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In page Langstonia:

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Finally, a premaxilla and maxilla fragment found in Itaboraí Basin in Brazil dating from the Middle Paleocene (and where have been found fossils of other sebecids) has been classified as related to this species, under the name of Sebecus cf. huilensis, whose main features are very similar to Langstonia, suggesting that the latter is part of a lineage of sebecids with an extensive temporal and geographical record.(Pinheiro, Campos & Bergqvist 2011, p. R92)