In the 17th century, the Tremembé began to settle in the Jesuit mission of Aracati-mirím, at Aldeia do Cajueiro (now Almofala) by the Acaraú River in Ceará.
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Six species are known from northeastern Brazilian coastal river basins: A. rochai from rivers around Fortaleza, A. raimundi from the Parnaíba River, A. carvalhoi from rivers around Guaramiranga, Ceará State, A. maculosus from the Itapicuru River, A. menezesi from the Jaguaribe River, and A. spilotus from the Acaráu River.