Compteromesa haradensis Niitsuma et Makarchenko 1997
Creators: name: Shi, Jianyu
name: Niitsuma, Hiromi
name: Tang, Hongqu
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Compteromesa
Compteromesa haradensis

description: Compteromesa haradensis Niitsuma et Makarchenko
(Figures 1–3)
Compteromesa haradensis Niitsuma et Makarchenko, 1997: 614.
Compteromesa sp., Ueno & Iwakuma, 1996: 124.
Material examined. 1 Pe, CHINA: Anhui Province, Huangshan City, Tangkou Town, Fu Stream, 30°04.317'N, 118°09.320'E, alt. 477 m, 05.v.2014; 1M, Fujian Province, Fuzhou City, Minqing County, Huangchulin NNR, 26°16.655'N, 118°42.313'E, alt. 300 m, 9.xi.2012; 1Pe, Taiwan Province, Jiayi County, Mt. Ali NNP, 23°28.724'N, 120°42.924'E, alt. 1267 m, 20.iii.2013; 1M, 2 Pe, Guangdong Province, Puning City, Yanzi Mountain stream, 23°13.526'N, 116°4.745'E, alt. 220 m, 6.ii.2021, Lintao Huang. 1Pe as previous except 1.x.2016; 3 Pe, 1L, Guangdong Province, Guangzhou City, Conghua District, Lyutian Town, Fentian country, 23°50.825′N, 113°56.244′E, alt. 228 m, 17.iv.2015; 3Pe, Hainan Province, Qiongzhong County, Limuling NNR, 19°10.755'N, 109°45.074'E, alt. 865 m, 15.iv.2016; 1 Pe, Guangxi Province, Hezhou City, Daguishan NNR, 24º09′48.258N, 111º42′58.842E, alt. 195 m, 25.xi.2013, Yuanda Lei; 1L, Sichuan Province, Aba Prefecture, Jiuzhaigou County, Bai River, alt., 2105 m, 20.vii.2019, B. Wang; 1 Pe, Yunnan Province, Anning City, Shuishenqiao scenic spot, 25°3.727′N, 102°21.369′E, alt. 1834 m, 26.v.2018; 2Pe, Yunnan Province, Xishuangbanna Prefecture, Mengla County, Mengyuan Scenic spot, 21° 43.687'N, 101° 23.074'E, alt. 722 m, 18.ii.2019.
Comparative material examined. Holotype of Compteromesa haradensis, M with Pe and Le (NSMT), JAPAN: Shizuoka City, Harada River, 8.iv.1995 (emerged 14.iv.1995). Non-types. M and F each with Pe, JAPAN: Fukushima, Iwaki, Yaguki, small stream, 19.iv.2009 (emerged 29–30.iv.2009).
Description. Male (n = 2). Total length 2.7–2.9 mm, wing length 1.7–2.0 mm.
Coloration. Generally purple brown or dark brown except for pale brown scutellum and hypopygium. Lateral vittae of scutum dark brown and median vittae light brown (Fig. 1A).
Head. Antenna with 13 flagellomeres, terminal flagellomere 485–490 µm long, AR 1.01–1.04. Eyes with long, parallel-sided dorsomedial extension.
Thorax (Fig. 1B). Humeral pit distinct, elongated, 50–55 µm long and 20–25 µm wide, composed of several small pits (Fig. 1C). Scutellars 12–15, biserial.
Wing. MCu 80–90 µm long. Membrane apically with setae. Squama with 10–18 setae.
Legs. Tibial spurs slightly sinuate. Hind tibia with outer spur 50–60 µm long, inner spur 30–40 µm long, and comb composed of 10–14 spines. LR 1 0.91–0.92, BV 1 2.30–2.33, SV 1 1.98–2.00; LR 2 0.52–0.54, BV 2 3.25–3.28, SV 2 3.77–3.84; LR 3 0.59–0.61, BV 3 2.79–2.84, SV 3 3.02–3.11.
Hypopygium (Fig. 1D). T IX with 10–12 anal median setae on each side. Anal point 30–35 µm long and 15–20 µm wide at base, apically with needle-like spine 25 µm long. Gonocoxite 200–230 µm long; inferior volsella small, with many setae on tubercles; superior volsella small; median volsella reduced to apodeme, with transverse basal bar. Gonostylus slender, 90–110 µm long, with megaseta slender, slightly sinuate, and distinctly longer than distal thickness of gonostylus (Fig. 1E). HR 2.2–2.3.
Pupa (n = 10). Total length 3.5–5.3, 4.2 mm. Cephalothorax yellowish gray; abdomen pale brown, with heavily pigmented apophyses. Posterior spinules on T II–VI dark brown.
Cephalothorax. Frontal apotome (Fig. 2A) wrinkled, without cephalic tubercle and frontal seta. Thoracic horn (Fig. 2C) 290–375, 327 µm long, 2.67–3.83, 3.22 times as long as its maximum width; outer margin with 6–10 spines including 3–4 stronger subapical spines. Scutum (Fig. 2B) with dorsal surface rugulose along median suture. Prealar tubercle absent. Antepronotals consisting of 2 median and 2 lateral setae; median setae 100–185, 148 µm long, distinctly stronger and longer than laterals. Three precorneals present; usually anterior two setae slender, 60–140, 112 µm long; posterior seta relatively strong, thick, and 120–180, 145 µm long. Dorsocentrals 4, minute, and arranged rectangularly.
Abdomen (Figs 2D–E). T I bare. T II–VI each with extensive, subquadrate spinule patch; posterior spinules stronger. Rows of anteriorly directed, thin spinules present, posterior to darkened strong spinules on T II–IV. T VII– VIII each with elongated, wedged-shaped spinule patch medially. T IX anterolaterally with paired spinule patches. S I bare, S II with median spinule patch, S III–IV and VIII with longitudinal weak spinule patch along lateral muscle marks. S V–VII with extensive patch of fine spinules. Vortex present on segments IV–VI, most distinct on segment IV. Pedes spurii B present on segment II. Male S VIII with posterior row of 17–28, 22 spines, usually its row interrupted at middle. Female S VIII (Fig. 2F) posteriorly with paired triangular projections. Segment I with 5D, 1V and 3 L setae; II with 5D, 3V and 4 L; III–VI with 5D, 4–5V and 4 L; VII with 5D, 5 V, 4 LS; and VIII with 2D, 2V and 5 LS. Anal lobe 240–320, 282 µm long, almost twice as long as width, with fringe of 28–42, 36 taeniae, arranged somewhat sparsely in anterior 2/3 and densely in distal 1/3; 4 macrosetae curved distally, 220–300, 275 µm long. Dorsal seta absent. Genital sac of male seldom extending apex of anal lobe.
Larva (n = 1–2). Total length 5.4–5.7 mm. Head capsule 300–325 µm long, and 200–220 µm wide.
Coloration. Head capsule generally pale yellow; mentum dark brown on lateral teeth, pale on median teeth; apex of mandible dark brown, postoccipital margin brown.
Antenna (Fig. 3A). With 4 segments; 3rd segment reduced, shorter than 4th. Basal segment 55–58 µm long, almost 3 times as long as width, with ring organ located 1/5 from base and apical sense pit located 1/3 from apex. AR 1.46–1.83. Blade 45–53 µm long, far beyond antennal apex, and 1.5 times as long as flagellum.
Labrum. Labral SI apically pectinate, SII–IV simple. Labral lamellae serrated, apically with ca. 30 teeth. Pecten epipharyngis consisting of 3 simple scales. Premandible (Fig. 3B) 45–48 µm long, apically notched or bifid, without prominent basal tooth or brush.
Mandible (Fig. 3C). Relatively stout, with one apical and 4 inner teeth; combined width of inner teeth subequal to length of apical tooth. Inner margin smooth, without spines. Seta subdentalis slender, extending apex of 3rd inner tooth. Seta interna with 4 main branches, each tri- to multifid apically.
Mentum (Fig. 3D). With 2 median and 10–11 pairs of lateral teeth; median tooth distinctly paler than others; 1st and 3rd lateral teeth adpressed to large 2nd tooth. Ventromental plate broadened basally, with maximum thickness 18–20 µm, bearing 6–12 weak beards, seldom extending to outer margin of ventromental plate. Two large genal setae close to outer margin of ventromental plate. Distance between two setae submenti 50–73 µm, and length of postmentum 130–165 µm.
Body. Without conspicuous body setae. Procercus 20–30 µm wide and 25–40 µm high, apically with 7 anal setae, 400–500 µm long. Two pairs of anal tubules 100–120 µm long, almost 2/3 times as long as posterior parapod.
Distribution. Palaearctic and Oriental China (Anhui, Fujian, Taiwan, Guangdong, Guangxi, Hainan, Sichuan and Yunnan Provinces), and Palaearctic Japan (Shizuoka and Fukushima Prefectures).
Remarks. In the original description of this pupa, Niitsuma & Makarchenko (1997: 613) wrote, “Frontal apotome with very short frontal setae” and “Abdominal tergites I and IX without shagreen.” A reexamination of the holotype revealed that the authors mistook short wrinkles on the frontal apotome for frontal setae and overlooked anterolateral patches of weak spinules. In the Chinese population, the frontal apotome has no seta and the anal tergite possesses anterolateral patches of spinulation as in the Japanese population.
However, some small differences should be noted here. In Chinese population, the larval mentum has pale median teeth and 10–11 pairs of dark brown lateral teeth, whereas the holotype collected from Japan possesses dark brown median teeth and seven lateral teeth. These differences are regarded as geographical variations, judging from similarities of many other features.
The male of Compteromesa sp. recorded by Ueno & Iwakuma (1996) from Miyatoko Mire, Fukushima Prefecture, Japan, belongs to this species judging from the figures of wing and hypopygium, although detailed interpretation was not given.
description: Published as part of Shi, Jianyu, Niitsuma, Hiromi & Tang, Hongqu, 2021, Compteromesa Sӕther (Diptera, Chironomidae, Prodiamesinae) newly recorded in China with the description of a new species, pp. 169-176 in Zootaxa 5082 (2) on pages 170-174, DOI: 10.11646/zootaxa.5082.2.6, http://zenodo.org/record/5785403