Hydrellia longiseta, 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 : 527-529

Hydrellia longiseta sp. nov.

(Figs.: 17, 20.2, 21.1–21.7 and 22.1–22.3)

Diagnosis. Large species (fig. 20.2), body length of male 2.56 mm, female 2.80–3.38 mm; frons as broad as high; ocellar setae subequal to pseudopostocellar setae; both proclinate and reclinate fronto-orbital setae present; frons silvery gray, sparsely golden microtomentose; scape and pedicel silvery gray; pedicel with 1 dorsal setae; first flagellomere orange yellow ventrobasally, dark brown to black dorsoapically; 5–7 aristal rays; face golden microtomentose over silver, in lateral view nearly vertical but with distinct antennal groove; maxillary palpus orange yellow; mesonotum silvery gray, sparsely golden brown microtomentose; dorsocentral setae 1+1, far removed from suture; tarsi mostly dark yellow to brown, becoming grayish black from tarsomere 3; mid and hind tibiae with tibiotarsal ctenidium weakly developed; sternite 5 truncate anteriorly, with a deep posteromedial sulcus (figs. 21.1 and 21.2); basiphallus in ventral view rounded, distiphallus small (fig. 21.3); phallapodeme in ventral view bifurcated at the attachment with hypandrium, narrow medially, becoming broad next to the attachment with the postsurstylus, posterior margin truncated (figs. 21.5); in lateral view boot-shaped (fig. 21.6); surstylus broadly and deeply concave anteromedially (figs. 21.1 and 21.7).

Description. Head: as broad as high; frons as broad as high; ocellar setae subequal to pseudopostocellar setae; both proclinate and reclinate fronto orbital setae present, with a third smaller setula between them; frons silvery gray, sparsely golden microtomentose; scape and pedicel silvery gray; pedicel with 1 dorsal seta and 2 ventral welldeveloped hair-like setulae; first flagellomere orange yellow ventrobasally, dark brown to black dorsoapically; 5–7 aristal rays; face golden microtomentose over silver, in lateral view nearly vertical but with distinct antennal groove; 4 primary facial setae, with 1 slightly declinate dorsal secondary facial setulae; lunule concolorous with face; parafacial broad, mostly silver; genal groove black; gena, postgena and occiput silvery gray; 1 welldeveloped genal seta; 1 well-developed postgenal setula; maxillary palpus orange yellow, spatulate, bearing 4 setulae; epistomal ratio: 1.20–1.33; mesofacial ratio: 1.80–2.09; vertex ratio: 3.78–4.15; eye-to-gena ratio: 4.43– 5.23; head ratio: 1.30–1.30.

Thorax: mesonotum silvery gray, sparsely golden brown microtomentose; dorsocentral setae 1+1, far removed from suture; 3 scutellar setae, mid pair weakly developed; 1 postpronotal seta; 1 mesokatepisternal seta; pleural areas below notopleuron silvery gray; anepisternum sparsely golden brown microtomentose posteriorly. Wings: length 2.34–3.15 mm; hyaline with pale yellow venation; knob of halter yellow, stem orange yellow; costal sections indices: II/I: 2.65–2.75; III/IV: 2.79–2.82; V/IV: 3.92–4.00; vein M ratio: 3.26–3.40. Legs: mostly silvery gray; joints dark yellow to brown; ctenidial setae along anteroventral margin of forefemur weakly developed; tarsi mostly dark yellow to brown, becoming grayish black from tarsomere 3; mid and hind tibiae with tibiotarsal ctenidium weakly developed.

Abdomen: opaque to subshiny; grayish brown dorsally; silvery gray in lateral and ventral views; anterodorsal corner of syntergite 1+2 to tergite 5 greenish brown when in lateral view. Male terminalia: sternite 5 truncate anteriorly, with a deep posteromedial sulcus (figs. 21.1 and 21.2); postgonite bent anteromedially (figs. 21.1 and 21.2); pregonite broad, bifurcated, each arm with a setula (figs. 21.1 and 21.2); basiphallus in ventral view rounded, distiphallus small (fig. 21.3); phallapodeme in ventral view bifurcated at the attachment with hypandrium, narrow medially, becoming broad next to the attachment with the postsurstylus, posterior margin truncated (fig. 21.5); in lateral view boot-shaped (fig. 21.6); surstylus broadly and deeply concave anteromedially (figs. 21.1 and 21.7); epandrium narrow (fig. 21.1). Female terminalia: tergites 3–5 subequal; tergite 6 two to three times larger than seventh (fig. 22.2); tergite 7 slightly larger than tergite 8 (fig. 22.2); sternites 3–5 roundly rectangular, subequal, twice larger than wide; sternite 6 roundly quadrate (fig. 22.1); sternite 7 trapezoidal, bent dorsally, uniformly setulose on posterior margin, with 3 well-developed, hair-like setulae on posterior corners (fig. 22.1); tergite 8 truncate on anterior margin, posterior margin convex, rounded, uniformly microsetulose, with 1 well-developed hair like setula on posterior corner (fig. 22.1); hypoproct much wider than large, isosceles, with posterior obtuse vertex (fig. 22.1); cerci ovoid reniform in lateral view; ventral receptacle with a cap cupuliform, 2–2.5 times larger than broad, extended process J-shaped (fig. 22.3).

Material examined. Holotype male ( MNRJ): “ Brazil, Paraná, Parque Iguaçú (25°33.4'S, 49°13.6'W; 880 m), 22.Jan.2010, D. and W. N. Mathis”. Paratypes: Brazil: Labelled the same as holotype (1 male, 1 female; MNRJ). Espírito Santo. Baixo Guandu (19°30.9'S, 41°0.7'W), IX.1970, P. C. Elias (2 male, 8 female; MZUSP). Paraná. Castro (Parque Lacustre; 24°47.4'S, 50°0.3'W; 990 m), 24–25.XII.2009, D. and W. N. Mathis (1 female; USNM).

Distribution. Neotropical: Brazil (Espírito Santo and Paraná).

Etymology. The specific epithet, longiseta , refers to the well-developed ocellar setae, remarkable in this species.

Notes. Hydrellia longiseta sp. nov. can be easily distinguished by its large size, its well-developed ocellar seta and the proportions of the frons.