Claudiotendipes gilbertoi, Pinho & Fusari, 2023

Pinho, Luiz Carlos & Fusari, Lívia Maria, 2023, New species of Claudiotendipes Andersen, Mendes & Pinho and Tapajos Trivinho-Strixino, Silva & Oliveira from Brazil (Diptera, Chironomidae, Chironominae), Revista Brasileira de Entomologia (e 20230067) 67, pp. 1-5 : 1-4

Claudiotendipes gilbertoi sp. n. ( Figs. 1 and 3 )

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Diagnosis: The new species can be separated from its congeners by combination of a gently curved superior volsella, AR 0.43–0.69 and dark brown coloration of head and abdomen.

Male (n = 3, unless otherwise stated): Total length 2.73–3.12 mm. Wing length 1.59–1.98 mm. Total length / wing length 1.57–1.86.Wing length / length of profemur 2.32–2.61.

Coloration: Antenna and legs light brown; head and thorax dark brown; abdomen dark brown; wings hyaline without markings.

Antenna: AR 0.43–0.69. Ultimate flagellomere 196–323 µm long.

Head: Temporal setae 12. Clypeus with 10–11 setae. Frontal tubercle barely indicated as pale area. Tentorium 105–120 µm long, 25–27 µm wide. Stipes 117–125 µm long. Palp segment lengths (in µm): 35–40; 37–50; 154 (1); 149 (1); 234 (1). Third palpomere with 2 sensilla, longest 12 µm long.

Thorax: Antepronotum bare. Dorsocentrals 9–12; acrostichals 12–14, starting close to antepronotum; prealars 3. Scutellum with 6–10 setae, uniserial.

Wing ( Fig. 1A ): VR 1.29–1.33. Brachiolum with 1 seta, R with 17–18, R 1 with 9–11, R 4+5 with 29–36 setae, other veins and cells bare. Squama bare.

Legs: Scale of fore tibia 6–8 µm long; spur of mid tibia 44–49 µm long, of hind tibia 34–49 µm long. Comb on mid tibia 39–49 µm long, of hind tibia 54–59 µm long. Width at apex of fore tibia 44–59 µm, of mid tibia 49–59 µm, of hind tibia 59–74 µm. Lengths and proportions of legs as in Table 1.

Hypopygium ( Figs.1B and C ): Tergite IX covered with microtrichia, without median setae, and with small projections at each side of anal point; laterosternite IX with 2 setae. Anal point nearly parallel-sided, 30–37 µm long, 7–8 µm wide, with 2–3 setae to each side of base. Transverse sternapodeme 67–72 µm long, nearly straight.Phallapodeme not measurable. Gonocoxite 115–149 µm long. Superior volsella gently curved, 62–77 µm long, with 2 dorsal and 1 apical seta. Median volsella 5–7 µm long, with 1 seta. Inferior volsella 62–67 µm long, with 2 simple setae and 1 stout apical seta on main branch and 5 bifid to trifid setae on side-branch. Gonostylus 112–127 µm long. HR 1.00–1.13. HV 2.43–2.84.

Female and immatures: Unknown.

Type material: Holotype male, slide-mounted, BRAZIL, Rio Grande do Sul, Jaquirana, Rio Tainhas, Passo da Ilha , 29°05’11”S 50°21’52”W, 10.xi.2007, light trap,coll. L.M.Fusari & A.M.O. Pes ( INPA) . Paratypes: 1 male, slide-mounted, same data as previous ( INPA) . 1 male, slide-mounted, BRAZIL, Rio Grande do Sul, Cambará do Sul, PARNA Serra Geral, Córrego Lagoa Suspensa , 25.ix.2016, sweeping, coll. T . Duarte et al. ( CE-MHS) .

Etymology: The species is in honor of Professor Dr. Claudio Gilberto Froehlich, for the enormous contribution to research on systematics of aquatic insects from the Neotropical region.

Remarks: The new species resembles C.bolivianus by having general brown coloration ( C. froehlichi and C. epleri are pale), but is easily distinguished by the gently curved superior volsella and bifid to trifid setae on side branch of inferior volsella. C. bolivianus has medially bent superior volsella and simple setae on side branch of inferior volsella.

Distribution: The species occurs in Atlantic forest from Rio Grande do Sul, southern Brazil ( Fig. 3 ).

Figures

Figure 1 Claudiotendipes gilbertoi sp. n., male. (A) Wing; (B) Hypopygium, dorsal view; (C) Hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.

Figure 3 Distribution of Tapajos Trivinho-Strixino, Silva & Oliveira and Claudiotendipes Andersen, Mendes & Pinho.