One of these symbols, the Paço de São Cristóvão, the official residence of the emperors in the Quinta da Boa Vista, became vacant; therefore, in 1892, the National Museum, with all its collections, valuables and researchers, was transferred to this palace, where it stays until today.
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The first to come was Ludwig Riedel (1761–1861), a German botanist who had participated in Baron von Langsdorff's famed expedition to Mato Grosso from 1826 to 1828.
Oxalaia is known from the holotype MN 6117-V, fused premaxillae of a very large individual and from the referred fragment MN 6119-V, an isolated and incomplete left maxilla, which were found on Cajual Island, Maranhão of northeastern Brazil.
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