Revision of the birch-associated genus Massalongia (Diptera, Cecidomyiidae), with description of a new species from Japan and a taxonomic key to worldwide species Author Elsayed, Ayman Khamis The Botanical Gardens, Graduate School of Science, The University of Tokyo, Tokyo 112 - 0001, Japan & Department of Applied Entomology, Faculty of Agriculture, Alexandria University, Alexandria, Egypt https://orcid.org/0000-0003-0110-543X ayman.khamis77@gmail.com Author Skuhrava, Marcela Bitovska 1227, Praha 4, Czech Republic Author Ohta, Kazuki Laboratory of Systems Ecology, Faculty of Agriculture, Saga University, Saga 840 - 8502, Japan & The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890 - 0065, Japan Author Yoshida, Satoshi Laboratory of Systems Ecology, Faculty of Agriculture, Saga University, Saga 840 - 8502, Japan Author Tokuda, Makoto Laboratory of Systems Ecology, Faculty of Agriculture, Saga University, Saga 840 - 8502, Japan & The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890 - 0065, Japan text ZooKeys 2020 958 1 27 http://dx.doi.org/10.3897/zookeys.958.54300 journal article http://dx.doi.org/10.3897/zookeys.958.54300 1313-2970-958-1 F1D6AF59839A419782766AAB6B3669D8 16CB5344BCCB5E41A5418561334B56A9 Massalongia papyriferae ( Gagne , 1967) comb. nov. Oligotrophus papyriferae Gagne , 1967: 132. Apagodiplosis papyriferae Gagne , 1973: 862. Description. (Based on Gagne 1967 , 1973 ). Head . Frons with 2-5 setae. Male flagellomere XII tapered distally. Thorax . Anepimeron with 7-17 setae. Female abdomen . Tergites I-VI bare posteromedially; tergite VII with entire posterior row of setae. Ovipositor: protrusible portion with pencil-shaped dorsal sclerite on posterior 2 thirds. Male abdomen . Terminalia: gonostyli with blunt denticles; cerci rounded; hypoproct bilobed; aedeagus shorter than cerci and hypoproct. Pupa . Antennal horns short; 2 setose lower facial papillae present; cephalic setae short. Abdominal terga covered with uniformly tiny spinules. Larva . Spatula short, bilobed, with anterior lobes slightly curved toward each other. Terminal segment with 4 corniform papillae and 4 setose terminal papillae. Distribution. North America: Canada (Quebec) and USA (Washington, Oregon and Michigan) ( Gagne and Jaschhof 2017 ). Gall and life history. Massalongia papyriferae forms bud galls on the paper birch, B. papyrifera . The mature larva drops to the leaf litter to overwinter in a bottle-shaped cocoon. Adults emerge in spring ( Gagne 1967 ). Remarks. See under M. nakamuratetsui .