Sigalopella armeniaca, Irwin & Winterton, 2020

Irwin, Michael E. & Winterton, Shaun L., 2020, A new stiletto fly genus from South America (Diptera: Therevidae: Agapophytinae), Zootaxa 4751 (2), pp. 276-290 : 280-282

Sigalopella armeniaca sp. n.

( Figs 3 –5, 14)

urn:lsid:zoobank.org:act:A56238A6-E565-4C16-BC9E-AA174342CA04

Type material— Holotype female, CHILE: Valparaíso Region: Aconcagua, Rio Blanco [-32.932, -70.281], 1958, L. Peña ( MEI 121486, CNC).

Paratypes: CHILE: Valparaíso Region: 1 male, 4 females, Aconcagua, Piscicultura, Rio Blanco [-32.932, - 70.281], 17.xi–20.xi.1958, L. Peña ( MEI1121302 , MEI121488 , CSCA; MEI121485 , MEI121487 , MEI121489 , CNC) .

Common name. Bicoloured sigalopella.

Diagnosis. Parafacial with domed callus; scape longer than head, barely thicker than base of flagellum; abdomen black with segments 2–4 yellow laterally; femora yellow; wing uniformly dark infuscate.

Description. Body length ca. 8.5 mm. Head: Polished black; frons smooth and slightly rounded with slight transverse furrow immediately below ocellar tubercle (female), sparse dark setae laterally around antennal base, extending ventrally onto parafacial along eye margin; parafacial domed laterally, narrow silver pubescent stripe laterally along eye margin, extending along gena; gena with sparse black setae; occiput black, overlain with silver pubescence laterally on postocular ridge, occipital setae black, sparse dorsolaterally; maxillary palpus black with extensive black setal pile; antennal scape longer than head, barely thicker than pedicel and flagellum, yellow at base only, extensive erect, black setae, shorter in female, much longer in male. Thorax: Scutum and scutellum glossy black with dark setal pile admixed with sparse glaucous pubescence, faint dorsocentral vittae present anteriorly; pleuron black with silver pubescence, denser on lower half; dark setae on katatergite; chaetotaxy: notopleural: 4, supra-alar: 1, post-alar 1, dorsocentral: 1, scutellar: 1; coxae polished black with sparse glaucous pubescence; coxae with black macrosetae, more abundant on forecoxa that other coxae, especially in male; femora yellow, hind femur dark brown dorsoapically; fore- and midtibia yellow, black distally; hind tibia black; tarsi black, some tarsomeres yellow basally; haltere cream-white to yellow; wing dark infuscate, paler posteriorly. Abdomen: glossy black with sparse, scattered, black setae, shorter dorsally, more elongate anteroventrally; segments 2–3 dark yellow laterally. Male and female terminalia: as per genus description.

Etymology. From the Latin: armeniacus —apricot coloured, yellow with a perceptible mixing of red; refers to the colour of the distinctive abdominal colour of this species. A feminine adjective.

Comments. Sigalopella armeniaca sp. n. can be distinguished from all other species of the genus by the striking yellow-orange areas laterally on abdominal segments 2 and 3. In common with S. rufifemoralis sp. n. and S. nigrifemoralis sp. n., this species possesses inflated bulbous parafacial calli laterally as well as a narrower and more elongate antennal scape. In common with S. rufifemoralis sp. n. and S. ammophila sp. n., all femora are yellow. This species occurs inland in central Chile.

Figures

FIGURE 3. Sigalopella armeniaca sp. n., holotype female, lateral view, (body length ca. 7.0 mm).