Pseudochironomus mocidade, Trivinho-Strixino, 2017

Trivinho-Strixino, Susana, 2017, Brazilian Pseudochironomini (Diptera: Chironomidae) Part 1. New Pseudochironomus Malloch from highlands, Zootaxa 4317 (1), pp. 134-154 : 148-149

Pseudochironomus mocidade sp. n. Shimabukuro & Trivinho-Strixino

Type material. Holotype male, BRAZIL, Roraima State, Serra da Mocidade, 01°42”.225’S, 61°47”.079´W, light trap cloSe to the Stream , 996 m a.S.l., 27.i.2016. J.M.C. NaScimento (I1 – 33, LEIA-UFSCar). Paratype: one male, Same data aS holotype, except for 29.i.2016 (I1 – 34, LEIA-UFSCar), and one male, Same data aS holotype, except for 02.ii.2016 (I1 – 35, LEIA-UFSCar)

Etymology. Named after the type-locality Serra da Mocidade in Roraima State. The name iS treated aS a noun in appoSition.

Diagnostic characters. Adult male: total length 2.6–3.8 mm; wing length 2.0– 2.6 mm; preSence of acroStichalS; TIX with protruding end projecting from the tergite, terminal notch preSent; gonoStyluS Short and broad; median VolSella thin with one apical Seta and another Seta right aboVe; Superior VolSella bare, preSenting two long Setae; parS VentraliS completely diVided.

Male (n =3)

Total length 2.6–3.8 mm. Wing 2.0– 2.6 mm long and 0.61–0.89 mm wide. Total length/wing length 1.32–1.48. Wing length/length of profemur 1.98–2.18.

Colouration: General colouration brown. Thorax with dark brown marking ( Fig. 1 c). TergiteS brown with pale SpotS in the inSertion of Setae. Femur yellow, tibia and tarSi brown.

Head. AR= 3.46 (1). Antenna 1031 µm long. 13 flagellomereS. LaSt flagellomere 800 µm long; 34–37 temporal Setae. ClypeuS with 23–31 Setae. Palpomere 2–5 lengthS (µm) 75–113; 175–213; 200–262; 306–319. Third palpomere with a Slight fingerlike proceSS.

Thorax ( Fig. 1 c). AcroStichalS 3–6, uniSerial ( Fig. 1 c); antepronotalS, in lateral poSition 6–11, Small; dorSocentralS 11–13 in a Single row, ariSing from pale areaS; prealarS 3–5; Scutellum with 19–26 Setae, double row.

Wing. VR 1.05–1.16. Brachiolum with 2 Setae. R with 19–25 Setae. R1 with 6–11. R4+5 0–14, proximally abSent. Squama with 23–27 (2) Setae.

Legs. Spur of fore tibia 31–58 long; SpurS of mid tibia 55–72 and 65–75 µm long; SpurS of hind tibia 66–81 and 71–85 long. Length of legS and LR proportion aS in Table 5.

Hypopygium ( Fig. 9 a). PoSterior margin of tergite IX with median notch ( Fig. 9 c) with 8–9 (2) Setae and projecting from the tergite. LateroSternite IX with 4–13 Setae. Phallapodeme 67–99 µm long. TranSVerSe Sternapodeme 92–134 µm long. Superior VolSella ( Fig. 9 b) 68–94 µm long curVed, apically concaVe ending aS two pointS, with one point 15 µm and the other with 8 µm long, whithout microtrichia, but with two long Setae: Superior Seta with 29 µm and the inferior with 25 µm. Inferior VolSella foot Shaped, 78–92 µm long, with microtrichia and long Setae, longeSt apical Setae 25–30 µm long. Median VolSella 12–18 µm long, thin, and bearing one apical Seta 38–40 µm, and one Seta 23–25 µm long aboVe median VolSella. Gonocoxite 105–148 µm long. GonoStyluS Short and broad 55–85 µm. HR = 1.7–1.9. ParS VentraliS completely diVided ( Fig. 9 d) into two, 66–74 µm long and 12– 15 µm wide lobeS.

Remarks. The Small body Size and the preSence of an additional Setae on Superior VolSella differS P. mocidade sp. n. from the cloSe related SpecieS: P. ruah sp. n. and P. jordensis sp. n.. In addition, different from P. ruah sp. n. and P. jordensis sp. n., P. mocidade sp. n. preSentS the terminal region of TIX protruding.

Ecological notes. The three adult maleS were collected uSing light trapS Setting up near StreamS in a Amazonian mountainouS region at approximately 1000 m a.S.l., in a Site characterized by a denSe canopy coVer. Temperature from the Stream water waS 19.5°C, pH: 5.39–6.75 and conductiVity 12 µS.cm -1.

Figures

FIGURE 1. Thorax and detail of the acrostichals and setal scars on scutum, lateral vieW. a. Pseudochironomus ruah sp. n.. b. Pseudochironomus jordensis sp. n.. c. Pseudochironomus mocidade sp. n.. d. Pseudochironomus surianae sp. n..

FIGURE 9. Pseudochironomus mocidade sp. n. adult male. a. hypopygium, left dorsal right ventral vieW. b. superior volsella. c. posterior margin of tergite IX. d. pars ventralis.