Revision of the Japanese Ablabesmyia (Diptera: Chironomidae: Tanypodinae), with descriptions of three new species
Author
Niitsuma, Hiromi
text
Zootaxa
2013
3664
4
479
504
journal article
10.11646/zootaxa.3664.4.4
39399033-6847-442b-9d34-d01014510f00
1175-5326
223656
46384FDA-C328-4A6C-A45F-F60C09410D25
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
.
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) |
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.