Neohybos aberrans, Ale-Rocha, 2017

Ale-Rocha, Rosaly, 2017, New species of Neohybos Ale-Rocha & Carvalho (Diptera, Hybotidae, Hybotinae) from South America, Zootaxa 4358 (3), pp. 507-531 : 508-510

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Neohybos aberrans

sp. nov.

Neohybos aberrans sp. nov.

( Figs 1–5 View FIGURES1–5 , 55 View FIGURES 55–60 , 61 View FIGURES 61–66 )

Diagnosis. Scutum shiny dorsally, with sparse brown pruinescence laterally and on prescutellar disc; pleura clothed in brown pruinescence; legs brown except for mid tibia and all tarsomeres 1–4 yellow, fore tibia pale brown with base and apex yellow, and hind tibia yellow on basal two-thirds; hind femur with spine-like setae arising from tubercles on ventral and av surfaces; hind tibia cylindrical, thickened on distal third, ventral surface undulate and bearing one tubercle on basal third; wing hyaline.

Holotype male. Body: 3.2 mm. Wing: 2.7 mm. Head: postpedicel 1.3 times longer than wide, as long as length of scape and pedicel combined. Face narrowly dichoptic, as long as frons. Ocellar setae parallel slightly proclinate. Postcranium clothed in sparse pale brown pruinescence. Postocular setae somewhat elongate and slender; occipital setae uniserial, very thin and sparse. Thorax ( Fig. 61 View FIGURES 61–66 ): scutum shiny dorsally, sparse brown pruinescence laterally and on prescutellar disc; pleura clothed in brown pruinescence; scutum black except postalar callus with yellow spot; pleura dark brown. Setae pale brown, mostly short, thin and sparse; acr and dc uniserial, slightly longer on prescutellar disc; ial and spal setae misaligned; 2 npl longer than apical scutellar pair; 1 pal stout; 5 pairs of scutellar setae, apical pair parallel, somewhat stouter, and 3 times longer than lateral setae. Wing ( Fig. 55 View FIGURES 55–60 ): narrow, hyaline, pterostigma hyaline; R4+5 and M1 parallel apically. Legs ( Fig. 61 View FIGURES 61–66 ): brown, except mid tibia and all tarsomeres 1–4 yellow, fore tibia pale brown with base and apex yellow and hind tibia yellow on basal two-thirds. Hind femur thickened with flattened ventral surface; hind tibia cylindrical, thickened on distal third, ventral surface undulate and bearing one tubercle on basal third. Setae pale brown to yellow. Fore tibia with 1 anterior and 1 posterior short preapical setae, not reaching half-length of fore first tarsomere. Fore and mid tarsi with elongate, dorsoapical faintly thickened setae. Mid tibia with 3 short ad setae (1 basal, 1 near mid-length, 1 on distal third); 1 very long preapical ventral seta, extending beyond apex of mid first tarsomere. Mid first tarsomere with 1 short sub-basal pv seta. Hind trochanter with 1 anterior and 2 posterior spines. Hind femur with 1 ad seta on distal fourth; 1 anterior preapical seta; 1 short spine-like pv seta on basal fifth; 9 spine-like setae each arising from tubercles, misaligned, distributed on basal two-thirds of ventral and av surfaces; 6 stout hook-like setae each arising from tubercles, on distal third, arranged in transverse semicircle between ventral and pv surfaces. Hind tibia and tarsus lacking differentiated setae. Abdomen: shiny black except distal margin of tergite 8 covered with sparse brown pruinescence; about 3 times longer than thorax. Setae yellow, thin, very sparse, short dorsally and long on lateral margins of tergites 1–2; sternite 8 lacking long setae on distal margin. Terminalia ( Figs 1–3 View FIGURES1–5 ): right bacilliform sclerite with very long and robust, distally broadened dorsal process, arising lateral to cerci, extended posteriorly beyond right surstylus and bearing long and strong setae. Right surstylus long and setose; left surstylus short and folded inward. Hypandrium short, posterior margin broadly concave, with lateral lobes elongate, slender and subequally long. Postgonites with long, slender median projection, as long as phallus, forked distally; phallus long with truncate apex.

Female. Similar to male, except: fore tibia paler; mid tibia with 1 longer and slender ad seta near base; hind femur slender, av row with 7 spine-like setae longer than in male, ventral surface with 8 short spine-like setae on distal half, 3 short spine-like pv setae near apex; hind tibia straight, not thickened; trochanter yellowish with 1 stout ventral seta. Terminalia ( Figs 4–5 View FIGURES1–5 ): segment 8 about twice longer than wide; tergite 8 sclerotized with membranous distal margin; sternite 8 membranous with median sclerotized area.

Type material. HOLOTYPE ♂ ( INPA) labelled: “ BRASIL . Amazonas / Manaus, F. [Fazenda] Esteio / BR 174, Km 41, ZF3; 24–27.viii.1993 / F.F. Xavier ”; “ Holótipo / Neohybos aberrans / Ale-Rocha, R ” [red label]. Specimen in good condition; not dissected. PARATYPES. BRASIL . Amazonas: Manaus, Reserva Ducke, 20.ix.1982, J.A. Rafael, (1♂); ZF6, Km 41, 04–12.xi.1991, Francisco Xavier (1♂); Fazenda Esteio, Br 174, Km 64, ZF3, 8–, F.F. Xavier (1♀); Am 0 10, Km 54, BI 2, 02°45ʹ33ʺS, 59°51ʹ03ʺW, 21–30.v.1997, [Armadilha] Suspensa / Mata, R.L.M. Ferreira, A.L. Henriques e J.F. Vidal, baixa (1♀); Br 174, Km 72, Faz. [Fazenda] Dimona, 11– 14.iv.1993, F.F. Xavier F., Varredura (1♂); PDBFF, 25.iii.1987, Malaise, Bert Klein (1♂); S. [Santa] Izabel do R. [Rio] Negro, Maturacá, 11–13.x.1990, Malaise, J.A. Rafael (1♀); Querari (Pelotão), 01°05′N, 69°51′ W, 06.iv.– 15.v.1993, João Vidal (1♀); Tabatinga, 13–17.i.1992, J. Vidal & Lilian, varredura (1♂) (all deposited in INPA). GoogleMaps

Additional material. BRASIL. Amazonas: Manaus, Br 174, Km 72, Faz. [ Fazenda ] Dimona , 11–14.iv.1993, F.F. Xavier F., Varredura (1♂, INPA).

Distribution. Brazil (Amazonas).

Etymology. The specific name is derived from the Latin aberrans (irregular, abnormal) in reference to the uncommon aspect of the hind tibia.

Remarks. Specimens were originally preserved in alcohol, and consequently the coloration can be slightly paler than in fresh specimens.


Instituto Nacional de Pesquisas da Amazonia