The “African” genus Argiagrion is a Brazilian Leptagrion species and the “Philippine” Moroagrion a European Pyrrhosoma (Odonata: Coenagrionidae)

Argiagrion leoninum, known only from the female holotype alleged to be West African, is shown to be a junior synonym of the Brazilian species Leptagrion macrurum. Moroagrion danielli, known only from the male holotype thought to be from the Philippines, is a junior synonym of the European Pyrrhosoma nymphula. Argiagrion and Moroagrion were both monotypic genera and become junior synonyms of Leptagrion and Pyrrhosoma respectively.