Brachyneurina hemisphaerica Jiao et Bu, sp., 2017

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 : 5-6

Brachyneurina hemisphaerica Jiao et Bu, sp.

nov.

( Figs. 1-2 )

urn:lsid:zoobank.org:act:3ABCAB35-A3BF-4735-8A84-3A49A8355146

Type material: Holotype. ò, China, Heilongjiang: Shangzhi, Mao’er Mountain, Lüjiaweizi (45.14°N, 127.57°E), 22-24.VII.2003, Jun Li leg., altitude 300 m, Malaise trap, NKUCecid. No. BBI001 . Paratypes: 3òò, same data as holotype, NKUCecid. No. BBI002-004; 1ò, China, Heilongjiang, Shangzhi, Mao’er Mountain, Lüjiaweizi (45.16°N, 127.30°E), 25.VII.2003, Jun Li leg., altitude 200 m, catching net, NKUCecid. No. BBI005. All type specimens deposited in NKUM.

Etymology: The specific name hemisphaerica means the male gonocoxite with two hemispheric mediobasal lobes.

Diagnosis: Gonocoxite with two hemispheric and densely pubescent mediobasal lobes including a smaller dorsal one and a distinctly larger ventral one; cerci separated with a U-shaped depression forming two sub-triangular lobes; hypoproct apically truncated; aedeagus with the apex distinctly broadened.

Description: Body colour yellow brown. Body length: 1.00- 1.10 mm (n = 5). Wing length (measured from the base): 0.90-1.00 mm (n = 5). Wing width: 0.40-0.50 mm (n = 5).

Head ( Fig. 1A ): Eye bridge 5 facets long in the middle of vertex. Palpus sparsely setose, with palpiger and 3 segments, last two segments longer than first one. Antenna with 10 flagellomeres; pedicel subglobular, smaller than scape, both densely covered with setae ventrally; node of all flagellomeres subcylindrical, a little broadened subbasally, neck of all flagellomeres shorter; each node with 2 horizontal, appressed, band-shaped circumfila, subapically and subbasally respectively linked by two similar longitudinal circumfila, and 2 whorls of long, strong and irregular setae, one subbasal and one subapical; first and second flagellomeres fused; 3rd male flagellomere as in figure 1A, with the node 1.80-1.90 times as long as wide and the neck 2.5-2.6 times as long as wide, 0.54-0.55 times length of node.

Thorax ( Figs. 1B, 1C ): Wing ( Fig. 1B ) hyaline, 2.21-2.22 times as long as wide. Vein Sc weak, C, R 1 and R 5 strong; vein R 1 joining vein C at basal 2/5, with two pores respectively at basal 1/4 and distal 1/4; vein R 5 bent a little backward at distal 1/3, joining vein C slightly anterior to wing apex, with one pore at basal 1/3; vein M missing; vein Cu unforked and bent backward, vein PCu parallel with Cu. Legs densely covered with narrow scales and sparse setae. Tarsal claw ( Fig. 1C ) toothed on all legs; empodium a little shorter than tarsal claw.

Abdomen: Each tergite and sternite densely covered uniformly with scales. First through sixth tergites developed and strip-shaped, with an irregular but mostly single, posterior row of setae, with several pairs of lateral setae, and with one anterior of trichoid sensilla; first tergite much shorter than second tergite; seventh and eighth tergites both reduced to one strongly sclerotized, latitudinal and linear band with several scattered setae; second through eighth sternites covered with many scattered lateral and central setae, with one anterior pair of closely set trichoid sensilla; second stemite divided latitudinally into two bands, respectively with one single, anterior row of setae and one single, posterior row of setae; third through eighth sternites sub-rectangular with an irregular but mostly single, posterior row of setae; seventh sternite shorter than sixth; eighth sternite much shorter and much narrower than seventh.

Male genitalia ( Figs. 2A, 2B, 2C ): Gonocoxite slender, with two hemispheric and densely pubescent mediobasal lobes including a smaller dorsal one and a distinctly larger ventral one; gonostylus slender and strongly arched inwardly at basal 1/3, gradually tapering from subbase to the middle, approximately 3/4 length of gonocoxite, covered with a few setae and dense microtrichiae, with one short setae located apically on the inner side, toothed apically; cerci separated with a U-shaped depression forming two sub-triangular lobes with a few long lateral setae; hypoproct sub-rectangular, not sclerotized, a little shorter than cerci, apically truncated with a few short setae; aedeagus gradually tapered to apex, distinctly shorter than gonocoxite, with the apex distinctly broadened, at distal 1/3 with a pair of sensory setae dorsally, without constriction or any other modifications. Female genitalia unknown.

Distribution: China (Heilongjiang).

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).