#6
Thanks Cthirion and Grigory. From another source I have received the response that it is most probably a pseudococcid nymf, so that corresponds with the opinion of Grigory.
Pseudoccocid nymfs cannot be identified to species level since no keys for nymfs are available. I will have to go back in April/May next year to try to find adults.
I will change the title to coccoid nymf.