rioja, and Mendoza, at altitudes of . Although its main distribution is in the northern provinces of Salta, Tucumán, and Catamarca, there are also scattered records from the more southern provinces of La Rioja and Mendoza, where it is likely restricted to patches of wet habitat. "Akodon alterus" has been reported from Jujuy, but this record was likely based on misidentified specimens of "A. boliviensis", and records of "Akodon spegazzinii" from Jujuy were based on misidentified "A. sylvanus". "Akodon spegazzinii" is known from a paleontological site in
Myrmecia formosa yellow. This species compared to others is rather unusual with its colours. Myrmecia formosa Myrmecia formosa is an Australian ant which belongs to the "Myrmecia" genus. This species is native to Australia. Their distribution in Australia has notably been studied and collected in New South Wales. "Myrmecia formosa" is a small species, as the typical size for a worker in the species is only 10-13 millimetres in length. The clypeus, pronotum, mesonotum, and the node is a blood red colour, the gaster, sides of the thorax, half of the head and other features are black, legs are brown, tarsi is