Microtendipes zhejiangensis sp.n.

Qi, Xin, Lin, Xiaolong & Wang, Xinhua, 2012, A new species of the genus Microtendipes Kieffer, 1915 (Diptera, Chironomidae) from Oriental China, ZooKeys 212, pp. 80-89 : 84-87

Microtendipes zhejiangensis sp.n. Figs 2−5

Diagnosis.

The male imago can be distinguished from known species of the genus by the following combination of characters: superior volsella hook-like, apex obtuse, with 7−8 dorsal setae and 4 long basal setae; median volsella absent; absence of pigment marks in wing; acrostichals 2−3.

Description.

Male imago (n = 3). Total length 5.75−6.05 mm. Wing length 3.38−3.48 mm. Total length/wing length 1.65−1.79. Wing length/length of profemur 2.25−3.71.

Coloration. Head yellow. Thorax greenish yellow with scutum and postnotum brown. Abdomen greenish yellow, Abdominal tergites I−VI pale green, tergites VII−IX and hypopygium brown. Legs: apical 1/3 of fore femur, basal 1/2 of fore tibia and apical 1/10 of tibiae brown; remaining parts greenish yellow.

Head.AR 1.82−2.48. Temporal setae 16−19 including 6−8 inner verticals, 6−10 outer verticals, and 2−3 postorbitals. Clypeus with 37−38 setae. Tentorium 205−240 mm long, 55−70 mm wide. Palpomere lengths (in mm): 60−65, 63−73, 310−330, 330−350, 460−480. L: 5th/3rd 1.39−1.54.

Wing(Fig. 2). VR 1.07−1.13. B with 4 setae; R with 27−28, R1 with 24−32, R4+5 with 31−49 setae. Squama with 18−20 setae.

Thorax. Dorsocentrals 17, acrostichals 2−3, prealars 4. Scutellum with 10−25 setae.

Legs(Fig. 3). Distal half of front femur with 23−25 proximally directed setae in 2 rows, 180−200 mm long. Spur on median tibiae 25−33 mm long including 28−30 mm long comb, unspurred comb 25−33 mm long; spur on posterior tibia 33−40 mm long including 25−33 mm long comb, unspurred comb 28−30 mm long. Width at apex of front tibia 80−87 mm, of middle tibia 83−85 mm, of hind tibia 90−95 mm. Lengths (in mm) and proportions of legs in Table 1.

Hypopygium (Figs 4−5). Anal point 78−90 mm long, parallel-sided, slender, apex rounded. Tergite IX with 6−9 long setae medially and 22−36 setae along posterior margin. Phallapodeme 90−113 mm long; transverse sternapodeme 50−70 mm long. Gonocoxite 223−238 mm long. Superior volsella 105−125 mm long, hook-like, apex obtuse, with 7−10 dorsal setae and 4 long basal setae. Inferior volsella digitiform, 110−140 mm long, narrowed in apical 1/2, with 29−32 setae. Gonostylus 143−148 mm long, with 9−10 setae along inner margin in distal 1/2. HR 1.51−1.64, HV 4.08−4.32.

Female, pupa and larva are unknown.

Type materials.

Holotype: 1♂, China, Zhejiang: Kaihua County, Gutian Mountain, 29°14.27'N, 118°07.13'E, 7.iv.2011, Lin XL, sweeping method. Paratype: 2♂♂, same as holotype.

Etymology.

The species is named after the type locality, using the Latin suffix -ensis, denoting place of origin.

Remarks.

The new species is similar to Microtendipes pedellus (De Geer), but can be separated from Microtendipes pedellus (De Geer) on the basis of the following: (1) presence of median volsella in Microtendipes pedellus (De Geer), with 3 long setae in the median volsella; whereas absence of median volsellain Microtendipes zhejiangensis sp.n.; (2) the inferior volsella of Microtendipes pedellus (De Geer) digitiform, with 20 setae, whereas the inferior volsella of Microtendipes zhejiangensis sp.n. narrowed in apical 1/2, with 29−32 setae; (3) HV of Microtendipes pedellus (De Geer) 2.98−3.36, whereas HV of Microtendipes zhejiangensis sp.n. 4.08−4.32.

The new species is also similar to Microtendipes nitidus (Meigen, 1818). The superior volsella of Microtendipes nitidus (Meigen) has a basal expansion bearing more than 5 long setae mesally, but the superior volsella of Microtendipes zhejiangensis sp.n. is not expanded basally, with 4 long basal setae separated from each other.

This new species can be separated from Microtendipes quasicaducas Qi & Wang on the basis of the following characters: (1) the anal point of Microtendipes quasicaducas Qi & Wang slender, tapering from base, and apically pointed; whereas the anal point of Microtendipes zhejiangensis sp.n. parallel−sided, slender, apex rounded; (2) the wing with pigment marks in Microtendipes quasicaducas Qi & Wang, but the wing without marks in Microtendipes zhejiangensis sp.n.; (3) the acrostichals 2−3 in Microtendipes zhejiangensis sp.n., whereas the acrostichals of Microtendipes quasicaducas Qi & Wang lacking.

This new species can also be separated from Microtendipes zhamensis Qi & Wang, 2006 on the basis of the following characters: (1) the anal point of Microtendipes zhamensis Qi & Wang slender, pointed; whereas the anal point of Microtendipes zhejiangensis sp.n. parallel-sided, slender, apex rounded; (2) presence of median volsella in Microtendipes zhamensis Qi & Wang, with 2 setae in median volsella; absence of median volsellain Microtendipes zhejiangensis sp.n.; (3) the inferior volsella of Microtendipes zhamensis Qi & Wang digitiform, with 24 setae; whereas the inferior volsella of Microtendipes zhejiangensis sp.n. narrowed in apical 1/2, with 29−32 setae; (4) the acrostichals 2−3 in Microtendipes zhejiangensis sp.n., whereas the acrostichals of Microtendipes zhamensis Qi & Wang lacking.

Distribution.

The species is known from Zhejiang Province of China.