Pekinomyia Jiao & Kolesik, 2020

Jiao, Ke-Long, Zhou, Xiao-Yi, Wang, Hao, Fu, Huai-Jun, Zhou, Da-Kang, Li, Jing-Bo, Xiong, De-Ping, Wang, Yuan-Hong, Bu, Wen-Jun & Kolesik, Peter, 2020, A new genus and species of gall midge (Diptera: Cecidomyiidae) inducing leaf galls on Peking lilac, Syringa reticulata subsp. pekinensis (Oleaceae), in China, Zootaxa 4742 (1), pp. 194-200 : 195

Pekinomyia Jiao & Kolesik , gen. nov.

http://zoobank.org/ urn:lsid:zoobank.org:act:7390F13D-EE04-41FF-B001-53955DA96977 (to be added once manuscript is accepted)

Type species: Pekinomyia syringae Jiao & Kolesik , sp. nov.

Diagnosis. The genus belongs to the supertribe Lasiopteridi because it has an irregular number of flagellomeres within species, the male and female flagellomeres are barrel-shaped, with male flagellomeres differing from those of the female by longer apical necks, the postvertical peak on the head is absent and the female cerci are fused into a single terminal lamella. Were it not for the missing gonocoxal mesobasal lobes in male terminalia, the genus could be accommodated within the tribe Oligotrophini (sensu Gagné 2016) or Dasineurini (sensu Dorchin et al. 2019). The lack of the mesobasal lobes is a character state unusual among genera of Lasiopteridi which ordinarily have a weakly sclerotized aedeagus supported by variously shaped mesobasal lobes. The aedeagus of the new genus is strongly sclerotized, a character that must have developed parallel with the loss of the mesobasal lobes. The COI and 12S gene sequences place the new genus among Lasiopteridi, with no proximity to any currently sequenced genera. Therefore, we consider Pekinomyia a Lasiopteridi genus currently not assigned to a tribe.

Description. Head. Eye hemispheres joined by an eye bridge consisting of several ommatidia. Flagellomeres irregular in number, made up of a barrel-shaped node and a neck that is long in male and short in female; first and second flagellomeres fused. Maxillary palpus 4-segmented. Thorax. Wing vein R 5 slightly shorter than wing length, C not interrupted at juncture with R 5, R S rudimentary. Tarsal claws simple, empodia longer than claws. Abdomen. Male terminalia with completely setulose gonostylus; aedeagus strongly sclerotized, with few vertical grooves ventrally; non papillose; no gonocoxal mesobasal lobes. Female eighth tergite undivided. Ovipositor short, robust, retractable; fused cerci large, rounded; distal part of 9th abdominal segment in form of a large, setose lobe. Pupa. Antennal horns small, cephalic papillae with long setae, abdominal segments with no dorsal spines. Larva. The basic pattern of papillae as for Lasiopteridi ( Möhn 1955) except reduced lateral and terminal papillae. Sternal spatula bilobed.

Etymology. The name combines Pekinum, the Latin name for Beijing, where the type species of the new genus was discovered, and the suffix -myia, Greek for fly.