Review of genus Pseudorthocladius Goetghebuer, 1943 (Diptera, Chironomidae) from China
Author
Ren, Jing
Author
Lin, Xiaolong
Author
Wang, Xinhua
text
ZooKeys
2014
387
51
72
http://dx.doi.org/10.3897/zookeys.387.5808
journal article
http://dx.doi.org/10.3897/zookeys.387.5808
1313-2970-387-51
D52BB193A72747DB82A1019D652A3D35
D52BB193A72747DB82A1019D652A3D35
Pseudorthocladius (Pseudorthocladius) digitus
sp. n.
Figures 14-18
Diagnosis.
The male imago can be distinguished from the known species of the genus by the following combination of characters: anal point rounded and reaching beyond the caudal margin of Tergite IX; inferior volsella
finger-shaped
; squama bare; anal lobe reduced.
Description.
Adult male (n = 1). Total length 2.43 mm. Wing length 1.55 mm. Total length/wing length 1.57. Wing length/length of profemur 2.54.
Coloration. Head, abdomen, legs brown; thorax with yellow ground with brown postnotum and preepisternum.
Head. Antenna with 13 flagellomeres. Terminal flagellomere length 300
μm
. AR 0.74. Temporal setae 7, including 4 inner verticals, 3 outer verticals. Clypeus with 2 setae. Tentorium 110
μm
long, 24
μm
wide. Palpomere lengths (in
μm
): 29, 31, 60, 108, -.
Wing (Figure 14). Anal lobe reduced. Brachiolum with 1 seta; R with 7 setae; R1 with 1 seta; other veins bare. Squama bare. Costa extention 41
μm
long. Cu1 slightly curved.
Figures 14-18.
Pseudorthocladius (Pseudorthocladius) digitus
sp. n., male. 14 wing 15 thorax 16 hypopygium (dorsal view) 17 hypopygium (ventral view) 18 anal point and inferior volsella.
Thorax (Figure 15). Antepronotum with 5 lateral setae, dorsocentrals 7, acrostichals 2, prealars 5. Scutellum with 9 setae.
Legs. Pulvilli present. Spur of fore tibia 50
μm
long, spurs of mid tibia both 29
μm
long; hind tibia with a long spur 60
μm
long, a short spur 29
μm
long and comb
composed
of 12 spines. Width at apex of fore tibia 43
μm
, of mid tibia 36
μm
, of hind tibia 45
μm
. Lengths (in
μm
) and proportions of legs as in Table 5.
Table 5. Lengths (in
μm
) and proportions of legs of
Pseudorthocladius (Pseudorthocladius) digitus
sp. n.
Hypopygium (Figures 16-18). Laterosternite IX with 3 setae. Anal point (Figure 18) rounded and reaching beyond caudal margin of Tergite IX, maximum width 22
μm
, with 10 long marginal setae. Phallapodeme 48
μm
long. Transverse sternapodeme 50
μm
long with small oral projection. Virga absent. Gonocoxite 178
μm
long with 6 strong setae along inner margin. Inferior volsella (Figure 18)
finger-shaped
,
parallel-sided
and rounded in the apex, bearing some weak setae along the margin and covered by microtrichia. Gonostylus 84
μm
long, narrow at base, widen to the distal, with 3-4 setae along inner margin. Crista dorsalis visible, relatively low. Megaseta 10
μm
long. HR 2.11. HV 2.89.
Female, pupa and larva unknown.
Type materials.
Holotype: ♂ (BDN No.05327), China: Fujian Province, Wuyi City, Wuyi Mountain,
27°45'N
,
118°03'E
, 26.iv.1993, Xinhua Wang, sweep net.
Etymology.
The specific name is from Latin, digitus, meaning
"finger"
, referring to the
finger-shaped
inferior volsella.
Remarks.
Pseudorthocladius (Pseudorthocladius) digitus
sp. n. is close to
Pseudorthocladius (Pseudorthocladius) yakuxeyeus
(Sasa & Suzuki, 2000) in the antenna ratio (0.71-0.74) and
finger-liked
inferior volsella. But it can be separated from the latter by having rounded anal point reaching beyond the caudal margin of tergite IX, reduced wing anal lobe and bare squama.
Distribution.
The new species is known from Fujian Province in Oriental China.