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That's right, Tony, and while getting to the end one may learn a lot:
I was in doubt whether the flat ones could be aphids like Periphyllus as I only knew the aestivating 1st instars of P. aceriola. But now I've seen, that P. testudinaceus produces these flat nymphs < 1 mm.
Thanks empeejay!

Greetings, Eric