Brachyneurina Mamaev, 1967

Jiao, Ke-Long, Mu, Yi-Ran & Bu, Wen-Jun, 2017, Notes on the Genus Mamaev (Diptera: Cecidomyiidae) with Description of Two New Species from China., Zoological Studies 56 (4), pp. 1-7 : 2-5

Genus Brachyneurina Mamaev, 1967

Brachyneurina Mamaev, 1967: 876 .

Type species, Brachyneurina xylophila Mamaev (original designation).

Generic Diagnosis: Adult. Male palpus with palpiger and 3 segments, last two segments longer than first one. Antenna with 10 flagellomeres ( Fig. 1A ), each with shorter neck and only one basal node; female neck distinctly shorter than male one. Wing ( Fig. 1B ) hyaline, sparsely covered with narrow scales and setose; vein R 1 joining vein C at basal 2/5; vein R 5 bent a little backward at distal 1/3, joining vein C slightly anterior to wing apex; vein Cu unforked. Tarsal claw ( Fig. 1C ) toothed on all legs. Male seventh and eighth tergites both reduced to one strongly sclerotized and linear band. Male genitalia: Gonocoxite with one or two swollen and densely pubescent mediobasal lobes; gonostylus slender and arched variously; cerci with a wider depression forming two lobes with various shapes; hypoproct simple, apically rounded or truncated, or slightly emarginated; aedeagus gradually tapered to apex, sometimes

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with constriction or other modifications. Female genitalia: Ovipositor short and not protrusible; cerci separated with two short lobes.

Remarks: The genus Brachyneurina is characterized by the unique combination of vein R 5 bent a little backward at distal 1/3, joining vein C slightly anterior to wing apex ( Fig. 1B ) and gonocoxite with one or two swollen, unsclerotized and densely pubescent mediobasal lobes ( Figs. 2A , 3A ) in the Brachyneurina group (including Brachyneurina Mamaev , Cingola Fedotova & Sidorenko , Undoneura Fedotova & Sidorenko , Novocalmonia Ozdikmen , Volsatiola Fedotova & Sidorenko ) ( Jiao and Bu 2014). And Brachyneurina and Volsatiola is also distinguishable from Cingola , Undoneura and Novocalmonia by the wing vein R 5 mentioned above, while the three genera above with vein R 5 bent a little forward in the middle, joining vein C distinctly anterior to wing apex, and it is different from Volsatiola by vein Cu unforked ( Fig. 1B ) and gonocoxite with unsclerotized and densely pubescent mediobasal lobe ( Figs. 2A , 3A ), while Volsatiola having vein Cu forked and gonocoxite with a sclerotized and snowmanshaped mediobasal lobe.

With the description of two new species in this paper, Brachyneurina is now consisted of five species all distributed in the Palaearctic region. Fedotova (2014) described Brachyneurina and

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gave a detailed generic diagnosis. In the present paper, the diagnosis is revised to give an adequate description and some parts of generic diagnosis for male are modified as follows to contain all known

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Brachyneurina species: gonocoxite with one or two swollen mediobasal lobes; hypoproct apically rounded or truncated, or slightly emarginated; aedeagus gradually tapered to apex, sometimes with constriction or other modifications.

Brachyneurina rhombica sp. nov. is characterized by the uniqueness of aedeagus distinctly constricted in the middle with four pairs of sclerotized prominences surrounding aedeagus and extending downwards on both sides ( Fig. 3A ), so is B. hemisphaerica sp. nov. by hypoproct apically truncated and cerci forming two sub-triangular lobes ( Fig. 2C ), while B. angulata is distinguishable from the other four congeners by gonocoxite with one sub-conical mediobasal lobe.

Brachyneurina hemisphaerica sp. nov. is similar to B. xylophila by gonocoxite with two mediobasal lobes, while B. rhombica sp. nov. by gonocoxite with only one mediobasal lobe ( Fig. 3A ). However, B. hemisphaerica differs from B. xylophila by the dorsal mediobasal lobe distinctly smaller than the ventral one ( Fig. 2A ), while B. xylophila with the dorsal one larger than ventral one.

Figures

Fig. 1. Brachyneurina hemisphaerica sp. nov. Male holotype (NKUCecid. No. BBI001) (A-C): (A), 3rd flagellomere (dorsal view). (B), Wing (dorsal view). (C), Fore acropod (lateral view).

Fig. 2. Brachyneurina hemisphaerica sp. nov. Male holotype (NKUCecid. No. BBI001) (A-C): (A), Genitalia (dorsal view, cerci and hypoproct removed). (B), Genitalia (dorsal view). (C), cerci and hypoproct (dorsal view).

Fig. 3. Brachyneurina rhombica sp. nov. Male holotype (NKUCecid. No. BBL001) (A-C): (A), Genitalia (dorsal view, cerci and hypoproct removed). (B), Genitalia (dorsal view). (C), cerci and hypoproct (dorsal view).