Taxonomic revision of the Neotropical genus Argentinomyia Lynch-Arribálzaga, 1891 (Diptera: Syrphidae), with description of 16 new species Author Montoya, Augusto L. 0000-0003-3307-034X aleon.montoya@udea.edu.co Author Wolff, Marta 0000-0002-3389-7083 martha.wolff@udea.edu.co text Zootaxa 2023 2023-02-03 5234 1 1 157 http://dx.doi.org/10.11646/zootaxa.5234.1.1 journal article 53225 10.11646/zootaxa.5234.1.1 be77753c-0c7a-4f90-a020-f23b778d06d0 1175-5326 7609993 A540F250-BDE2-43F7-83A1-DA261F914B41 Argentinomyia testaceipes Lynch-Arribálzaga, 1891 ( Figs 1A–B , 81 , 82 and 94A ) Argentinomyia testaceipes Lynch-Arribálzaga, 1891: 200 (41). Type locality: Argentina. Prov. Buenos Aires , Chacabuco . HOLOTYPE Female MACN (non-examined). Refs.: Lynch-Arribálzaga, 1891:199 (1892c: 41): 268 ( Fig. 4 , habit) Argentinomyia testaceipes . Thompson et al. 1976: 57 Argentinomyia testaceipes . Thompson 1999: 338 (Synonyms and status notes) Argentinomyia testaceipes . Reemer & Ståhls 2014: 151 Rhysops lopesi Fluke, 1945: 6 . Type locality: Brazil . S„o Paulo, S„o José dos Campos. HOLOTYPE Female AMNH (Examined). Refs.: Fluke, 1945: 26 ( Fig. 5 , head, lateral view, female) Rhysops lopesi . Thompson et al. 1976: 43 Type material. HOLOTYPE . Adult Male , ARGENTINA . Prov. Buenos Aires , Chacabuco , 173m ( MACN ) . PARATYPE , BRAZIL . São Paulo , São José dos Campos , 53 m , 9.x.1933 , H. S. Lopes ( 1♀ , AMNH ) . Length (n= 3): Body, 7.3–8.5 mm ; Wings, 7.1–7.5 mm . Diagnosis. Face with a low tubercle and with no prominent depressions dorsally; antennae elongate, the scape nearly four times as long as pedicel and about twice as long as basoflagellomere, arista thick and pilose; frontal prominence greatly produced; female frontal triangle wide, male dichoptic; sides of the face evenly white pubescent, except for a median vitta, which is broadest over tubercle, not punctuated; mesonotum highly polished, short golden pilose; without a pollinose vitta on anterior half; metafemur without long yellow pile, metatibia yellow; abdomen metallic, without orange maculae; surstylus with dorsal and ventral margins approximately of the same width in the whole length; apex of hypandrium (superior lobes) short, as long as wide. Redescription. MALE. Head ( Fig. 81A ): Face shining black, white pile except for some brownish hairs on dorsal half of frontal triangle. Face with a very low elongate tubercle, only slightly concave ventral antennae, with no distinct transverse depressions, although there are two very faint depressed lines immediately above the tubercle. Face entirely covered with white pollen except for a median vitta, which is broadest over the tubercle; oral tips somewhat produced ventrally, a shining area between eyes and oral tips. Frontal triangle highly polished with coppery reflections, extremely wide; ocelli on a slightly raised triangle, pile white ventral, more brownish in a wide band across vertex. Gena heavily coated with white pollen and white pile; side of the tubercle is a large, rectangular, flat, slightly rugose area, although the wrinkles show only on dorsal edge; brown, pile also appears on rather wide dorsal part of the occiput, rest of occiput with white pollen and pile. Antennae yellowish, inserted on a raised base, long, ratio 3.0:0.75:1.5, scape extremely long, black pile; pedicel dark brown, about 1/4 as long as scape; basoflagellomere black and about 1/2 as long as the scape; arista thick, about as long as the third segment, yellow at base and dark on apical 1/3, bare. Thorax ( Figs 81B–C ): Black, mesonotum highly polished, short golden pilose; without pollinose vittae on anterior half, pile yellow. Pleura shiny black, white pilose, white pollinose. Pleura shiny bluish cast, covered with white pollen and rather long white pile. Scutellum polished, but with two rugose depressions near the tip, pile entirely white; fringe with short golden pile; notopleura with only a slight indication of tubercle. Wing ( Fig. 81A ): Hyaline, stigma diluted yellow, microtrichose, except cell c bare basal 1/6, cells bm and r only slightly bare basally, cell cua pilose, calypter wholly yellowish-white; plumula white, halter yellowish-white, capitulum white. Legs ( Fig. 81A ): Yellow; pro- and mesofemora brown on basal 1/2; metafemur brown on basal 2/7 and apical 1/7; pro- and mesotibiae yellow, metatibia yellow with a broad black ring on apical 1/3, pile everywhere yellow, tarsomeres orange-brownish, yellow pilose, except a few black pile in the metatarsi. Abdomen ( Fig. 81B ): Everywhere polished with dark brown to black reflections, no evidence of yellow maculae anywhere, pile all white except for some darker hairs down the middle of the 4 th tergum; sterna black shining, yellow pilose; male genitalia: surstylus in lateral view ( Fig. 82A ) with dorsal and ventral margins approximately of the same width in the whole length, shorter than broad; hypandrium in ventral view ( Fig. 82C ) narrowed laterally towards the apex; aedeagal lobe in ventral view ( Fig. 82C ) circular, apex rounded. FIGURE 81. Argentinomyia testaceipes Lynch Arribálzaga, 1891 , male (USNM ENT 01443767): A. Head, frontal view; B. Dorsal view. Female (CEUFLA): C. Cabeza, Lateral view D. Head, frontal view; E. Dorsal view; F. Lateral view. Scale bars: 5 mm. FEMALE ( Figs 81C–F ). Similar to male except for usual sexual dimorphism and differing in frontal prominence greatly produced and legs yellow. The female of A. testaceipes is similar to A. norrbomi sp. nov. but differs from it by the face with a low tubercle, with no distinct transverse grooves above the tubercle. Frontal prominence greatly produced. Legs yellow. Abdomen metallic, without orange maculae. In A. norrbomi sp. nov. the face with four or more distinct transverse grooves above the tubercle. Frontal prominence not greatly produced. Legs yellow, except metafemur black on apical 1/2. Abdomen with orange maculae. FIGURE 82. Argentinomyia testaceipes Lynch Arribálzaga, 1891 , male genitalia. A. Whole genitalia, lateral view; B. Epandrium, dorsal view; C. Hypandrium, ventral view. Scale bars: 1 mm. Taxonomic notes. Argentinomyia testaceipes is differentiated from A norrbomi . Sp. nov. by the following combination of characters: face without transverse grooves above the tubercle; frontal prominence greatly produced ( Figs 81A, D ); metafemur yellow ( Figs 81A, C, D, F ); abdomen metallic, without orange maculae ( Figs 81B, E ). In A. norrbomi sp. nov. the face with four or more distinct transverse grooves above the tubercle; frontal prominence not greatly produced ( Figs 55A, D ); legs yellow, except metafemur black on apical 1/2 ( Figs 55A, C, D, F ); abdomen with orange maculae ( Figs 55B, E ). Based on males, A. testaceipes differs from A. norrbomi sp. nov. in having the surstylus in lateral view ( Fig. 82A ) with dorsal and ventral margins approximately of the same width in the whole length [ versus surstylus with dorsal margin slightly concave and ventral margin slightly convex in A. norrbomi sp. nov. ( Fig. 56A )]; apex of hypandrium (superior lobes) in ventral view ( Fig. 82C ) short, as long as wide [apex of hypandrium elongated, about 3× longer than wide in A. norrbomi sp. nov. ( Fig. 56C )] (see “diagnosis” under each species or key). Comments. The Holotype specimen of Rhysops lopesi is currently in the AMNH. Photos are available on their website AMNH: https://sci-web-001.amnh.org/imulive/iz.html?#details=ecatalogue. 10021027 and non-type specimen in the USNM: http://syrphidae.myspecies.info/taxonomy/term/117. Geographical range. Argentinomyia testaceipes (n= 8) is distributed in the Serra Ambato in Argentina ( Buenos Aires , Puerto Catamarca ), Brazil ( Paraná , S„o Paulo ) and the Eastern slope of Cordillera Azul in Perú * ( Previsto ) ( Fig. 94A ). The species is present at low and middle altitudes ( 53–1274 m ) in the following biogeographical domains and provinces: Paraná ( 53–1274 m ) : Araucaria Forest ( 895–1274 m ) and Atlantic Forest ( 53–750 m ) ; Chacoan ( 173–1226 m ) : Chaco ( 1226 m ) and Pampa ( 173 m ) . Non-type material examined. ARGENTINA . Puerto Catamarca , Cuesta del Clavillo-IBP Program Frst , - 27,978 958, -65,74794, 1226 m , J.L. Neff ( 1♀ , USNM ENT 01443766 ; http://syrphidae.myspecies.info/taxonomy/ term/117) . BRAZIL , Paraná , Ponta Grossa , Pq Estadual de Vila Velha-IAPAR, -25,246336 , -50,02104 , 895 m , 7.v.2007 , M.N. Morales ( 1♀ , CEUFLA ) ; Refugio de vida silvestre dos campos de Palmas , -26,533807 , -51,599362 , 1200 m , A. Couto (1♁, 1♀ , DZUP ) ; São Paulo , Barueri , -23.511369 , -46.872942 , 750 m , 12.viii.1957 , K. Lenko (1♁, USNM ENT 01443767 ) . Identified as Rhysops lopesi by Thompson (1971). PERÚ . Previsto , -9.0901948 , - 75.737630 , 800 m , 24.vi.1967 , J. Schunke ( 1♀ , BMNH ) .