This sheet is not considered at the species level and is used for records that do not allow for the differentiation of species from specimens belonging to the genus. On the other hand, there is a specific sheet for specimens that, while they cannot be diagnosed at the species level, are limited to the Common Piojito (Serpophaga subcristata) or the Trilling Piojito (Serpophaga griseicepilla), that sheet is called Serpophaga subcristata-griseicapilla.