Calopteryx ludoviciana – synoniem of Calopteryx splendens
Coenagrion castellani – synoniem of Coenagrion mercuriale
Cordulia linaenea – synoniem of Cordulia aenea
Cordulia subalpina – synoniem of Somatochlora arctica
Crocothemis servilia – synoniem of Crocothemis erythraea