Ablabesmyia (Karelia) lata, Niitsuma, Hiromi, 2013

Niitsuma, Hiromi, 2013, Revision of the Japanese Ablabesmyia (Diptera: Chironomidae: Tanypodinae), with descriptions of three new species, Zootaxa 3664 (4), pp. 479-504 : 500-501

Ablabesmyia (Karelia) lata sp. n.

( Figs 64–66 )

Type material. Holotype male (SUM-IC-T0482), JAPAN: Gifu, Mino, Nagara River, 12.ix.2009 (adult emerged 18.ix.2009). Paratypes. 1 male (SUM-IC-T0477), same locality as holotype, 4.v.2008 (adult emerged 11.v.2008); same data as holotype except 6 males (SUM-IC-T0483, T0485–T0489, adults emerged 20–26.ix.2009).

Etymology. From Latin latus, broad, referring to the prominent lateral lobe in the aedeagal complex.

Description. Male (n = 8). Body length 2.4–3.0, 2.7 mm.

Colouration. Thorax yellow with dark brown scutal vittae, anepisternum II, preepisternum, scutellum and postnotum. Abdomen pale yellow with dark markings; tergites III–V with 3 dark brown spots anteromedially and anterolaterally, but anteromedial spots occasionally absent; tergites VI–VIII mostly dark brown; hypopygium pale yellow. Wing ( Fig. 64 ) darkened on humeral cross-vein, RM, FCu, apex of R4+5, and areas along C between apices of R1 and R3, and above RM; distal marking in anal cell separating into 2 spots. Subbasal and median bands on foretibia located 0.75–0.79 and 0.38–0.41, respectively, from apex of tibia.

Head. Temporals 19–24, 22, multiserial except uniserial postorbitals. AR 1.1–1.4. Clypeus rounded with 22– 32, 27 setae. Lengths of palpomeres 1–5 (μm): 40–50, 43 (6); 60–75, 68 (5); 125–153, 139 (7); 138–170, 156 (7); 220–265, 246 (7). Pm4 1.1–1.2 times as long as Pm3; Pm5 1.5–1.7 times as long as Pm4.

Thorax. Aps 7–10, 8; Ac 41–53, 44 (5), biserial between median scutal vittae, diverging posteriorly; Dc 16–21, 18, uniserial, becoming biserial anteriorly; H 6–12, 9; Pa 14–23, 18; Su 1; Scts 27–39, 32.

Wing. Length 1.5–1.9, 1.7 mm. Squama with 27–37, 30 setae. VR 0.81–0.87.

Legs. Spur on foretibia 35–43, 38 μm long, with 9 (3) lateral teeth. Spurs on mid tibia 45–53, 48 and 25–35, 30 μm long, with 7–8, 7 (3) and 5 (6) lateral teeth, respectively; inner spur 1.5–1.8 times as long as outer spur. Spurs on hind tibia 50–60, 54 and 28–35, 32 μm long, with 4–6, 5 (5) and 3–4, 3 (3) lateral teeth, respectively; inner spur 1.5–1.8 times as long as outer spur; hind tibial comb consisting of 4–5, 4 bristles. All legs with subapical pseudospurs on ta1–2 or ta1–3; claws pointed apically, each with 2 long and 3–4 short basoventral spines. Lengths and proportions of leg segments as in Table 6 .

Hypopygium ( Fig. 65 ). Tergite IX with 2–4, 3 lateral setae. Gonocoxite 95–118, 107 μm long; dorsal lobe 15– 20, 18 (7) μm long, with setal fringe along almost full length; blade 33–40, 37 (7) μm long, curved and apically sharp-pointed; lateral lobe 40–50, 46 (7) μm long, broad, with apex pointed; lateral filaments not evident ( Fig. 66 ). Gonostylus 125–140, 134 μm long, 1.2–1.3 times as long as gonocoxite, with apically acute megaseta. Female, pupa and larva. Unknown.

Remarks. The male of A. (K.) lata most resembles that of A. (K.) makarchenkoi in the aedeagal complex with a broad lateral lobe, but differs from the latter in the dorsal lobe with a setal fringe along its almost full length. A. (K.) makarchenkoi has a dorsal lobe with a setal brush at the apex.

Figures

FIGURES 64 – 66. Ablabesmyia (Karelia) lata sp. n., male. 64, Wing; 65, hypopygium, dorsal view; 66, aedeagal complex, compressed.

Tables

TABLE 6. Lengths (μm) and proportions of legs of Ablabesmyia (Karelia) lata sp. n., male (n = 8).

fe	ti	ta1	ta2	ta3	ta4	ta5	LR	BR
P1 545–677	586–737	434–535	263–333	202–253	152–172	91–111	0.69–0.78	4.0–4.6
624	687	498 (7)	303 (7)	229 (7)	166 (7)	105 (7)
P2 606–758	556–697	485–586	242–293	182–222	131–152	81–101	0.82–0.89	5.7–7.2
699	645	550 (6)	274 (6)	212 (6)	143 (6)	94 (6)
P3 545–677	667–869	657–737	333–384	253–293	172–182	101–111	0.84–0.88	5.6–6.3
625	792	694 (4)	359 (4)	270 (4)	177 (4)	106 (4)