 According to some authors, actual usage of the term "patera" had deviated from its definition, and it became not only nomenclatural, but to some extent geological, being used to indicate volcanic origin of the feature.After Venusian Cleopatra Patera turned out to be an impact crater (instead of a volcanic one, as previously suggested), it was renamed into crater Cleopatra.Usually volcanic crater gets a proper name if the volcano itself is low and inconspicuous.