In the literature Cyclops vicinus is described as a winter form. This fits, because the following one I
have found yesterday in my garden pond.

Characteristcs of Cyclops vicicnus are the feathered, equal sized end-bristles and the hairy inner
border of the furca. Above the furca is a keel-shaped chitin part.

Here is a closer look at the furca with its hairy inner border.:
