Riethia pantera, Trivinho-Strixino & Shimabukuro, 2018

Trivinho-Strixino, Susana & Shimabukuro, Erika Mayumi, 2018, Brazilian Pseudochironomini (Diptera: Chironomidae) Part 2. New Pseudochironomus and Riethia species, Zootaxa 4403 (2), pp. 245-260 : 254-255

Riethia pantera sp. n.

( Fig. 8 )

Type material. Holotype: Male , slide mounted in Euparal , Brazil, AM, Presidente Figueiredo , Estrada de Balbina, Recanto da Pantera, 0 2 0 00’41”S, 60 0 01’32”W, 22.iii.2008, leg. Dantas, G.P.S. (I1-10, LEIA-UFSCar) . Paratypes: 2 males, Brazil, AM, Manaus, RF Ducke, Igarapé Ipiranga, 05.iv.2017, leg. Dantas GPS (( I1-12 ND 13, LEIA- UFSCar).

Derivatio nominis. Refers to the name of the type-locality: Recanto da Pantera. The specific epithet is treated as a noun in apposition.

Diagnostic characters. Riethia pantera sp. n. differs from other species of the genus by the combination of the following characters. Male: hypopygium with superior volsella hooklike, basally pubescent and with two large setae; distal internal margin with four long simple setae. Median volsella present. Inferior volsella with seven internal marginal large scales and numerous dorsal apically pectinate and non-pectinate setae. Transverse sternapodeme with oral projections.

Description. Male (n = 1) Total length near 5.30 mm. Wing length 2.40–2.46 mm.

Colouration. Thorax and abdomen brown. Legs light brown.

Head. Temporal with 20–21 setae. Eye with broad dorsomedial extension. Clypeus with 25–31 setae. Antenna 1.57 mm long; AR 1.97 (1). Palpomere 2–5 (1) lengths: 62, 181, 169, 238 µm.

Thorax ( Fig. 8a ). 1.46 mm long. Ac presents; Dc 10–11; Pa 4; Supra 1; Scts 11–14.

Wings ( Fig. 8b ). Width 0.65 mm. VR 1.14–1.20. Brachiolum with two setae. Veins setae on R with 19, R1 with 16, and R4+5 with 18 setae. Squama with 14–20 setae.

Legs. Spur of fore tibia 75 µm. Tibial combs of mid and hind legs partially fused; mid tibial spur anterior, 87– 89 µm, posterior 94–103 µm long; hind tibial spur anterior, 89–106 µm, posterior 118–119 µm long. Lengths and proportions of legs as in Table IV.

TABLE IV. Lengths (in µm) and proportions of legs of Riethia pantera sp. n. male (2).

Hypopygium ( Fig. 8c, d ). Anal point absent. Laterosternite with two setae. Transverse sternapodeme 105 µm long, with weak oral projections. Phallapodeme 91 µm long. Gonocoxite 138 µm long. Superior volsella hooklike basally pubescent, with four preapical simple setae and two basal larger setae ( Fig. 8e ). Median volsella short with two simple setae. Inferior volsella pubescent with seven marginal broad scales ( Fig. 8f ) and numerous simple and apically pectinate dorsal setae ( Fig. 8g ). Gonostylus 203 µm long. HR 0.68.

Figures

FIGURE 8. Riethia pantera sp. n. male. (a) Thorax. (b) Wing. (c) Hypopygium. (d) Hypopygium, right ventral view, left dorsal view.(e) Superior volsella.(f) Ventral view of inferior volsella (g) Dorsal view of inferior volsella.