At some point prior to 1891, it entered the collection of palaeontologist Carlos Ameghino and in that year it was described by his brother, Florentino. At some point, MACN-A 634 was lost. It was, in 2008, replaced with a neotype, MACN-A 575. A second Homunculus, H. vizcainoi, also from the Santa Cruz Formation, was described in 2019.

Synonyms

In the same year as Florentino Ameghino's paper, Swiss geologist and palaeontologist Alcides Mercerat

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