Tapajos froehlichi, 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 : 4

Tapajos froehlichi sp. n. ( Figs. 2 and 3 )

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Diagnosis: The new species can be separated Tapajos cristinae by having squama bare, scutellum without setae and posterior margin of tergite IX quadrate.

Male (n = 2, unless otherwise stated): Total length 1.79–2.19 mm. Wing length 0.97–1.02 mm. Total length/wing length 1.99–2.07. Wing length/length of profemur 2.34–2.44.

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

Antenna: AR 1.29 (1). Ultimate flagellomere 417 (1) µm long.

Head: Temporal setae 6–9, uniserial.Clypeus with 10–11 setae. Frontal tubercle 5 µm long. Tentorium 50–75 µm long, 17–22 µm wide. Stipes 82–85 µm long. Palp segment lengths (in µm): 18–20; 18–20; 55(1); 72(1); 105(1). Third palpomere with 2(1) sensilla, longest 15(1) µm long.

Thorax ( Fig.2B ): Dorsocentrals 6; acrostichals 8–10, starting close to antepronotum; prealars 2. Scutellum without setae. Squama bare.

Wing ( Fig. 2A ): VR 1.28–1.33. Brachiolum with 1 seta, R 4+5 with 2 setae at apex, other veins and cells bare. Squama bare.

Legs: Inner scale of fore tibia 12–17 µm long; spurs of mid tibia 30–42 and 17–27 µm long, of hind tibia 22–32 and 20–25 µm long. Comb on mid tibia 25–30 and 16–18 µm long, of hind tibia 42–45 and 16–18 µm long. Width at apex of fore tibia 37–42 µm, of mid tibia 37–42 µm, of hind tibia 42–45 µm. Lengths and proportions of legs as in Table 2.

Hypopygium ( Figs. 2C and D ): Tergite IX with quadrate posterior margin, bearing four 4 setae each side; with 1–2 median setae; tergal band well developed; laterosternite IX without setae. Anal point parallel-sided, 17–30 µm long, 5–6 µm wide, with 2 setae to each side of base. Transverse sternapodeme 27–30 µm long. Phallapodeme 40–50 µm long. Gonocoxite 77–85 µm long. Superior volsella with a 25–32 µm long bare dorsal lobe and a 30–37 µm long densely trichiose ventral lobe, with 4 short basal inner setae. Inferior volsella 40–50 µm long, with 4 apical setae. Gonostylus 75–90 µm long. HR 0.94–1.03. HV 5.69–6.06.

Female and immatures: Unknown.

Type material: Holotype male, slide-mounted, BRAZIL, Amazonas, Serrinha, Rio Aracá , 00°24’39”N 63°23’12”W, 29.vii.2009, 69m alt., light trap, PRONEX Program,coll. N. Hamada, A.M.O.Pes, R. L.F. Keppler, C.A.S. Azevedo & C. Monteiro ( INPA) . Paratypes: 1 male, slide-mounted, BRAZIL, Rondônia, Candeias do Jamari, Rio Preto, Ponte de madeira, 08°52’40”S 63°38’02”W, 19–20.vii.2012, light trap, coll. R . Boldrini & A.S. Fernandes ( 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: Tapajos froehlichi sp. n. matches the generic diagnostic characters proposed by Trivinho-Strixino et al. (2013) in all characters except for the inferior volsella slightly expanded, which is distally parallel-sided in the new species. Besides this character, description of the genus should be emended as follows: AR 1.3–2.5; temporal setae uni- to biserial; scutellum with or without setae; squama bare to setose.

Distribution: The species occurs in Amazon forest from Amazonas and Rondônia state, northern Brazil ( Fig. 3 ).

Figures

Figure 2 Tapajos froehlichi sp. n., male. (A) Wing; (B) Thorax, lateral view; (C) Hypopygium, dorsal view; (D) 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.