Ablabesmyia (Ablabesmyia) lyrata, 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 : 257

Ablabesmyia (Ablabesmyia) lyrata sp. n.

( Figure 5 )

Type material. Holotype male, CHINA: Hainan Province, Bawangling National Nature Conservation Reserve , 19°06.752'N, 109°11.980'E, 593 m alt., 30.iv.2012 . Paratypes: 1 male, Fujian Province, Meihuashan National Nature Conservation Reserve , 25°19.838'N, 116°56.483'E, 455 m alt., 16.xi.2012 ; 1 male, Guangdong Province, Guangzhou City, Zengcheng District, Lan Stream , 23°21.318′N 113°58.070′E, 20.ii.2017 ; 1 male, as previous except 10.xii.2017; 1 pupa (pharate male), as previous except 18.i.2018; 1 male, Hainan Province, Quiongzhong Li and Miao Autonomous County, Limushant National Nature Conservation Reserve , brook in Mt. Limu , 15.iv.2016 ; 2 males with 1 pupal exuviae, 1 pupa (pharate male), Hainan Province, Changjiang Li Autonomous County, Bawangling National Nature Conservation Reserve, brook near Bawangling Field Station , 17.vi.2016 .

Etymology. From the Latin lyratus, referring to the lyrate shape of the aedeagal lateral lobe in the male adult.

Description. Male (n=7). Total length 2.6–3.0, 2.9 mm.

Coloration. Thorax light brown, with darker scutal vittae, anepisternum II, preepisternum and postnotum. Abdomen pale yellow with T VI–VIII slightly darkened posteriorly. Wing ( Fig. 5A ) with 3 dark spots at apices of R 1, R 3 and R 4+5. Legs white with dark bands; foretibia with sub-basal and median bands located 0.78–0.80, 0.79 and 0.37–0.41, 0.39, respectively, from apex.

Head. Temporals 22–39, 31. AR 1.2–1.6, 1.4 (6). Clypeus with 40–48, 43 setae. Lengths of palpomeres 1–5 (µm): 44–49, 47; 103–118, 110; 111–126, 118; 98–106, 101; 200–253, 221. Pm 4 /Pm 3 0.80–0.89, 0.85; Pm 5 /Pm 4 2.0– 2.4, 2.2.

Thorax. Antepronotum with 5–14, 9 lateral setae. Acrostichals 44–67, 53 (6); dorsocentrals 20–29, 24; humerals 8–15, 11; prealars 15–27, 21; supraalars 1. Scutellum with 30–42, 35 setae.

Wing. Length 1.7–2.2, 2.0 (6) mm. Squama with 33–41, 37 (5) setae. VR 0.82–0.86, 0.85.

Legs. Ti I spur 42–49, 46 (6) µm long with 6–8, 7 (6) lateral teeth. Ti II spurs 51–62, 57 (6) and 21–31, 26 (6) µm long with 5–9, 6 (6) and 4–5, 5 (6) lateral teeth, respectively; inner spur/outer spur 1.8–2.5, 2.3 (6). Ti III spurs 54–60, 58 (6) and 23–28, 25 (6) µm long with 4–5, 5 (6) and 2–3, 3 (5) lateral teeth, respectively; inner spur/outer spur 2.2–2.6, 2.3 (6). Ti III comb consisting of 5–7, 6 bristles. Lengths and proportions of legs as in Table 4.

Hypopygium ( Fig. 5B ). T IX with 1–3, 1 seta on each side. Gonocoxite 150–160, 153 µm long, conspicuously swollen basolaterally. Aedeagal complex ( Figs 5C, D ) with dorsal lobe 26–35, 31 µm long, usually bent midway, bearing apical brush; blade 42–53, 48 µm long, curved dorsally, tapering toward pointed apex; lateral lobe 25–37, 31 µm long, broad and lyrate in normal position; lateral filaments present. Gonostylus 140–153, 146 µm long, 0.93– 1.0, 0.96 times as long as gonocoxite.

Pupa (n=3). Body length 3.7–4.0, 3.9 mm.

Coloration. Exuviae pale brown, with distinct color pattern. Wing sheath pale brown, without any marking except infuscated margin. A.T II–VI ( Fig. 5E ) slightly darkened laterally, anteromedially with crescent-shaped or rounded dark macula.

Cephalothorax. Thoracic horn bulbous, 303–313, 307 µm long, 2.6 (1) times as long as broadest width, with membranous apical nipple covering aeropyle tube club-shaped apically. Thoracic comb with 9–11, 10 apically round teeth.

Abdomen ( Fig. 5F ). Tergal shagreen ( Fig. 5G ) consisting of slightly arched transverse rows of blunt or pointed scales. Posterolateral projections present on A VIII. LS 1 -seta on A VII located 0.45–0.50, 0.47 from anterior margin, and on A VIII located 0.22–0.26, 0.24. Anal lobe 343–354, 350 µm long, 2.8–2.9, 2.8 times as long as wide, with anterior and posterior macrosetae located 0.50–0.54, 0.52 and 0.62–0.66, 0.64, respectively, from anterior margin; sparse spinules present along its outer margin. Male genital sac 0.78–0.80, 0.79 as long as anal lobe.

Female and larva. Unknown.

Remarks. The male is similar to that of A. (A.) amamisimplex Sasa in the digitate lateral lobe and the aedeagal blade tapering toward pointed apex, but differs in the lateral lobe with a comb-like apex, the gonocoxite with a stronger basolateral bulge, and the wing with three dark spots along the costal margin; whereas, in A. (A.) amamisimplex , the lateral lobe has a palmate apex, the gonocoxite possesses a weak basolateral bulge, and the wing has two spots along the costal margin ( Niitsuma 2013). The pupa is also distinct from that of A. (A.) amamisimplex in the posterolateral projection of the abdominal segment VIII, which is unique among the known Ablabesmyia pupae.

Figures

FIGURE 5. Ablabesmyia (Ablabesmyia) lyrata sp. n., male (A–D) and pupa (E–G). A, Wing; B, hypopygium, dorsal view; C– D, aedeagal complex, normal position (C) and everted position (D); E, abdominal segment IV, dorsal view, showing pigmentation pattern; F, abdomen, dorsal view; G, shagreen on posteromedial part of abdominal tergite IV.