Scione gertrudeae sp. nov., 2024

Oliveira, Lia Pereira, Henriques, Augusto Loureiro, Buestán, Jaime & Krolow, Tiago Kütter, 2024, Description of four new species of the Neotropical genus Scione Walker, 1850 (Diptera: Tabanidae), European Journal of Taxonomy 947, pp. 1-19 : 7-10

Scione gertrudeae sp. nov.

urn:lsid:zoobank.org:act:C32F2C3A-4016-4F82-9B32-038D43350321

Figs 4–5

Diagnosis

Frons with white pruinosity and dark brown spot. Vertex dark brown with long black setulae. Parafacial and gena brown with white pruinosity. Clypeus brown with whitish pruinosity. Scape and pedicel dark brown with black setulae, flagellum orange, last flagellomeres blackish. Palpus black. Thorax dark brown with five very evident longitudinal white stripes. Wing slightly smoky with brown veins and weak spots in the crossveins. Abdomen dark brown with black setulae. Tergites 1–2 yellowish brown with white posterior band of pruinosity and setulae along posterior margins. Other tergites darkened, tergites 3–5 with a small posterior median triangle of pruinosity and white setulae.

Etymology

In honor of Gertrude Ricardo, for her invaluable contributions to the knowledge of tabanids.

Type material

Holotype

ECUADOR • ♀ (in good condition); Tungurahua, above Banos; elev. 2.500 m; 14 May. 1978; M. Cooper leg.; “ HOLOTYPE / Scione gertrudeae Oliveira, Henriques, Buestán & Krolow ” [red label]; “ Neotropical , Tabanidae / BMNH(E) 2004-182 / NHMUK 014428020 ” [white label]; NHMUK.

Paratypes

ECUADOR • 1 ♀ (in good condition, hind tibia and tarsi lost, right wing with a small broken area); same data as for holotype; “ NHMUK 014428024 ” [white label]; NHMUK • 1 ♀ (in good condition); same data as for holotype; “ NHMUK 014428022 ” [white label]; NHMUK • 1 ♂ (in good condition, right antenna flagellum lost); same data as for holotype; “ NHMUK 014428023 ” [white label]; NHMUK • 1 ♂ (in good condition, right antenna flagellum lost); same data as for holotype; “ NHMUK 014428021 ” [white label] [photographed specimen]; NHMUK • 1 ♂ (in good condition); same data as for holotype; “ NHMUK 014428025 ” [white label]; NHMUK .

Description

Female ( Fig. 4 )

MEASUREMENTS. Body length: 12 mm, wing length: 11 mm.

HEAD. Frons slightly divergent below, frontal index 1.8 and divergence index 0.7. Vertex dark brown with rather long black setulae, ocellar triangle not very prominent, dark brown ocelli. Frons with black setulae and dark brown spot. Frons and subcallus with white pruinosity. Parafacialia and gena brown with white pruinosity, gena with dense and long white setulae. Clypeus brown with whitish pruinosity and long black setulae, clypeal index 0.7. Scape and pedicel dark brown with black setulae, orange flagellum, blackish last flagellomeres. Palpus black, first segment with long and dense white setulae in the anterior region and short and black setulae in the posterior region, second segment with short black setulae. Proboscis shiny black, 4 × the height of the frons.

THORAX. Scutum and scutellum dark brown with sparse black setulae, scutellum with long setulae. Scutum with five strong longitudinal white stripes, sublateral and lateral stripes connected with strong white stripes at the transverse suture. Notopleuron with tuft of black setulae. Anepisternum with tuft of long, dense black and white setulae. Katepisternum and anepimeron with tufts of long dense white setulae. Post-alar callus with tufts of white setulae. Wing slightly smoky with brown veins and weak spots in the crossveins. M 2 vein complete. r 5 and m 3 cells closed and petiolate, m 3 cell petiole almost imperceptible and of cell r 5 only slightly larger than that of m 3. Short, barely perceptible appendage on the fork of R 4+5 vein and on discal cell. Coxae and trochanters dark brown with white pruinosity, coxae with long dense black and white setulae, trochanters with black setulae. Femora brown with most distal portion orange and black and white setulae. Tibiae orange with short dense black setulae. Tarsi brown with black setulae.

ABDOMEN. Tergites 1–2 yellowish brown and with posterior band of setulae and white pruinosity. Other tergites darkened, tergites 3–5 with small median triangle of pruinosity and white setulae in the posterior region. Sternites 1–2 yellowish, others darkened. All sternites with sparse black and white setulae.

PARATYPE VARIATIONS. Body length 10.4–12.7 mm; wing length: 10.2–11.5 mm; frontal index 1.6–1.7; divergence index 0.7–0.8 and clypeal index 0.5–0.7. M 2 vein incomplete in some specimens, reaching ⅔ or more of its actual size. The r 5 and m 3 cell petiole length also variable, little longer in some specimens. Some specimens without appendix in fork of R 4+5 vein or in discal cell, others with one or more.

Male ( Fig. 5 )

As the female, except for the holoptic eyes, denser and longer body setulae and porrect palpus. Two male specimens (NHMUK 014428021 and NHMUK 014428025) have orange to brown second palp segment.

Distribution

Ecuador (Tungurahua).

Remarks

The species most similar to S. gertrudeae sp. nov. are S. maculipennis (Schiner, 1868) , and S. acris Philip, 1958 . However, S. maculipennis has a reddish yellow abdomen, reddish brown antennae, palpus and clypeus, and S. acris has a predominantly yellowish abdomen, brownish frons and subcallus.

Figures

Fig. 4. Scione gertrudeae sp. nov., ♀, holotype (NHMUK). A. Habitus, dorsal view. B. Head, frontal view. C. Head, lateral view. D. Habitus, lateral view. E. Labels.

Fig. 5. Scione gertrudeae sp. nov., ♂, paratype (NHMUK). A. Habitus, dorsal view. B. Habitus, lateral view. C. Head, frontal view. D. Head, lateral view. E. Labels.