Neoephydra trichina, Mathis, Wayne N. & Marinoni, Luciane, 2016

Mathis, Wayne N. & Marinoni, Luciane, 2016, Revision of Ephydrini Zetterstedt (Diptera: Ephydridae) from the Americas south of the United States, Zootaxa 4116 (1), pp. 1-110 : 70-72

22. Neoephydra trichina sp. nov.

Figs. 95–99 , Map 22

Diagnosis. Specimens of N. trichina are distinguished from similar congeners of the araucaria group by the following characters: appearance generally dark; legs bicolored; face densely setose; gena high; and structures of male terminalia with distinctive conformation. Medium-sized to large shore flies, body length 3.50–5.30 mm; generally dull, grayish brown to gray with some subshiny areas dorsally.

Head ( Fig. 95 ): Head ratio 0.65–69; frontal ratio 0.50–56; mesofrons with dark, blackish blue, metallic luster, generally pilose; ocellar triangle and parafrons nearly concolorous, microtomentose, brown; parafrons more charcoal colored anteriorly; fronto-orbits with narrow strip through insertions of fronto-orbital setae slightly subshiny, with some metallic luster, concolorous with mesofrons; fronto-orbital setae 2. Antenna mostly concolorous, blackish brown. Facial ratio 0.94–0.98; mostly densely setulose particularly along oral margin and toward posteroventral portions of face; dorsum of interfoveal hump with subshiny area more or less concolorous with mesofrons, otherwise face densely microtomentose, grayish tan, gradually paler ventrally. Eye ratio 1.0; genato-eye ratio 0.47–0.52; gena high, whitish gray, olivaceous tan posteriorly.

Thorax ( Fig. 96 ): Mesonotum subshiny, mostly brown to bluish brown, darker and subshinier posteriorly, some specimens with 2 stripes anteriorly, gray to bluish gray; pleural areas paler, more gray colored ventrally; anepisternum olivaceous brown or with anterior and posterior margins brownish; other pleural areas including coxae mostly olivaceous gray. Wing length averaging 4.10 mm; mostly infuscate, brown; costal vein ratio 0.22– 0.24; M vein ratio 0.81–0.86. Legs bicolored; mid- and hindfemora bluish to greenish gray, microtomentose, only slightly darker than ventral pleural areas; tibiae and tarsi generally concolorous, mostly reddish orange with some sparse blackish coloration.

Abdomen: Generally subshiny, thinly microtomentose; anterior margin of tergites 1–4 slightly fasciate, shinier, more bluish anteriorly, more microtomentose, grayer posteriorly, some specimens with faint bluish tinges of metallic luster; ventral surface of tergites frequently whitish gray. Tergite 5 of male somewhat trapezoidal, truncate apically, brassy. Male terminalia ( Figs. 97–99 ): margins of epandrium in posterior view parallel, rounded dorsally; surstyli in posterior view roughly forming equilateral triangle with short apical gap; surstylus in lateral view robustly bifurcate, lateral prong subequal to main surstylar process, lateral prong robust, digitiform, main process tapered to apical point.

MAP 22. Distribution map for Neoephydra trichina sp. nov.

Type material. The holotype male is labeled “ CHILE: Osorno Pr. Laguna El Pato 1100 m. elev. 13 Feb. 1973 W Mathis/ HOLOTYPE Neoephydra trichina Mathis [red, handwritten].” The holotype is double mounted (minute nadel), is in excellent condition, and is deposited in USNM. Allotype female with same label data as the holotype. Other paratypes are as follows: ARGENTINA. Chubut: Arroyo Verde (12 km S Río Senquer; 41°59'S, 65°06'W; 710 m), 20 Nov 1966, M. E. Irwin, E. I. Schlinger (1♂; USNM).

CHILE. Magallanes: Estancia Otway (52°48'S, 71°06'W), 12 Jan 1966, O. S. Flint, Jr., T. Cekalovic (1♂, 5♀; USNM); Laguna Amarga (51°S, 72°48'W), 7 Jul 1966, M. E. Irwin, E. I. Schlinger (15♂, 6♀; USNM); Punta Arenas, Rio de las Minas (53°09'S, 70°55'W), 18 Apr 1971, O. S. Flint, Jr., G. F. Hevel (24♂, 20♀; USNM); Seno Ultima Esperanza-Laguna Azul (50°52'S, 72°42'W), 1 Feb 1952, T. Cekalovic (1♂, 1♀; USNM); South Patagonia, B. Brown (1♂; USNM).

Type locality. Chile. Osorno: Laguna El Pato (41°10'S, 73°40'W; 1100 m).

Distribution (Map 22). Neotropical: Argentina (Chubut) and Chile ( Magallanes ), between 40°–53°S and 65°– 74°W.

Etymology. The specific epithet, trichina , is of Greek derivation and means hair in allusion to the hairiness of the face of this species.

Figures

FIGURES 95 – 96. Head and thorax of Neoephydra trichina sp. nov. (95) head, lateral view; (96) mesonotum, dorsal view.

FIGURES 97 – 99. Structures of male terminalia of Neoephydra trichina sp. nov. (97) epandrium, cerci, surstyli, posterior view; (98) same, lateral view; (99) surstylus, lateral view.