Mimapsilopa iguassu Mathis

Mathis, Wayne N., Costa, Daniel N. R. & Marinoni, Luciane, 2015, A review of Mimapsilopa Cresson (Diptera: Ephydridae) from Brazil, Zootaxa 3926 (4), pp. 499-522 : 505-508

Mimapsilopa iguassu Mathis , Costa & Marinoni n.sp.

Figs. 8–15 , 49 , 52 .

Diagnosis. This species is distinguished from congeners by the following combination of characters: Generally very dark brown, shiny; small to moderately small shore flies, body length 1.40–2.30 mm. Head ( Figs. 8–10 ): Frons microtomentose brown on black background. Basal flagellomere mostly blackish, especially dorsoapically, only basoventromost portion yellowish, gradually tapered to rounded apex; arista with 7–10 dorsal rays. Face mostly shiny bluish black to black, conspicuously microsculptured with shallow, mostly vertical and transverse striae. Eye ratio: 0.59–74; gena-to-eye ratio: 0.11–0.14. Thorax: Mesonotum sparsely microtomentose with brown microtomentum on shiny black background, appearing subshiny; anepisternum mostly shiny, only extreme margins microtomentose. Wing ( Fig. 49 ) mostly infuscate, anterior margin brown, becoming progressively lighter colored posteriorly, posterior margin largely hyaline; length 1.50–2.20 mm; costal ratio 0.57–0.69; M vein ratio 0.73–0.91. Knob of halter white, stem yellowish. Foreleg, including forebasitarsomere and femora, and tibiae of mid- and hindlegs dark brown to black; extreme apex of mid- and hindtibiae and mid- and hindtarsi yellow except for darkened apical tarsomere. Abdomen: Tergites sparsely microtomentose, mostly shiny; tergites 4, 5 about equal in length, both longer than tergite 3; tergite 5 bare, shiny. Male terminalia ( Figs. 11–15 ): Epandrium in posterior view ( Fig. 11 ) setulose with short, moderately stout setulae, shape as an inverted, thick-walled U, widest at dorsolateral corners, conspicuously thinner at dorsal portion above cercal cavity, in lateral view ( Fig. 12 ) height double width, anterior margin sinuous and with sub-basal short projection, posterior margin nearly straight; cercus in posterior view ( Fig. 11 ) elongate, shallowly lunate but not sharply pointed at ventral and dorsal apices, in lateral view ( Fig. 12 ) semi-hemispherical; presurstylus symmetrical, robust, in posterior view ( Fig. 11 ) with one short medial lobe bearing an apical, stout setulae, thereafter ventrally robustly developed, ventral margin rounded, slightly tapered in lateral view ( Fig. 12 ) quadrate on basal half, thereafter apically with short, thumb-like, broadly rounded apical process; postsurstylus symmetrical, in lateral view ( Fig. 15 ), elongate, moderately narrow, sinuous, bearing short, fringe-like setulae on posterior margin, in ventral view ( Fig. 13 ) pointed medially, angulate subapically, apex truncate, lacking a rod-like, extended process; subepandrial plate in ventral view moderately and widely U-shaped, lateral arms recurved, tapered toward apex, in lateral view ( Fig. 15 ) as a parallelogram; aedeagus in lateral view ( Fig. 15 ) somewhat rectangular on basal half, apical portion narrower, digitiform, apex narrowly rounded, in ventral view ( Fig. 14 ) elongate, base ovate, apical third abruptly narrowed, narrowly digitiform; phallapodeme in lateral view ( Fig. 15 ) broadly helmut-like, extended keel wide and moderately high, in ventral view ( Fig. 14 ) elongate, slender, T-shaped; pregonite fused, in lateral view ( Fig. 15 ) a curved, rod-like process, bearing 2 setulae apically; hypandrium in ventral view ( Fig. 14 ) broadly and robustly semi-circular, anterior margin broadly rounded, laterobasal margin with angulate extension, thereafter posteriorly narrowed, in lateral view ( Fig. 15 ) deeply pocket-like but with deep emargination, basal portion curved, bar-like, anterior portion triangular.

Type material. The holotype male is labeled BRAZIL. Paraná: Parque Iguaçu[,] 25°33.4'S, 49°13.6'W; 880 m), 22Jan 2010 [,] D. & W. N. Mathis/ Holotype ♂ Mimapsilopa iguassu Mathis , Costa, & Marinoni DZUP [red]. The holotype is double mounted (minuten in a block of plastic elastomer), is in excellent condition, and is deposited in DZUP. Twenty-three paratypes (12♂, 11♀; DZUP, USNM) bear the same locality data as the holotype but with dates from 22 Jan–14 Apr 2010.

Type locality. BRAZIL. Paraná: Parque Iguaçu (25°33.4'S, 49°13.6'W; 880 m).

Distribution ( Fig. 52 ). Neotropical: Brazil (Paraná).

Etymology. The species epithet, iguassu , refers to the type locality, Parque Iguaçu, in the Municipality of Curitiba, Brazil, and is a noun in apposition.

Remarks. Externally this species is similar to M. acta but can be distinguished from it and other congeners, especially those of the cressoni group, by the coloration and shape of the basal flagellomere, the pattern of infuscation of the wing, and by structures of the male terminalia.

Figures

FIGURE 52. Distribution map of Mimapsilopa. Mimapsilopa acta n. sp. (■); M. iguassu n. sp. (●); M. onssa n. sp. (♦); M. plaumanni n. sp. (■); M. rugosa n. sp. (▲); M. xingu n. sp. (●).

FIGURES 8 – 10. Mimapsilopa iguassu n. sp. (8) Head, anterior view; (9) Same, lateral view; (10) Same, oblique view. Scale bar = 0.2 mm.

FIGURES 11 – 15. Mimapsilopa iguassu n. sp. (11) Epandrium, cerci, presurstylus, posterior view. (12) Same, lateral view. (13) Postsurstyli and postsurstylar process. (14) Aedeagus, hypandrium, phallapodeme, pregonite, subepandrial plate, ventral view. (15) Same, postsurstylus, lateral view. Scale bar = 0.1 mm.

FIGURES 46 – 51. Wings: (46) Mimapsilopa xingu n. sp.; (47) Mimapsilopa rugosa n. sp.; (48) Mimapsilopa onssa n. sp.; (49). Mimapsilopa iguassu n. sp.; (50). Mimapsilopa acta n. sp.; (51). Mimapsilopa plaumanni n. sp.