Brazilian Pseudochironomini (Diptera: Chironomidae) Part 2. New Pseudochironomus and Riethia species Author Trivinho-Strixino, Susana Author Shimabukuro, Erika Mayumi text Zootaxa 2018 2018-04-04 4403 2 245 260 journal article 30347 10.11646/zootaxa.4403.2.2 8928f1a2-2ef1-4127-9ebc-3a3704d90650 1175-5326 1212143 7BC0BA48-45E8-4122-817F-8CC4D759AAF1 Pseudochironomus boraceia sp. n. ( Fig. 6 ) Type material . Holotype : Male, slide mounted in Euparal, Brazil , São Paulo , Salesópolis, 18.ix.2007 , light trap, leg. Fröehlich, C. G. ( I1-06 , LEIA-UFSCar). Paratypes : 2 males , as holotype , 12.x.2001 ( I1-07 , I1-08, LEIA- UFSCar). Derivatio nominis . The name boraceia refers to the type locality, Boracéia Park. The name is treated as a noun in apposition. Diagnostic characters . Adult male of Pseudochironomus boraceia sp. n. differs from all other species of the genus by the combination of the following characters. Adult male: acrosticals present on thorax; hypopygium with a protruding end and without anal point; hooklike superior volsella, with three simple setae and the internal projection sclerotized; median volsella short semi triangulate with one or two large setae; pars ventralis divided only at the apex; inferior volsella enlarged distally with microtrichia and several marginal large setae. Description. Male (n =3). Total length 4.47–5.64 mm . Wing length 2.15–2.46 mm . Coloration . Thorax brown with dark brown vitae; abdomen with transversal brown bands on each segment. Legs dark brown. Head . Temporal 20–23 setae. Clypeus with 31 setae. Antenna 1.23–1.50 mm long; AR 1.51–2.01. Palpomere 2–5 lengths: 55–75, 175, 213–225, 288–337 µm. Thorax ( Fig. 6a ). Ac 5–6; Dc 9; Pa 4–5; Scts 18–22. Wings ( Fig. 6b ). Width 0.60–0.77 mm . VR 1.03–1.10. Brachiolum with two setae. Veins setae on R with 17– 19, R1 with 0–1, and R4+5 with 0–1 setae. Squama with 16–22 setae. Legs . Scale on fore tibia 58–72 µm long, with a spine at the apex. Tibial combs of mid and hind legs partially fused; mid tibial spur anterior, 58 µm, posterior 78 µm long; hind tibial spur anterior, 66 µm, posterior 88 µm long. Lengths and proportions of the legs as in Table II. FIGURE 5. Pseudochironomus ariquemis sp. n. larva. (a) Antenna. (b) Dorsal sclerites of head. (c) Labral lamella and SI. (d) Premandible. (e) Mandible. (f) Mentum and ventromental plate. TABLE II. Lengths (in µm) and proportions of legs of Pseudochironomus boraceia sp. n. male (3).

fe	ti	ta1	ta2
PI	877–1015	1107–1446	1000–1307	461–615
PII	1092–1215	100–1184	584–630	231–307
PIII	1046–1230	1200–1446	723–846	393–461

ta3	ta4	ta5	LR
PI	446–461	354–385	185–215	0.84–0.90
PII	200–231	123–154	92–107	0.53–0.58
PIII	292–323	153–215	107	0.56-0.60

FIGURE 6. Pseudochironomus boraceia sp. n. male. (a) Thorax. (b) Wing. (c) Hypopygium. (d) Hypopygium, right ventral view, left dorsal view. (e). Superior and inferior volsellae. Hypopygium ( Fig. 6c, d ). Tergite IX without anal point. Laterosternite with ten setae. Transverse sternapodeme 77–97 µm long (2), with developed oral projections. Phallapodeme 83–110 µm long (2). Pars ventralis narrow, 57 µm long, partially divided at the apex. Gonocoxite 118–128 µm long. Superior volsella hooklike ( Fig. 6e ), with three preapical simple setae and internal projection sclerotized. Median volsella semitriangular with 1–2 simple setae near apex. Inferior volsella pubescent with several marginal large and ventral setae ( Fig. 6e ). Gonostylus 146–158 µm long. HR 1.00–1.22.