Neoacanthoneura steyskali Kameneva, new species
Creators: name: Kameneva, Elena P.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Ulidiidae
Neoacanthoneura
Neoacanthoneura steyskali

description: Neoacanthoneura steyskali Kameneva, new species
(Figs. 37–38)
Type material. Holotype ♂: COSTA RICA, Sector Cocori 30 km al N de Cariari, Prov. Limón, 100 m, XII.1993, L_N286000_567500, #2495, E.Rojas (INBio CRI001647247) (INBio). Paratypes: COSTA RICA: ♂, ♀, Finca la Selva Pto., Sarapiqui, Heredia, II.1990, 268800_235300, C. Chaves & R. Aguilar (INBio CRI000 125004 and 125951) (INBio); 2♀: Prov Alajuela, San Carlos, P. N. Arenal, Sendero Pilón, 600 m, Malaise [trap], 1–18. V.1999, I_N 269100_457900, #52648 and 17–18. V.1999, L_N 269100_457900, #53363, G. Carballo (INBio CRI001 3307392 and INB0003307929) (INBio, SIZK); ♀, Sector San Ramon, Prov. Alaju. [ela], 620 m, 13–28.III.1994, L_N 318100_381900, #2766, D.Garcia (INBio CRI CRI001 739201); ♀, Estación Sirena, Prov. Punta. [renas], 1– 100 m, IX.1998, L_S 270500_508300, #2362, G. Fonseca (INBio CRI001 628136); ♀, Rancho Quemado, Pen. [insula] Osa, Prov. Punt. [arenas], XI.1990, L_S 292500_511000, F.Quesada (INBio CRI000 311681) (INBio); ♀, Estrella Valley, Pandora, 28.III.1984, Malaise trap, G. V. Manley (DEBU); ♀, Heredia, La Selva Field Sta. [tion] near Puerto Viejo, 21–28.III.1988, W.E.Steiner, J.M.Hill, J.M.Swearingen, J.M.Mitchell (USNM); ♀, PANAMA, Barro Colo. [rado], C.[anal] Z.[one], I–III.1944, 5126, J. Zetek (USNM); ♂, PANAMA, Loma Boracho, C.[anal] Z.[one], light trap, 29.X.1951, F.S.Blanton collector (USNM); ♀, PANAMA, Molinga Swamp, Fort Sherman, C[anal] Z[one], 3.I.1952, F.S.Blanton collector (USNM); ♂, PANAMA, Fort Gulick, C.[anal] Z.[one], 31.VIII.1953, F.S.Blanton collector (USNM); PANAMA: ♂, 2♀, Canal Zone, Colon, Humid forest, Canopy fogging, 2–14.VII.1979, E.Broadhead et al., B.M. 1979–125 (BMNH).
Diagnosis. Neoacanthoneura steyskali is very similar to N. chiroptera in the wing shape (in male the costal margin of the wing angulated at the level of half the distance between dm-cu and the wing apex) and pattern (the oblique cuneiform subbasal crossband is separated or only narrowly connected to the short brown accessory crossband between the base of the subcosta and R2+3; the complete discal crossband is connected to the arcuate or crescentis apical band), differing from other species of the genus by these characters. Neoacanthoneura steyskali differs from N. chiroptera by the short accessory crossband narrowly touching the subbasal crossband along R2+3 or separated by the hyaline interval along R2+3 at most as wide as the accessory crossband (at least 1.5 times as wide as the accessory crossband in N. chiroptera) including the hyaline spot in cell r2+3 mostly separated from other hyaline areas.
Description. Male. Head yellow with whitish face and brownish occiput; length: height: width ratio 1: 1.3: 1.5, with compound eye 1.45 times as high as long and frons 1.5 times as long as wide. Head setae, coloration and appendages as described for N. brachioptera; flagellomere 1 and gena as in N. brachioptera. Thorax as in N. apicalis. Legs yellow with black setae and setulae; fore tibia, mid and hind femora and tibia often brownish; midtibial spur 2–2.5 times as long as midtibia wide; basal tarsomeres of fore and hind tarsi with brushes of black setulae.
Wing (Fig. 37) hyaline with brown pattern, as in N. chiroptera, except short accessory crossband (transverse bar at base of pterostigma) delimiting subrectangular hyaline spot in cell r2+3 closed or only narrowly opened into hyaline field along vein R2+3, with gap usually shorter than accessory crossband apically of it. Costal vein evenly arcuate, sharply produced anteriorly at 0.8 of wing length, with ventral row of setulae with 8–9 thick setulae at R1 apex level, often thickened, short and dentate, and conspicuously flattened and widened between R1 and R2+3 apices, setulae of dorsal row thin and unmodified. Pterostigma narrow, 1.25–1.65 times as long as costal cell. Vein R1 setulose on apical half, distally of Sc apex, with conspicuous setulae also over basal half, mostly subparallel to costa, scythe-like broadened and flattened between R1 and R2+3 apices. Vein R2+3 conspicuously undulate. Vein M ratio m3: m2: m4 = 1: 7.2–11: 5.5–8. Wing length 2.5–3.8 mm.
Male abdomen and epandrium (not dissected) superficially as in N. chiroptera.
Female (Fig. 38) similar to male, but wing venation less modified, as described for N. brachioptera; R1 bare proximally of Sc apex level, pterostigma 1.2 times as long as costal cell, wing pattern as in N. chiroptera, except hyaline spot in subbasal crossband narrowly closed or narrowly open, as in male of N. steyskali; wing length 2.9– 3.4 mm; thorax, abdomen and legs as described for N. apicalis; terminalia not dissected.
Etymology. The species is named in memory of American dipterist George Constance Steyskal (1909–1995), whose preliminarily studies of Neoacanthoneura were partly integrated into this revision.
description: Published as part of Kameneva, Elena P., 2012, Revision of Aciuroides Hendel and Neoacanthoneura Hendel (Diptera: Ulidiidae: Pterocallini), pp. 1-33 in Zootaxa 3227 on pages 24-25, DOI: 10.5281/zenodo.280302