Esenbeckia osornoi Fairchild, 1942

Oliveira, Lia Pereira, Henriques, Augusto Loureiro & Krolow, Tiago Kütter, 2023, New records, descriptions, and redescriptions of male horse flies (Diptera: Tabanidae) in Brazil, EntomoBrasilis (e 1033) 16, pp. 1-7 : 2

Esenbeckia osornoi Fairchild, 1942

( Figure 1 )

Male previously described by WILKERSON (1979).

Redescription (♂)

Head ( Figures 1 A-C): Eyes contiguous, glabrous, ommatidia of the same size. Ocellar triangle dark brown, prominent, with yellowish pruinosity, sparse black setulae and three yellow ocelli. Subcallus covered with yellowish pruinosity. Gena and parafacial covered with yellowish pruinosity and numerous black setulae. Clypeus yellowish brown with some black setulae. Palpus porrect, orange with numerous black setulae. Orange antenna. Scape and pedicel with black setulae and yellowish pruinosity. Proboscis sclerotized, shiny, dark brown.

Thorax ( Figures 1 A-B): Scutum and scutellum orange-brown with black and yellow setulae. Thorax with a longitudinal midline of black integument. Legs concolor to the body with black setulae and some yellow setulae. Hind femur pale brown. Wing hyaline with yellowish costal cell and pterostigma. Short appendix at fork of vein R 4+5.

Abdomen ( Figure 1A ): Yellow-green with numerous black setulae. Tergites 4 to 7 darker.

Terminalia ( Figures 1 D-G): Epandrium broad and undivided, anterior region glabrous, posterior region with sparse black setulae. Cercus long, at least twice the size of the hypoproct, shorter than the epandrium, covered with short setulae and with a sharp apex. Hypoproct short, smaller than cerci. Hypandrium + gonocoxite robust, longer than wide. Gonostylus bifid with a slight curvature at the apex. Aedeagus and gonocoxal apodemes equally long.

Material examined: BRAZIL • 1 male; Tocantins, Palmas, TaquaruÇu, Faz.[enda] Encantada ; 10°14′57′′S, 48°07′35.4′′W; 03-10.viii.2012; Arm. [adilha] Malaise; Krolow, T.K. & Lima, H.I.L. leg. / BRAZIL • 1 male; Tocantins, Palmas, Natividade, Balneário Paraíso , Rio Porteira ; 11°39′31.65′′S; 48°3′12.62′′W; 13.vi.2018; Coleta Manual, Krolow, T. K. Equipe leg. / BRAZIL • 1 male; Tocantins, Palmas, TaquaruÇu, Faz.[enda] Encantada ; 10°41′16.3′′S, 48°22′54.7′′W; 31.viii- 07.ix.2012; Krolow, T.K. & Leite, H. leg.

Distribution: Brazil (Amapá, Amazonas, Bahia, Pará, Rondônia, Tocantins), Costa Rica to Colombia, Guyana, Panamá, Surinam, Trinidad, Venezuela ( HENRIQUES 1997; COSCARÓN & PAPAVERO 2009; LIMA et al. 2015).

Comments: WILKERSON & FAIRCHILD (1983) report that the males of only a small percentage of the species in the subgenus Esenbeckia are known, the authors mention that they have found reports in the literature of males of only 15 species. During the dissection process, the left margin of the epandrium suffered a small fracture and part of the gonocoxal apodemes was destroyed.

Figures

Figure 1. Male of Esenbeckia osornoi Fairchild, 1942. A. Habitus, dorsal view; B. Habitus, lateral view; C. Head, anterior view; D-E. Epandrium, cercus and hypoproct (dorsal and ventral views, respectively); F-G. Hypandrium, gonocoxite, gonostylus and aedeagus (dorsal and ventral views respectively). Source: authors.