Notiocoenia pollinosa Mathis

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 : 21-23

4. Notiocoenia pollinosa Mathis

Figs. 21–26 , Map 4

Notiocoenia pollinosa Mathis 1980: 18 .—Lizarralde de Grosso 1989: 59 –60 [list, Argentina].— Mathis and Zatwarnicki 1995: 250 [world catalog].

Diagnosis. Because this is the only known species of the pollinosa group, the diagnosis of the latter, as cited previously, will adequately serve to distinguish specimens of this species. Should additional species of this speciesgroup be discovered, character states of the male terminalia will undoubtedly distinguish them from the present species. Small to moderately small shore flies, body length 1.98–2.56 mm; generally shiny, dark brown dorsally.

Head ( Figs. 21–22 ): Frons width-to-length ratio 0.36–0.38; coloration of frons mostly pale brown with some faintly olivaceous to greenish tinges. Antenna unicolorous, black. Coloration of face unicolorous, whitish gray to silvery gray; antennal groove shallowly impressed. Eye height-to-width ratio 0.86–0.88; gena-to-eye ratio 0.11– 0.13; gena pale brown; well-developed genal seta 1.

Thorax ( Fig. 23 ): Mesonotum and scutellum concolorous, shiny, bronzish brown, except extreme anterior margin of mesonotum dull, grayish. Pleural areas gradually becoming paler brown ventrally, grayer, particularly forecoxa and katepisternum. Wing palely infuscate, pale brown, appearing dull; with 2 white spots on either side of crossvein dm-cu; costal vein ratio 0.14–0.16; M vein ratio 0.58–0.61. Legs unicolorous, black; fore- and hindfemora appearing swollen. Halter brownish yellow, unicolorous.

Abdomen: Subshiny anteriorly, becoming distinctly shiny posteriorly; coloration grayish black anteriorly, becoming very dark greenish black posteriorly; female tergites becoming progressively longer posteriorly, also narrowing with gradual taper toward posterior end; male tergite 4 subequal to combined length of tergites 2 and 3; male tergite 5 subtrapezoidal, bluntly rounded apically, length about equal to length of tergite 4; male tergite 4 produced ventrally to acutely pointed apex; male sternite 4 subquadrate, becoming densely setose medioposteriorly. Male terminalia ( Figs. 24–26 ): Epandrium generally setulose, in posterior view ( Fig. 24 ) with dorsal 2/3 as an inverted U, more thinly developed dorsally, in lateral view ( Fig. 25 ) dorsal arch of inverted U more thinly developed, thereafter ventrally in lateral view gradually becoming wider to level of ventral margin of cercal cavity, ventral 1/ 3 in posterior view ( Fig. 24 ) flared laterally as bluntly rounded, lateral projections, posterior and anterior margins nearly parallel, posterior margin straight; ventral epandrial margin, which is probably the fused surstylus, obtusely angulate with a V-shaped medial notch and partial medial suture; cerci free in cercal cavity, not fused with epandrium, semihemispherical, short, subequal to ¼ length of epandrium and fused surstyli; aedeagus in lateral view ( Fig. 26 ) elongate, conspicuously wider on basal half, apical portion narrowed, slender, pointed apically; gonite produced anteroventrally as curved parallel-sided slender process.

Type material. The holotype male is labeled “ CHILE: Prov. Magallanes Rio Verde 12 Jan. 1966 Flint & Cekalovic/ HOLOTYPE Notiocoenia pollinosa Mathis [handwritten, red].” The holotype specimen is double mounted (glued to a paper point), is in good condition (although both basal flagellomeres are missing), and is deposited in the USNM (76069). The allotype female and four paratypes (2♂, 2♀; USNM) are labeled “ CHILE Chanillo Esperanza 25-II-1962 T. Cekalovic.” Other paratypes as follows: ARGENTINA: Rio Negro: Llao Llao (11.4 km E; 41°03'S, 71°32'W; 760 m), 16 Nov 1966, M. E. Irwin and E. I. Schlinger (2♂, 3♀; CAS); Puerto Moreno (3.7 km S; 41°07'S, 71°25'W; 800 m), 17 Nov 1966, M. E. Irwin, E. I. Schlinger (1♀; CAS); San Carlos de Bariloche (49°09'S, 71°18'W), Nov 1926, R. C. and E. Shannon (1♀; USNM). Santa Cruz: Lago Argentino (49°45'S, 72°W), 26 Feb 1953, A. Willink (1♂, 1♀; FML).

Type locality. Chile. Magallanes : Río Verde (43°23.8'S, 72°31.5'W).

Other specimens examined. CHILE. Aisen: Chile Chico (4.8 km W; 46°33'S, 71°44'W; 400 m; meadow), 22 Nov 1966, M. E. Irvin, E. I. Schlinger (1♂, 1♀; CAS). Magallanes : Río Verde (43°23.8'S, 72°31.5'W), 12 Jan 1966, O. S. Flint, Jr., T. Cekalovic (1♂, 2ex; USNM); Río Tres Brazos (53°16'S, 70°56'W), 9–13 Jan 1966, O. S. Flint, Jr., T. Cekalovic (4♀; USNM); Punta Arenas (53°09'S, 70°55'W), 9–15 Jan 1966, O. S. Flint, Jr., T. Cekalovic, 22 Feb 1962, T. Cekalovic (3♀; USNM); Laguna Amarga (4 km W; 5059'S, 72°45'W), 7 Dec 1966, M. E. Irwin, E. I. Schlinger (4♂, 4♀; CAS); Laguna Amarga (4 km W; 51°S, 72°48'W; 300 m), 7 Dec 1966, M. E. Irwin, E. I. Schlinger (3♂; CAS); Laguna Azul (50°52'S, 72°42'W), 1 Feb 1952, (2♂, 1♀; FML); Cerro Mina Rica (53°07'S, 71°07'W), 13 Jan 1952 (1♀; FML); Dos Lagunas (48°52'S, 72°52'W), 27 Jan 1957, T. Cekalovic (1♂; USNM).

Distribution (Map 4). Neotropical: Argentina (Rio Negro, Santa Cruz), Chile (Aisen, Magallanes ), between 41°–55°S.

MAP 4. Distribution map for Notiocoenia pollinosa Mathis.

Figures

FIGURES 21 – 23. Notiocoenia pollinosa Mathis. (21) head, anterior view; (22) same, lateral view; (23) mesonotum, dorsal view (from Mathis 1980).

FIGURES 24 – 26. Structures of male terminalia of Notiocoenia pollinosa Mathis. (24) epandrium and cerci, posterior view; (25) same, lateral view; (26) internal structures of male terminalia, lateral view (from Mathis 1980).