Esenbeckia (Esenbeckia) auribrunnea, Gualdrón-Díaz & Gorayeb, 2020

Gualdrón-Díaz, Juliette Cristina & Gorayeb, Inocêncio De Sousa, 2020, Esenbeckia (Esenbeckia) auribrunnea n. sp. (Diptera: Tabanidae) from theAmazon with a key to the Neotropical species of the subgenus, Zootaxa 4718 (1), pp. 67-76 : 68-70

Esenbeckia (Esenbeckia) auribrunnea n. sp.

( Figs. 1–11 )

Diagnosis. A large orange brown species (length 14–15.5 mm) with orange yellow hairs and gray smoky wings; abdomen banded; tergites 1 and 2 yellowish, semi translucent; sternites bright yellow with the last sternites darker, dark brown larger lateral spots on sternites 3 and 4 and small sublateral spots on sternite 2; legs, pleura and ventral abdomen yellow-orange.

Female. Holotype measurements: body length 15.2 mm; thoracic width 4.9 mm; abdominal width 6.1 mm; wing length 14.3 mm; wing width 4.8 mm; frons height 2.6 mm; frons width at base 0.7 mm; frons width at vertex 0.5 mm; frontal index 3.7; divergent index 0.7; distance between antennae 0.2 mm; basal callus at base 0.3 mm; basal callus at median 0.3 mm; palpi length 2.2 mm; head height 3.7 mm; proboscis length 2.8 mm; ratio proboscis length/head height 0.8; ratio proboscis length/palpi length 1.3.

Head ( Figs. 1, 2, 4, 5 ). Eyes without hairs. Frons ( Fig. 5 ) brown with yellow pruinosity and sparse short brown hairs. Frontal callus shiny brown, ridge-like, approximately half as wide as the frons at the base, not touching the subcallus, reaching the ocellar tubercle. Ocellar tubercle black, not prominent, with three brown ocelli. Vertex with brown and yellow hairs. Subcallus yellowish brown, yellow pruinose marks at the margin of eyes and the base of the antennae, with two weak transverse grooves above the antennal base and a sclerotic midline in a slight depression. Antennae ( Figs. 4–6 ) with yellow scape and pedicel, yellow pruinosity and orange-yellow hairs. Flagellum orange, darkening gradually in the last three flagellomeres. Frontoclypeal cone brown with yellow pruinosity; parafacials and upper surface near to antennal base with yellow hairs. Gena with yellow hairs. Occiput with yellowish white pruinosity, pale yellow hairs in the center and orange-yellow on the upper edge of the eye. Palpus ( Fig. 4 ) yelloworange, first segment with yellow hairs, second segment with yellow and brown hairs scattered on the margin, and some in the central area. Palpi 2/3 of proboscis length. Proboscis dark brown, slightly shorter than height of the head, pale brown labella with a sclerotized dark brown longitudinal stripe. Thorax ( Figs. 1–4 ). Scutum brown with orange yellow pruinosity and bright orange hairs, lateral borders and posterior area with more concentrated yellow pruinosity. Postpronotal lobe pale yellow with pale yellow hairs. Notopleuron orange with orange hairs and pruinosity. Postalar callus orange brown with orange hairs. Scutellum pale brown at the apex with orange hairs and some brown hairs on the sides. Pleura dark brown with orange yellow hairs. Halter dark brown with yellow apex. Calypter brown with orange yellow hairs. Wing ( Figs. 1, 2, 7 ). Tegula with orange and brown yellow hairs. Smoky wing with yellow costal and subcostal cells, long appendix on the R 4+5 vein fork. Cell r 5 closed with petiole approximately as long as the appendix of the fork of vein R 4+5. Legs. Coxa dark brown with yellowish white pruinosity and orange yellow hairs. Femora brown with orange yellow pruinosity and hairs, mid and hind femur slightly darker. Tibiae and tarsi brown with orange yellow hairs. Abdomen ( Figs. 1–3 ). Tergites 1 and 2 semitranslucent yellowish, tergite 1 with orange yellow hairs, tergite 2 with orange hairs on the lateral margin and black hairs in the middle area. Tergite 3 with anterior third dark brown and the rest yellow, covered with black hairs on the anterior margin of the middle third, and orange hairs on the posterior third of tergite 3. Tergite 4 similar to tergite 3, but the dark brown area is wider. Tergites 5 and 6 light brown with black and brownish hairs on the anterior border and yellow hairs on the lateral border. Tergite 7 brown with black hairs and some yellow hairs laterally. Sternites bright yellow with the posterior sternites darker; dark brown lateral spots larger on the sternites 3 and 4, appearing like an extension of the dark brown areas of tergites 3 and 4. Sternite 2 with small fainted sublateral spots. Sternites 4 and 5 with irregular spots in the central and posterior area. Sternites covered with orange yellow hairs, dark hairs only in the central area of the sternite 7. Terminalia ( Figs. 8–11 ). Tergite 9 not separated, wide, two times wider than tergite 10, with large hairs, denser on the lateral border and in the median area. Tergite 10 divided into two lateral pieces, narrow, with short hairs scattered over the entire surface. Cercus ( Fig. 8 ) longer than wide; with large hairs, denser on the distal margin; irregular distal margin, presenting a blunt point at the end of the inner margin and a medial invagination. Hypoproct acute with large hairs on the posterior margin; reaching the third fourth of cercus length. Hypopygium ( Fig. 9 ) longer than wide with large hairs scattered over the entire surface, hairs denser on distal margin, with rounded apices separated by large slit. Genital fork ( Fig. 10 ) concave, lateral extremities of the base with projections, arms short (with relation to width of the base) with small sclerotized expansions. Spermathecal ducts wide, short and sclerotized; spermatheca ( Fig. 11 ) heavily pigmented, elongated, with rounded apex; wider than spermathecal ducts, and large in relation to size of the genital fork.

Male. Unknown.

Variations. The holotype and paratypes 3 and 4 present the palpi with rounded apex, the paratypes 1 and 2 present square apex. The paratype 1 presents a narrower dark brown area on the tergite 4. Spots on sternite 2 vary in size and visibility; the spots are small and weak in the Holotype, darker in the paratypes 2 and 4, and are absent in the paratypes 1 and 3. The paratype 3 shows dark brown spots covering the medial area of sternites 2 and 3 and the posterior border of sternites 3 and 4. The paratypes 2 and 3 present paler scutellum in contrast to the orange-brown scutum. The paratypes 2, 3 and 4 present a light brown proboscis.

Variations in body size are shown in the following measurements (n=5): Body length, mean = 14.9 mm, ranging from 14.0 to 15.5 mm; Thoracic width, mean = 4.8 mm (4.4–4.9 mm); Abdominal width, mean = 5.9 mm (5.1–6.1 mm); Wing length, mean = 14.8 mm (14.0–16.0 mm); Wing width, mean = 4.8 mm (4.3–5.4 mm); Frontal height, mean = 2.5 mm (2.4–2.6 mm); Width frontal at base, mean = 0.7 mm (0.7–0.8 mm); Width at vertex, mean = 0.5 mm (0.4–0.6 mm); Frontal index, mean = 3.5 (3.1–3.7); Divergent index, mean = 0.7 (0.6–0.9); Distance between antennae, mean = 0.2 mm (0.1–0.2 mm); Width frontal at middle, mean = 0.4 mm (0.3–0.5 mm); Callus width, mean = 0.3 mm (0.3– 0.3 mm); Proboscis length, mean = 2.7 mm (2.4–2.8 mm); Head height, mean = 3.6 mm (3.6–3.7 mm); Palpi length, mean = 2.1 mm (2.0– 2.2 mm). Ratio proboscis length to head height, mean = 0.7 (0.7–0.8); Ratio proboscis length to palp length, mean = 1.2 (1.2–1.3).

Etymology. The name auribrunnea comes from the Latin, in reference to the orange-yellow and brown colors presents in the species.

Type material. Holotype. Female, Brazil, Rondônia Ji-Paraná, Line 12B km 12. 17-20.xi.1984. Col. F.F. Ramos, Malaise Trap. ( MPEG) . Paratypes. 4 females. Brazil, Rondônia Ji-Paraná, Line 12B km 12, 17-20.xi. 1984, Col.: F.F. Ramos, Suspended Trap 1.6m. (Paratype 1, 1 female MPEG, Paratype 2, 1 female MZUSP); Brazil, Rondônia Ouro Preto de Oeste , Line 62B km16, Rio Paraiso , 14.xi.1984, Col.: F.F. Ramos, Bait man (Paratype 3, 1 female INPA); Colombia, Vaupés: E.B. [Estación Biológica] Mosiro-Itajura Caparú , Centro Ambiental , 1°4’S, 69°31’W, 60m, 20.i–1.ii.2003, M. Sharkey & D. Arias Leg, Malaise (Paratype 4, 1 female IAvH) .

Figures

FIGURES 1–11: Esenbeckia (Esenbeckia) auribrunnea n. sp. Holotype female: 1) Body in dorsal view; 2) Body in lateral view; 3) Thorax and abdomen in ventral view; 4) Thorax and head in lateral view; 5) Head in frontal view; 6) Antenna; 7) Wing; Paratype female: 8) Tergites 9 and 10, cerci and hypoproct, dorsal view—left side, ventral view—right side; 9) Hypopygium and hypopygial valve dorsal view—left side, ventral view—right side; 10) Genital fork and spermathecal ducts– ventral view; 11) Spermathecae.