Hydrellia bocaiuvensis, Júnior, Francisco De Assis Rodrigues, Mathis, Wayne Nielsen & Couri, Márcia Souto, 2014

Júnior, Francisco De Assis Rodrigues, Mathis, Wayne Nielsen & Couri, Márcia Souto, 2014, Hydrellia Robineau-Desvoidy (Diptera: Ephydridae) from Brazil with an emphasis on the faunas from the states of Parana and Rio de Janeiro, Zootaxa 3753 (6), pp. 501-541 : 524-527

Hydrellia bocaiuvensis sp. nov.

(Figs.: 2, 18.1–18.7, 19.1–19.3 and 20.1)

Diagnosis. Body length of male 1.86–1.92 mm, female 1.96–2.30 mm; frons broader than high; densely microtomentose, velvety black; both proclinate and reclinate fronto-orbital setae present; first flagellomere dark brown dorsoapically, orange yellow ventrobasally; 6–8 aristal rays; maxillary palpus yellow (fig. 20.1); mesonotum dark brown, densely microtomentose over black, subshiny; scutellum velvety black, except for marginal lateral and apical area; well-developed dorsocentral setae 0+1; 3 scutellar setae; pleurae mostly brownish dorsally until notopleuron, and grayish from anepisternum to katepisternum; posterior margin of notopleuron and adjacent area of supra-alar densely microtomentose, velvety black (fig. 20.1); tarsi mostly orange yellow, except for dark brown apical tarsomeres 4 and 5; sternite 5 deeply concave and congruent with distiphallus; surstylus broader than high, concave anteriorly (figs. 18.1 and 18.7).

Description. Head: frons broader than high; densely microtomentose, velvety black; ocellar triangle grayish brown microtomentose, subshiny; both proclinate and reclinate fronto-orbital setae present, with a third smaller setula between them; ocellar setae absent; scape dark brown; pedicel black, grayish microtomentose anteriorly; pedicel with 1 small dorsal seta; pedicel with 2–3 ventral hair like setulae; first flagellomere dark brown dorsoapically, orange yellow ventrobasally; 6–8 aristal rays; lunule silver to golden silver; face silver, sparsely golden microtomentose medially, in lateral view nearly vertical, but with antennal grooves distinct; facial setae 4– 6, usually with 1–2 minute shallowly declinate dorsal secondary facial setulae; parafacial narrow, usually concolorous with genal groove; genal groove black; 1 genal seta; gena, postgena and occiput grayish brown microtomentose; maxillary palpus yellow (fig. 20.1), spatulate, with 3 setulae; epistomal ratio: 1.31–1.43; mesofacial ratio: 1.91–2.05; vertex ratio: 8.56–9.65; eye-to-gena ratio: 4.98–5.47; head ratio: 1.32–1.35.

Thorax: mesonotum dark brown over black, densely microtomentose, subshiny; scutellum velvety black, except for marginal lateral and apical area; well-developed dorsocentral setae 0+1; 1 postpronotal seta; 3 scutellar setae, mid pair weakly developed; thorax in lateral view mostly brownish dorsally, until notopleuron, and grayish from anepisternum to katepisternum; posterior margin of notopleuron and adjacent area of supra-alar densely microtomentose, velvety black (fig. 20.1); 1 anepisternal seta well developed; 1 mesokatepisternal seta. Wings: length 2.08–2.35 mm; hyaline with pale brown venation; knob of halter fluorescent yellow to pale yellow, stem orange; costal sections indices: II/I: 2.39–2.59; III/IV: 3.23 –3.71; V/IV: 3.32–3.72; vein M ratio: 3.67–4.03. Legs: coxae and femora concolorous with pleural areas; joints orange yellow; fore tibiae orange yellow; mid and hind tibiae grayish brown microtomentose medially; ctenidial setae along anteroventral margin of forefemur minute; tarsi mostly orange yellow, except for dark brown apical tarsomeres 4 and 5.

Abdomen: grayish brown over black, densely microtomentose, subshiny. Male terminalia: sternite 5 deeply concave and congruent with distiphallus (figs. 18.1 and 18.2); surstylus broader than high, concave anteriorly (figs. 18.1 and 18.7); postgonite bent anteromedially (figs. 18.1 and 18.2); pregonite comparatively narrow, bifurcated, each lobe bearing 1 setula (figs. 18.1 and 18.2); postsurstylus broad (figs. 18.1 and 18.2); aedeagus in ventral view fusiform (fig. 18.3); phallapodeme in ventral view narrow (fig. 18.5), bifurcated in both sides; epandrium narrow (fig. 18.1). Female terminalia: tergite 7 twice smaller than tergite 6 (fig. 19.2); tergites 7–8 mostly retracted within tergite 6 (fig. 19.2); cercus in lateral view rounded; sternites subequal, roundly quadrate (fig. 19.1); tergite 8 in lateral view rounded medially, uniformly microsetulose (fig. 19.1); ventral receptacle with a cap cupuliform, about 1.5 higher than broad (fig. 19.3).

Material examined. Holotype male ( MNRJ): “ Brazil, Paraná, Bocaiúva do Sul (25°14.9'S, 49°8.9'W; 890 m), 2–4.Nov.2010, D. and W. N. Mathis”. Paratypes: labelled the same as holotype (22 male, 27 female; MNRJ, USNM).

Distribution. Neotropical: Brazil (Paraná)

Etymology. The specific epithet, bocaiuvensis , refers to the type-locality Bocaiúva do Sul, Paraná, Brazil.

Notes. Hydrellia bocaiuvensis sp. nov. is morphologically very similar to H. xanthocera . Both species belong to the formosa species group. They can be distinguished by the ground color, number of scutellar setae and shape of the phallapodeme.