Dicrotendipes saetanumerosus, Qi, Xin, Lin, Xiao-Long & Wang, Xin-Hua, 2012

Qi, Xin, Lin, Xiao-Long & Wang, Xin-Hua, 2012, Review of Dicrotendipes Kieffer from China (Diptera, Chironomidae), ZooKeys 183, pp. 23-36 : 25

Dicrotendipes saetanumerosus sp. n. Figs 6−8

Diagnosis.

Tergite IX with more than 30 median setae; anal point broad, bare; superior volsella pediform, with 11−16 lateral setae.

Description.

Male imago (n = 7)

TL 3.65−4.30, 3.82 mm. WL 1.80−2.30, 2.10 mm. TL/WL 1.87−2.03, 1.93. WL/Pfe 1.86−2.04, 1.96.

Coloration.Head, thorax and abdominal tergite VII−IX brown, abdominal tergite I−VI pale yellow; legs yellowish-brown.

Head. AR 2.38−2.55, 2.40. Temporal setae 19−22, 20. Clypeus with 16−20, 17 setae. Tentorium 120−155, 136 µm long, 26−35, 30 µm wide. Palpomere lengths (in µm): 32−53, 45; 58−68, 62; 155−185, 167; 165−195, 172; 235−260, 241. L: 5th/3 rd 1.41−1.52, 1.46. Frontal tubercle 7.50−15.00, 10.00 µm long, 5.00−6.50, 5.52 µm wide.

Wing (Fig. 6).Wing transparent, without markings. VR 1.05−1.06, 1.05. B 2−3, 2 setae; R with17−20, 18 setae; R1 with 12−16, 14 setae; R4+5 with 17−19, 18. Squama with 4−9, 6 setae.

Thorax.Dorsocentrals 8−11, 10; acrostichals 9−16, 12; prealars 4−5, 4. Scutellum with 8−11, 9 setae.

Legs. Fore tibia with rounded scale lacking spur. Spurs on mid tibiae 23-28, 26 µm and 25−30, 26 µm long, including combs 20-23, 21 µm and 15-18, 16 µm long; spurs on hind tibia 23−28, 26 µm and 25−30, 27 µm long including combs 20-23, 21 µm and 15-18, 16 µm long. Width at apex of front tibia 58−68, 60 µm, of mid tibia 58−73, 63 µm, of hind tibia 63−85, 70 µm. Lengths (in µm) and proportions of legs in Table 3.

Hypopygium(Figs 7−8). Anal point 40−50, 45 µm long, broad, bare. Tergite IX with more than 30 median setae; laterosternite IX with 2−4, 3 setae. Phallapodeme 90−115, 97 µm long; transverse sternapodeme 40−50, 45 µm long, laterally narrowed, medially broad, inverted U-shaped. Gonocoxite 165−230, 180 µm long. Superior volsella 68−77, 70 µm long, 38−68, 50 µm wide; pediform, with 11−16 lateral setae. Inferior volsella 138−163, 142 µm long; elongate, apex bulbiform, with 9−12, 10 apical setae in 2 rows. Gonostylus 180−195, 186 µm long; slightly curved medially, with 5−7, 6 apical setae along inner margin. HR 0.80−0.90, 0.82; HV 1.83−2.05, 1.87.

Type materials.

Holotype: 1♂, China, Shandong: Taian City, Tai Moutain 36°11.37'N, 117°08.13'E, 25.v.1994, Wang XH, light trap. Paratypes (8): Shandong: 1♂, Taian City, Tai Moutain, 36°11.37'N, 117°08.13'E, 25.v.1994, Wang XH, light trap; Hubei: 2♂♂, Shiyan City, Wudang Mountain, 32°30.22'N, 111°05.09'E, 16.vii.1997, Wang BX, light trap; Zhejiang: 5♂♂, Kaihua County, 29°05.57'N, 118°23.19'E, 13.iv.2011, Lin XL, light trap.

Etymology.

The species name is from Latin, saeta, meaning setae, numerosus, meaning numerous, referring to the tergite IX of the species with more than 30 setae, which is unique within the genus.

Remarks.

Dicrotendipes saetanumerosus sp. n. closely resembles Dicrotendipes tamaviridis Sasa, 1981 in the structure of hypopygium, but the new species Dicrotendipes saetanumerosus can be separated from Dicrotendipes tamaviridis on the basis of following points: (1) the anal point of Dicrotendipes saetanumerosus sp. n. is broad and not expanded apically, but the anal point of Dicrotendipes tamaviridis is slender and expanded apically; and (2) the tergite IX in Dicrotendipes saetanumerosus sp. n. has more than 30 median setae, while Dicrotendipes tamaviridis has nomedian setae and 8−9 setae in the base of anal point.

Distribution.

The species is known from Hubei, Shandong and Zhejiang Province of China.