Stenochironomus linanensis, Qi, Xin, Lin, Xiaolong, Liu, Yuedan & Wang, Xinhua, 2015

Qi, Xin, Lin, Xiaolong, Liu, Yuedan & Wang, Xinhua, 2015, Two new species of Stenochironomus Kieffer (Diptera, Chironomidae) from Zhejiang, China, ZooKeys 479, pp. 109-119 : 111-113

Taxon classification Animalia Diptera Chironomidae

Stenochironomus linanensis sp. n. Figs 11-18

Diagnosis.

The adult male of Stenochironomus linanensis sp. n. can be distinguished from all other species of Stenochironomus by the following combination of characters: wings transparent, body yellow, superior volsella finger-like, with 9 long setae, elongated inferior volsella with 4 long setae and one well-developed terminal spine, tergite IX with 10−15 long setae medially.

Description.

Male imago (n = 5). Total length 2.9−3.8 mm. Wing length 1.4−1.5 mm. Total length / wing length 1.98−2.41. Wing length / length of profemur 1.30−1.57.

Coloration. Head yellow. Thorax greenish yellow. Wings transparent, without any pigmentation. Abdomen yellow, hypopygium brown. Legs pale yellow.

Head (Fig. 11). AR 1.20−1.32. Temporal with 8−14 setae. Clypeus with 9−10 setae. Tentorium 153−156 mm long, 37−42 mm wide. Stipes 72−95 µm long, 5−6 µm wide. Palpomere lengths (in mm): 45−47, 28−33, 53−60, 75−90, 110−120. Palpomere ratio (5th/3rd) 2.00−2.07.

Wings (Fig. 12). VR 1.07−1.20. Brachiolum with 2 setae; R with 16−23 setae, R1 with 17−18 setae, R4+5 with 22−28 setae. Squama with 5−7 setae.

Thorax (Fig. 13). Dorsocentrals 9−13, acrostichals 9−14, prealars 4−5. Scutellum with 5−6 setae.

Legs. Fore leg: width at apex of tibia 33−47 mm, tibia with scale 33−46 µm long, with 2−3 strong setae (Fig. 14). Mid leg: width at apex of tibia 50−65 mm, tibia with two apical spurs 25−28, 30-40 μm long. Hind leg: width at apex of tibia 50−60 mm, tibia with two apical spurs 32−39, 35-40 μm long. Mid and hind tibiae with fused combs (Fig. 15-16), each comb 18−22 mm long. Lengths (in mm) and proportions of legs in Table 3.

Hypopygium (Fig. 17). Anal point 65−73 mm long, 14−20 µm wide at base, 6−8 µm wide at apex, apex of anal point slightly swollen and rounded. Tergite IX with 10−15 long setae medially, posterior margin of tergite IX with 12−14 setae and 4 spines. Phallapodeme 70−80 mm long; transverse sternapodeme 35−38 mm long. Gonocoxite 160−180 mm long. Superior volsella finger-like, 53−63 mm long, 25−27 mm wide, with 9 long setae (Fig. 18). Inferior volsella elongated, 160−170 mm long, with 4 long setae and one well-developed terminal spine. Gonostylus 123−170 mm long, with 9 long setae along inner margin in distal 1/2. HR 0.94−1.47, HV 1.98−2.35.

Female, pupa and larva.

Unknown.

Type material.

Holotype: Male, CHINA, Zhejiang, Linan City, Qingliangfeng Mountain, 16.v.2012, leg. XL Lin, sweep net. 4 Paratypes: 4 males, same data as holotype.

Etymology.

The specific epithet is an adjective referring to the type locality, Linan City.

Remarks.

Stenochironomus linanensis sp. n. is similar to Stenochironomus macateei (Malloch, 1905), Stenochironomus maculatus Borkent, 1984 and Stenochironomus recticaudatus Borkent, 1984 in the structure of the hypopygium and the inferior volsella with a strong terminal spine, but can be separated from these species by the differences given in Table 4.

Distribution.

The species is known from Zhejiang Province of Oriental China.