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described an incomplete mandibular fragment, bearing part of a molar. He dubbed the specimen Ecphantodon ceboides. However, E. ceboides was treated by Ameghino as indistinguishable from Homunculus, and he opted to synonymise the two. The type specimen of E. ceboides has been lost. In the paper describing H. patagonicus, Florentino Ameghino also named Anthropops perfectus, which he distinguished based on purported characteristics of the mandible and lower canine,

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