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
Nazzareno Formosa of Jesus and Mary which was attended by almost 800 people. He was buried on July 24, 1937 in St John Cemetery in Queens. Nazzareno Formosa Nazzareno Formosa (29 March 1901 - 22 July 1937) was an American-Maltese Roman Catholic priest who served as curate of the Parish Church of the Sacred Hearts of Jesus and Mary in Manhattan, New York City. Nazzareno Formosa was born in Gozo, Malta, on 29 March 1901 to Nikola Formosa and Maria Caruana, the first born of 8 children. He was ordained a priest on August 2, 1925. In 1927 he emigrated to the