Review of Dicrotendipes Kieffer from China (Diptera, Chironomidae)
Author
Qi, Xin
Author
Lin, Xiao-Long
Author
Wang, Xin-Hua
text
ZooKeys
2012
183
23
36
http://dx.doi.org/10.3897/zookeys.183.2834
journal article
http://dx.doi.org/10.3897/zookeys.183.2834
1313-2970-183-23
Dicrotendipes nudus
sp. n.
Figs 1−5
Diagnosis.
R1 and R4+5 without seta; tergite IX without median seta; anal point with basal peduncle and bulbous ventral extension, 6−9 dorsal basal setae and 6 lateral setae.
Description.
Male imago (n = 18)
TL 2.65−3.20, 2.95 mm. WL 1.65−2.00, 1.82 mm. TL/WL 1.58−1.94, 1.72. WL/Pfe 2.14−2.43, 2.31.
Coloration.Head, thorax and abdominal tergite VI−IX brown, abdominal tergite I−V pale yellow; legs yellowish-brown.
Head. AR 1.85−2.12, 2.02. Temporal setae 10−16, 13. Clypeus with 12−19, 16 setae. Tentorium 100−163, 146
µm
long, 20−35, 28
µm
wide. Palpomere lengths (in
µm
): 34−42, 35; 43−55, 48; 40-45; 108−130, 121; 130−148, 138; 163−215, 179. L: 5th/3 rd 1.35−1.67, 1.58. Frontal tubercle 10.20−17.50, 14.20
µm
long, 5.00−7.50, 6.20
µm
wide.
Wing (Fig. 1).Wing transparent, without markings. VR 1.11−1.16, 1.13. B 1−3, 2 setae; R with 7−11, 9 setae; R1 and R4+5 without seta. Squama with 4−6, 5 setae.
Thorax.Dorsocentrals 8−11, 10; acrostichals 4−5, 4; prealars 3−4, 4. Scutellum with 4−9, 7 setae.
Legs. Fore tibia with rounded scale lacking spur. Spurs on mid tibiae 23-25, 24
µm
and 18−25,20
µm
long, including combs 26-32, 30
µm
and 26-32, 30
µm
long; spurs on hind tibia 22-32, 26
µm
and 18−20,19
µm
long including combs 24-28, 26
µm
and 22-25, 23
µm
long. Width at apex of front tibia 53−58, 55
µm
, of mid tibia 50−55, 53
µm
, of hind tibia 55−65, 59
µm
. Lengths (in
µm
) and proportions of legs in Table 1.
Hypopygium(Figs 2−5). Anal point 40−60, 50
µm
long, with basal peduncle and bulbous ventral extension, 6−9 dorsal basal setae and 6 lateral setae. Tergite IX without
median
setae; laterosternite IX with 3−4, 3 setae. Phallapodeme 95−103, 97
µm
long; transverse sternapodeme 40−50, 45
µm
long, laterally narrowed, medially broad, inverted U-shaped. Gonocoxite 142−165, 156
µm
long. Superior volsella 83−92, 85
µm
long, 23−27, 25
µm
wide; digitiform with short ventral extension; with numerous micro setae and 3−4 short apical setae (Figs 4−5). Inferior volsella 128−155, 142
µm
long; elongate, apex bulbiform, with 6−9, 8 apical setae in 2 rows. Gonostylus 150−195, 172
µm
long; slightly curved medially, with 5−7, 6 apical setae along inner margin. HR 0.73−1.17, 0.82; HV 1.82−1.88, 1.85.
Type materials.
Holotype: 1♂, China, Hebei: Chicheng County,
40°54.16'N
,
115°54.08'E
, 21.vii.2001, Guo YH, light trap. Paratypes (17): Hebei: 2♂♂, Chicheng County,
40°54.16'N
,
115°54.08'E
, 21.vii.2001, Guo YH, light trap; Xinjiang: 5♂♂, Hebahe County,
48°04.30'N
,
86°24.47'E
, 15.vii.2002, Tang HQ, light trap; Zhejiang: 3♂♂, Ningbo City,
29°48.36'N
,
121°34.53'E
, 10.v.2010, Qi X, sweeping method; 1♂, Sanmen County,
29°05.55'N
,
121°23.45'E
, 28.vii.2010, Lin XL, sweeping method; 6♂♂, Tiantai County, Huading Mountain,
29°14.51'N
,
121°06.31'E
,13.iv.2011, Lin XL, light trap.
Etymology.
The species name is from Latin, nudus, meaning bare, referring to R1 and R4+5 without seta, which is unique within the genus.
Remarks.
Dicrotendipes nudus
closely resembles
Dicrotendipes nervosus
, but can be separated by R1 and R4+5 of
Dicrotendipes nudus
without seta; while in
Dicrotendipes nervosus
, R1 with 11−20, 15 setae, R4+5 with17−28, 22 setae.
Distribution.
The species is known from Hebei, Zhejiang Province and Xinjiang Uygur Autonomous Region of China.
Figures 1-5.
Dicrotendipes nudus
sp. n., male 1 wing 2 hypopygium (dorsal view) 3 hypopygium (ventral view) 4-5 superior volsella.
Table 1. Lengths (in
µm
) and proportions of legs of
Dicrotendipes
nudus sp. n.