Aspistomella enderleini Kameneva & V. Korneyev, 2024

Kovac, Damir, Kameneva, Elena P., Korneyev, Severyn V., Araújo, Alexandre Santos, Savaris, Marcoandre, Smit, John T., Schneider, Alexander, Schreiber, Robert & Korneyev, Valery A., 2024, Revision of the Aspistomella group of genera (Diptera: Ulidiidae: Pterocallinae: Lipsanini), Zootaxa 5530 (1), pp. 1-117 : 39-42

Aspistomella enderleini Kameneva & V. Korneyev , sp. nov.

urn:lsid:zoobank.org:act:95BFDD08-B74D-4CA1-93AF-021E86C2E16D

Figs 5 H , 22–23

Material examined. Type. Holotype ♂: Colombia: “Cordill.[eren] v.[on] Columbien / terra temporada / Thieme S.” ( MNKB) . Paratype: 1♀: same label as in holotype, “69”, “ Euxesta lunata Enderlein det.” ( MNKB) .

Diagnosis. Aspistomella enderleini is similar to A. lobioptera , A. lunata , and A. steyskali in that the wing apex has a long, narrow and oblique preapical hyaline incision from the apical half of cell r 1 into cell m, usually reaching the anterior margin of the wing and separating a narrow crescent-shaped brown apical band from the rest of the dark pattern, with the base of cell m completely dark ( Fig. 5 H ), vein R 1 bare, prescutellar acrostichal setae present and halter yellow; it is similar to A. lobioptera and A. steyskali in that the costal vein is bent anteriorly before the apex of vein Sc, the costal cell is lobed (though less than in the compared species), the costal vein is slightly thickened before the apex of the subcostal vein, forming a more or less conspicuous cleft, and differs from them in that the pterostigma is only moderately short, almost as long as the width of the costal cell ( Figs 5 H , 22 F ). It shares the wing pattern very similar to A. steyskali : both differ from A. lobioptera by the cell dm apically of r-m with hyaline spot connected to the hyaline spot in cell m 4 and by the phallus not modified, moderately developed (in A. lobioptera cell dm entirely dark and phallus very long and trichose). It can be distinguished from A. steyskali only by the structure of surstyli, which are ventrally blunt, with short denticles on the posterior margin, but without expressed lobes and prensisetae, only with slightly thickened setae (in A. steyskali , outer surstylus with two well developed lobes, inner surstylus with 3–4 thick prensisetae); it also differs from A. steyskali by a pterostigma almost as long as wide (in A. steyskali , pterostigma very narrow); but the variability of this character has not been studied. Aspistomella enderleini is similar to A. lunata in having pterostigma almost as long as wide, but differs from it in that the hyaline incision distal to the pterostigma is short, extending at most into cell r 2+3 and isolated from the round hyaline spot at the base of cell r 4+5 (in A. lunata , it extends into cell r 4+5 distally from crossvein r-m).

Description. Male. Head ( Figs 22 D–E ) ratio (length: height: width) = 1: 1.5: 1.9; frons, face above transverse fold, parafacial, and gena reddish or yellowish brown, epistome and occiput mostly black. Frons moderately wide, slightly narrowed posteriorly ( Fig. 22 E ), as long (from lunule to anterior ocellus) or 1.4× (from lunule to inner vertical seta) as wide at lunule; vertex black, steel shining, sparsely microtrichose; orbits, vertex, gena and occiput silver-white microtrichose; parafacial narrow, 0.2–0.3× broader than postpedicel, reddish-yellow, sparsely white microtrichose. Frontal plates with 8–9 pairs of parafrontal setulae, 3–5 pairs of inclinate frontal setae slightly shorter than outer vertical seta, frontal vitta whitish microtrichose, with 2–4 shorter, proclinate or inclinate interfrontal setulae ( Fig. 22 E ). Lunule very narrow, indistinct, reddish-yellow. Eye 1.4× higher than long. Epistome widely black medially, reddish brown laterally and anteroventrally, sparsely white microtrichose, with metallic bluish sheen, strongly produced anteriorly and separated from upper part of face by deep fold; face above epistome brownish yellow, white microtrichose. Clypeus yellow to brown, sparsely white microtrichose, subshiny, 0.38× higher than epistome. Gena brownish yellow, with long genal seta and 5–7 additional long peristomal setae anterior of it, 0.3–0.8× longer than genal seta. Occiput black, except postgena partly brown, with cyan metallic sheen, greyish microtrichose.

4+5

Antenna brown; scape and pedicel with black setulae; postpedicel yellowish brown, 1.6× longer than wide, darker apico-dorsally, whitish microtrichose, twice as long as wide, apically rounded; arista black except yellow at base, almost bare. Mouthparts black, prementum black, shiny. Palp yellow or yellowish brown, narrowly crescent-shaped, apically rounded, with 10–12 strong black setulae, of which 3–4 subapical setulae 1.6–2× longer than other setulae.

Thorax ( Fig. 22 C ) brown to black, with bluish sheen and sparse white and brown microtrichia not obscuring underlying cuticle. Mesonotal scutum 1.2× longer than wide; black setulose, with 6–12 irregular rows of setulae between rows of dorsocentral setulae; acrostichal prescutellar seta present; prescutellar area with 4–6 rows of setulae between posterior dorsocentral setae. Scutellum dorsally very slightly convex, brown to black, subshining, sparsely microtrichose, without setulae, with golden, silver or bluish sheen. Subscutellum shiny, dark brown to black. Mediotergite shiny black, medially not microtrichose. Other setae as described for the genus. All the setae and setulae black.

Wing ( Figs 5 H , 22 A, B, F ) 3.5–4.2 mm (♀) long, 2.4–2.5× longer than wide; basicostal cell hyaline; costal cell lobed, 5× longer than wide, brown in basal and apical quarter of length, with costa conspicuously curved, posteriorly covered with longer setulae and forming conspicuous cleft before apex of vein Sc; pterostigma entirely brown, narrow triangular, 1.3–1.4× longer than wide and as long as costal cell width, vein R 1 bare, ending proximally of crossvein r-m level in both sexes; vein R 2+3 slightly sinuate. Crossvein r-m distally of middle (at 0.6) of cell dm width. Cell r 4+5 5× longer than wide, apically narrowed. Cell m 1 subtriangular; ultimate section of M 1 = 2.4–2.8× longer than crossvein dm-m and 1.5× longer than penultimate section. Vein CuA Z-shaped, forming moderately short posteroapical lobe of cell cua along vein CuP, 1.7–1.9× longer than its anterior shoulder. Wing pattern with short subbasal crossband from humeral vein through cell cua into alula, and large dark brown mark from apical part of costal cell to wing apex, with 4 hyaline marks: incision from cell r 1 into cell r 2+3 basal to of crossvein r-m, oval spot in base of cell r 4+5 and hyaline incision in apex of cell m 4 extending into apical half of cell dm, and long and narrow crescent-shaped or arcuate incision from apex of cell m 1 into cell r 1 parallel to wing apex ( Fig. 5 H ). Cell cup (anal cell sensu Kameneva & Korneyev 2010) and anal lobe as wide as cell cua. Alula twice as long as wide, uniformly pale grey or darkened in apical half. Calypters white, with white ciliae. Halter yellow.

Legs ( Figs 22 B, C ): coxae and trochanters, apices of femora and tibiae brown, fore femur yellowish brown, otherwise black; tibiae mostly black; tarsi brown, black setose and setulose. Fore femur with row of 6–7 posterodorsal and 4–5 posteroventral setae. Mid femur anteriorly with short suberect setulae; mid tibia apically not visible, hidden by glue.

Abdomen brown to black, sparsely black setulose, metallic sheen inconspicuous in type specimens.

Male genitalia ( Figs 23 A–F ) with short non-projecting cerci, wide ventrally blunt surstyli, with two short denticles on posterior margin, without expressed lobes and prensisetae, 3–5 unmodified setulae (one on inner surstylus, of which one twice as long and thick as the others; phallus moderately large, at most twice as long as epandrium height, short and sparsely trichose ( Figs 23 B–D ). Hypandrium: phallic guide with laterally triangular and moderately sclerotised lobes ( Figs 23 D–F ) forming conspicuous posterior projections, bearing pair of oval postgonites just anterior to basiphallus ring, and symmetrical pregonites anterolateral to them ( Figs 23 D, F ).

Female terminalia: oviscape 1.3× longer than tergite 5; aculeus with ovoid, long-setulose cercal unit; not dissected.

Etymology. The species is named after the German entomologist and microbiologist Prof. Günter Enderlein, curator of the Diptera collection of the Humboldt University of Berlin in 1907–1942.

Remarks. The type specimens were misidentified by Enderlein as “ Euxesta lunata ” in the MNKB collection.

Figures

FIGURE 5. Aspistomella, wing. A, A. pachitea sp. nov.; B, A. heteroptera Hendel; C, A. duo sp. nov.; D, A. tres sp. nov.; E, A. lobioptera Hendel; F, A. steyskali sp. nov.; G, A. lunata (Hendel); H, A. enderleini sp. nov. Abbreviations: C—costal vein; c—costal cell; dm—discal medial cell; h—humeral crossvein; M1—first branch of media; M4—fourth branch of media; m1— first medial cell; m4—fourth medial cell; ptstg—pterostigma; R1—anterior branch of radius; r1—first radial cell; R2+3—second branch of radius; R 4+5 —third branch of radius; r 4+5 —fourth + fifth radial cell. Scale bar: 1 mm.

FIGURE 22. Aspistomella enderleini sp. nov. holotype ♂ (A, C–G) and paratype ♀ (B). A, B, habitus, left; C, head and thorax, dorsal; D, head left; E, same, anterior; F, wing, anterobasal part; G, labels. Abbreviations: c—costal cell; ptstg—pterostigma; r 1—first radial cell; r 2+3—second + third radial cell; r —fourth + fifth radial cell. Scale bar: 1 mm (same for C, D, and E).

FIGURE 23. Aspistomella enderleini sp. nov. ♂ genitalia. A, postabdomen and part of abdomen, ventral; B, postabdomen, posterior; C, same, lateral; D, same, ventral; E, surstylus and hypandrium, posterior; F, cerci, surstylus, and hypandrium, ventral.Abbreviations: bph—basiphallus; cerc—cerci; ej apod—ejaculatory apodeme; epand—epandrium; hypd—hypandrium; pgt—postgonite; ph g—phallic guide; ph—phallus; phapod—phallapodeme; pregt—pregonite; s—seta; st 4— fourth sternite; st 5— fifth sternite; st 6— sixth sternite; st 7— seventh sternite; st 8—eighth sternite; sur—surstylus; tg5—fifth tergite.