Eutabanus pictus Krober 1930
Creators: name: Krolow, Tiago Kütter
name: Bayless, Keith M.
name: Henriques, Augusto Loureiro
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tabanidae
Eutabanus
Eutabanus pictus

description: Eutabanus pictus Kröber, 1930
(Fig. 1. A–H male, I–O female)
Refs. Kröber, 1934: 260 (cat.); Fairchild, 1956: 26, 1961: 440, 1967: 331, 1971: 58 (cat.); Moucha, 1976: 208 (cat.); Fairchild & Burger, 1994: 90 (cat.); Coscarón & Papavero, 2009: 92 (cat.).
Diagnosis: Mimetic of Sarcophagidae (Diptera), body predominantly black with some white pilosity; scutum black with two slender stripes with white pruinescence; notopleural lobe with an acute anterior projection; wing hyaline with an abbreviated irregular discal band; abdomen black with narrow posterior band with white pruinescence and pilosity.
Male. Body (Fig. 1 A) length (without antenna) 10.7–11.0 mm, wing length 8.2–8.5 mm. Head: Holoptic eyes (Fig. 1 B), bare and dark gray or brown (dried specimens), largest ommatidia occupying upper 2/3 and smallest ommatidia lower 1/3, but without accentuated demarcation; ocellar tubercle not prominent, with black pilosity; frontal triangle black; subcallus with white pruinescence, without pilosity; gena and parafacial with white pruinescence and pilosity; face with white pruinescence laterally and dark brown in middle. Palpus prorrect, black with black pilosity and sparse white pilosity. Antenna (Fig. 1 C) dark; scape and pedicel black with black pilosity; flagellum dark brown, basal plate (first flagellomere) with acute dorsal projection; antennal flagellum with three free flagellomeres distal to basal flagellomere complex. Proboscis unsclerotized with theca and labellum black.
Thorax: Scutum black with sparse black pilosity and two narrow longitudinal stripes of white pruinescence; notopleural lobe (Fig. 1 D) with acute anterior projection, black with black pilosity, except for white pruinescence at base; postalar callus and scutellum both with anterior half black and posterior half white, with black and white pilosity mixed. Pleuron and sternum dark brown with largest area covered by white pruinescence and black and white pilosity. Legs dark brown to almost black, with black pilosity, except for coxae with gray pruinescence; fore and mid tibiae somewhat inflated; hind tibia flattened and fringed. Wing hyaline, except for base to middle of cells br and bm, costal margin, and brown abbreviated irregular band from pterostigma to discal cell; basicosta without macrosetae; pterostigma dark brown to black; appendix at fork of R4 +5 absent.
Abdomen (Fig. 1 A): Tergites predominantly black; tergites 1–2 with posterior transversal band and lateral margins with white pruinescence and pilosity; tergites 3–7 with narrow posterior transversal band with white pruinescence, enlarged in middle and laterals. Sternite 1 light brown with central spot of white pruinescence; sternite 2 light brown with white pruinescence; sternites 3–6 light brown with posterior transversal band of white pruinescence, and lateral spots of black pruinescence; sternite 7 dark with slight white pruinescence.
Terminalia: Epandrium, cercus and hypoproct as in figures 1E–F. Epandrium divided into two parts joined medially by membrane, broad at posterior region (almost together) and further narrowed from middle to anterior regions (disjointed); anterior region glabrous, with sparse pilosity on posterior region. Cercus rounded with apex slightly pointed, covered with long pilosity. Hypoproct (dorsal view) covered by cerci, only with apex visible. Hypandrium, gonocoxite, gonostylus and aedeagus as in figures 1G–H. Hypandrium + gonocoxite robust, longer than wide, with anterior margin truncated, slightly rounded in lateral corners. Hypandrium with circular depression anteriorly. Gonocoxite tubular, narrowed posteriorly, with long expansion at apex. Aedeagus long, pointed, slightly longer than gonocoxal apodeme. Gonostylus enlarged at apex with V-shaped depression.
Examined material: BRAZIL, Amazonas: Manaus, Hotel Ariaú, 02.vii.2010, lençol iluminado, col. F.F. Xavier Filho (1ď, 1Ψ); Idem, Maués, Rio Abacaxis (Campina Pacamiri), 04°35’49’’S; 58°13’14’’W, 30–31.v.2008, Arm. Suspensa dossel mata, col. J.A. Rafael e equipe (1Ψ); Idem, Rio Jaú, 01°52’34’’S; 61°35’15’’W, 29.vii–08.viii.2001, Arm. Suspensa lâmina d’água, col. A.L. Henriques & J. Vidal (1Ψ). PERU, Loreto Pr., nr. Jct. Rio Marañón & Ucayali, 73.5°W 4.8°S, 6–20.viii.1994, Flight trap, col. P. Skelley, Eutabanus pictus Kröber ď det J.F. Burger, 1994 (1ď).
Comments: The male of E. pictus is very similar to the female (Fig. 1 I, L), except for narrow and less prominent dark stripes of pruinescence on the scutum, and the sexually dimorphic characters of the holoptic eyes and prorrect palpi in males. However, both sexes share two characters for easy recognition: notopleural lobe with an acute projection, and antennal stylus reduced with only three flagellomeres.
Coscarón and Papavero (1993: 106, fig. 70A) documented the notopleural lobe of the female as prominently rectangular, using only one specimen without locality information. However, the females observed here (Fig. 1 I, K), and by Fairchild (1961) and Henriques and Gorayeb (1993) have described the notopleural lobe as specified above in the male (Figs. 1 A, D). Some characters of the terminalia documented by Coscarón and Papavero (1993: 106, fig. 70D) disagree with those observed here, mainly including the spermatheca (Fig. 1 N) and the length of spermathecal ducts (Fig. 1 O), although the genital fork (Fig. 1 O) is very similar. Tergite 10, cercus and hypoproct of female are illustrated for the first time here (Fig. 1 M).
description: Published as part of Krolow, Tiago Kütter, Bayless, Keith M. & Henriques, Augusto Loureiro, 2012, Newly discovered males and new records of the uncommon Neotropical genera Eutabanus Kröber and Myiotabanus Lutz (Diptera: Tabanidae), pp. 25-33 in Zootaxa 3389 on pages 26-28, DOI: 10.5281/zenodo.214220