You should use the key from Ulrich Einsle - it is in german but at a very high level and well to handle, the title is "Süßwasserfauna von Mitteleuropa, 21 Bde., Bd.8/4-1, Crustacea, Copepoda, Calanoida und Cyclopoida". This accounts only for copepods in inland waters but I guess this is your issue here
Hi, you could contact Ricardo Palomares García ([email protected]) that have a book published on copepod taxonomy. This book are in spanish but is very broad and complete.
Palomares–García JR, Suárez–Morales E, Hernández–Trujillo S
(1998) Catálogo de los copépodos (Crustácea) pelágicos del