Hydrellia calverti Cresson 1918

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 : 508-511

Hydrellia calverti Cresson 1918

(Figs.: 4.2, 5.1–5.7, 6.1–6.4 and 7)

Hydrellia calverti Cresson 1918: 48 (description of male and female). Holotype male, ANSP 6120. Type-locality: Costa Rica, Alajuela, Bonnefil Farm, Rio Surubres (09°56'N, 84°35'W; 800 ft); Cresson 1947: 39 (key, Neotropical species); Wirth 1968: 13 (Neotropical catalog); Mathis & Zatwarnicki (1995): 66 –67 (world catalog).

Diagnosis. Body length of male 2.01–2.30 mm, female 2.47–2.58 mm; all fronto-orbital setae proclinate; pedicel usually with 1 well-developed dorsal seta; mesonotum dark grayish brown with metallic blue reflections over black; pleurae opaque brown dorsally until 0.2–0.4 superior margin of anepisternum contrasting with other pleural bluish gray areas (fig. 4.2); well-developed dorsocentral setae 1+1; mid and hind basitarsomeres dark grayish brown to black; abdomen greenish brown with metallic green reflections dorsally and laterally (fig. 4.2); sternite 5 truncate in anterior margin, deeply concave posteromedially, posterior arms broad, setose mainly in inner margin (figs 5.1 and 5.2); basiphallus broad, with lateral broad projections bent medially and congruent with distiphallus (fig. 5.3); surstylus longer than wide, ventral margin bilobed, medial emargination broad and moderately shallow (figs. 5.1 and 5.7).

Description. Head: frons broader than high; dark grayish brown; fronto-orbital plate usually darker; ocellar setae present, twice shorter than pseudopostocellar seta; 2 fronto-orbital setae with a third smaller setula between them, all proclinate, posterior setae twice smaller than anterior; antennae dark grayish brown; pedicel with 1 welldeveloped seta on dorsal margin and 2 well-developed hair like setulae on ventral margin; 6–8 aristal rays; face narrow; facial microtomentum silver or golden; face in lateral view nearly vertical to distinctly convex, very rounded, medial elevation to a distinct carina on dorsal portion, antennal grooves usually distinct; primary facial setae 5–6; shallowly declinate secondary facial setulae 5–8; lunule silver, sometimes golden microtomentose; parafacial narrow, concolorous with face; maxillary palpus dark grayish brown to black; 1 genal seta, sometimes with 1 well-developed postgenal setula; gena, postgena and occiput silvery gray; genal groove black; epistomal ratio: 1.83–1.88; mesofacial ratio: 2.57–2.72; vertex ratio: 6.40–6.88; eye-to-gena ratio: 4.92–6.11; head ratio: 1.26–1.30.

Thorax: mesonotum dark grayish brown with metallic blue reflections over black; well-developed dorsocentral setae 1+1, presutural pair usually slightly smaller, sometimes reduced to half-length of postsutural; 3 scutellar setae, mid pair weakly developed; 1 postpronotal seta; 1 mesokatepisternal seta; pleurae opaque brown dorsally until 0.2–0.4 superior margin of anepisternum, contrasting with other bluish gray pleural areas (fig. 4.2). Wings: length 2.08–2.57 mm; hyaline with brown venation; knob of halter fluorescent yellow to whitish yellow, stem brownish; costal sections indices: II/I: 2.02–2.12; III/IV: 3.16–3.61; V/IV: 3.29–3.79; vein M ratio: 3.21–3.27. Legs: gray microtomentose over dark brown; femoro-tibial joint brown, fore femur with weakly developed ctenidial setae along anteroventral margin; tarsi dark grayish brown to black; trochanter brown.

Abdomen: greenish brown with metallic green reflections dorsally and laterally (fig. 4.2); bluish gray ventrally. Male terminalia: sternite 5 truncate in anterior margin, deeply concave posteromedially, posterior arms broad, setose mainly in inner margin (figs. 5.1 and 5.2); postsurstylus with an inner membrane from base to apices (fig.

5.2); postgonite bent anteromedially (figs. 5.1 and 5.2); pregonite straight, slightly curved medially, bifurcated (figs. 5.1 and 5.2); basiphallus broad, with lateral broad projections bent medially and congruent with distiphallus (fig. 5.3); distiphallus small; phallapodeme bifurcated only in apical margin, with a membrane between the two lobes, posterior margin truncate (fig. 5.5); surstylus longer than wide, ventral margin bilobed, medial emargination broad and moderately shallow, with small lateral projections in the attachment with postsurstylus (figs. 5.1 and 5.7); epandrium narrow (fig. 5.1). Female terminalia: tergite 6 twice longer than seventh (fig. 6.1); tergites 7–8 mostly retracted within sixth (fig. 6.2); sternite 6 longer than wide, seventh and tergite 8s subequal, roundly quadrate (fig. 6.1); tergite 8 in ventral view shallowly concave on posterior margin, bearing 1–2 long hair like setulae, in lateral view slightly rounded (fig. 6.1); ventral receptacle with a cap cupuliform (fig. 6.3).

Egg (fig. 6.4): fusiform; chorion corrugate, with perpendicular striae; micropylar end acute.

Material examined. Brazil: Paraná, Parque Iguaçú (25°33.4'S, 49°13.6'W; 880 m), 12.IV–12.XI.2010, D. and W. N. Mathis (5 male, 3 female; MNRJ, USNM). Paraná, Matinhos (R. da Onça; 25° 47.4'S, 48° 31.6'W; 3 m), 12.XI.2010, D. and W. N. Mathis (1 female; USNM).

Distribution. Neotropical: Brazil (Amazonas and Paraná), Costa Rica, Ecuador, Panamá, Trinidad and West Indies (Antilles, Dominica, Dominican Republic and Puerto Rico).

Notes. Hydrellia calverti is recorded for the first time from Brazil, and the male and female terminalia are also illustrated for the first time. The first photography of this species is presented. This species is morphologically similar to H. agitator Deonier and H. tibialis Cresson , but can be easily distinguished by the orientation of the fronto-orbital setae and the coloration of the pleura and notum.