Ablabesmyia (Ablabesmyia) huananensis, 2019

Niitsuma, Hiromi & Tang, Hongqu, 2019, Taxonomic review of Ablabesmyia Johannsen (Diptera: Chironomidae: Tanypodinae) from Oriental China, with descriptions of six new species, Zootaxa 4564 (1), pp. 248-270 : 261-263

Ablabesmyia (Ablabesmyia) huananensis sp. n.

(Figure 7)

Type material. Holotype male, CHINA: Hainan Province, Wanning City, Xinglong Town, Hekou bridge, 18°43.708'N, 110°11.767'E, 23 m alt., 26.iv.2012 . Paratypes: 1 male, Hainan Province, Ledong County, Jianfengling Nature Conservation Reserve , 18°46.071'N, 109°14.386'E, 150 m alt., 29.iv.2012 ; 2 males, Guangdong Province, Zhanjiang City, Huguangyan, Maar Lake , 21°09.137'N, 110°16.663'E, 123 m alt., 9.vii.2013 .

Etymology. From the Pinyin hua-nan, meaning southern China, where is the type locality.

Description. Male (n=4). Total length 1.9–2.2, 2.1 mm.

Coloration. Thorax yellow with scutal vittae, anepisternum II, preepisternum and postnotum dark brown. Abdomen pale yellow; T I–V each with anterior transverse brown band; T VI–VII and gonocoxite of hypopygium entirely dark brown; T VIII–IX slightly brown. Wing (Fig. 7A) with 2 dark spots at apices of R 1 and R 4+5. Legs white with dark bands; sub-basal and median bands in foretibia located 0.76–0.80, 0.78 and 0.39–0.42, 0.40, respectively, from apex.

Head. Temporals 19–21, 20. AR 1.2–1.3, 1.2. Clypeus with 22–27, 25 setae. Lengths of palpomeres 1–5 (µm): 28–33, 30 (3); 60–68, 63 (3); 75–85, 81 (3); 75–80, 78 (3); 158–183, 172 (3). Pm 4 /Pm 3 0.94–1.0, 0.97 (3); Pm 5 /Pm 4 2.1–2.3, 2.2 (3).

Thorax. Lateral antepronotals 1 (3); acrostichals 40–50, 46 (3); dorsocentrals 14–20, 17; humerals 8–13, 10; prealars 9–11, 11; supraalars 1; scutellars 40–52, 44.

Wing. Length 1.3–1.5, 1.4 mm. Squama with 20–25 (2) setae. Costal vein ending at M 3+4. VR 0.83–0.87, 0.85.

Legs. All tibiae each with single spur. Ti I spur 27–32, 29 µm long with 3–5, 4 (3) lateral teeth; Ti II spur 33–39, 36 µm long with 3–4, 3 (3) lateral teeth; Ti III spur 38–44, 42 µm long with 3–4, 3 (3) lateral teeth. Ti III comb incomplete, consisting of 3 bristles. Lengths and proportions of legs as in Table 6.

Hypopygium (Fig. 7B). T IX without lateral setae. Gonocoxite 104–114, 109 µm long with strong basolateral bulge. Aedeagal complex (Fig. 7C) with dorsal lobe 38–41, 40 µm long, 0.88–0.89, 0.89 times as long as blade, elongated, almost parallel-sided, bearing apicolateral projection; blade 42–46, 44 µm long, slender, sinuate,

A single tibial spur occurs in mid- and hind legs of Australasian A. (A.) hilli Freeman and Afrotropical A. (A.) rimae Harrison (see Roback 1982b for A. (A.) hilli, Harrison 1991 for A. (A.) rimae ). However, the male of A. (A.) huananensis sp. n. is separable from those of the two species by the aedeagal dorsal lobe, which is 0.88–0.89 times as long as the blade and has an apicolateral projection. In A. (A.) hilli and A. (A.) rimae , the dorsal lobe is smaller, at most half as long as the aedeagal blade, according to Roback (1982b) and Harrison (1991), respectively. In addition, the dorsal lobe is triangular in A. (A.) hilli and bears two pointed projections apically in A. (A.) rimae .

Within Ablabesmyia s. str., A. (A.) rimae and A. (A.) huananensis sp. n. are exceptions in having the wing with a costal vein ending above the tip of M 3+4 (see Harrison 1991, fig. 34 for the former), which resembles that of A. (Sartaia) metica Roback, 1983 (q.v.). In all other species of the subgenus, the costal vein ends closer to the tip of M 1+2 ( Roback 1971, Murray & Fittkau 1989).