Periphyllus aceris (Linnaeus, 1761)
maple periphyllus-aphid
on Acer

Acer platanoides, England, East Essex © Bob Dransfield & Bob Brightwell, Influential Points (more pictures there!)
aestivating larva (from Hille Ris Lambers, 1947b)
gall
no host plant alternation, not attended by ants. The aphids live at the underside of the leaves, on petioles and on very young shoots; they cause suction damage (disfiguring, growth disturbance) of the inflorescence and young foliage.
During high summer the larvae pass through an aestivation period. They then are long-hairy, and sit immobile in large groups, the head directed towards the centre of the group.
host plants
Sapindaceae, monophagous
Acer platanoides.
There also are reports of Acer obtusatum, opalus and saccharinum. In Spain and Serbia on A. campestre.
synonyms
Chaetophorella aceris.
references
Barbagallo, Binazzi, Pennacchio & Pollini (2011a), Barbagallo & Massimino Cocuzza (2014a), Blackman & Eastop (2016), Börner & Franz (1956a), Buhr (1964b), Görür, Işik, Akyürek & Zeybekoğlu (2009a), Heie (1982a), Hellrigl (2004a), Hille Ris Lambers (1947b), Influential Points (2016), Junkiert, Wieczorek & Wojciechowski (2011a), Kollár (2007a), Lampel & Meier (2003a), Lubiarz & Mackoś-Iwaszko (2015a), Mackoś (0000a), Mackoś-Iwaszko, Lubiarz & Karczmarz (2015a), Nieto Nafría & Mier Durante (1998a), Osiadacz & Wojciechowski (2008a), Pérez Hidalgo, Martínez Peláez & Nieto Nafría (2001a), Petrović (1998a), Rakauskas & Trukšinaitė (2011a), Ripka, Reider & Szalay-Marzsó (1998a), Roskam (2019a), Wieczorek & Junkiert (2012a), Wojciechowski, Depa, Halgoš ao (2016a).