Topic: Birch gall synonymy
Hello Chris. These two flies should be synonyms, I think:
Plemeliella betulicola (Kieffer, 1889), NBNSYS0000028007
and
Resseliella betulicola (Kieffer, 1889), NHMSYS0020470509
EOL does not have the former, though it is used by the 2002 Redfern & Shirley, and there is a post by Keith Harris in the galls forum thus:
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These folded leaves on Betula and the larva shown in your images indicate that this is Plemeliella betulicola (Kieffer 1889). For some reason that species is placed in Resseliella in the World Cecidomyiidae Catalog (Gagne & Jaschhof, 2014).
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M.