Argentinomyia sagoti Montoya & Wolff 2023, sp. nov.
Creators: name: Montoya, Augusto L.
name: Wolff, Marta
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Argentinomyia
Argentinomyia sagoti

description: Argentinomyia sagoti Montoya sp. nov.
Proposed standard English name: Sagoti’s long-antennae flower fly.
(Figs 5I, 7B, 71, 72 and 96A)
Type material. HOLOTYPE. Adult Male, pinned, deposited at Colección Entomológica de la Unidad San Cristóbal de las Casas de El Colegio de la Frontera Sur. Original label: “ MEXICO, Chiapas, San Cristóbal de las Casas, L. C. Huitepec ” / “ 16,6876042, -92,599652, 1800–2400m ” / “ 3.vii.2009, P. Sagot ” “ HOLOTYPE / Argentinomyia sagoti / Montoya 2023” (ECOSCE). Identified as Argentinomyia MX –7 by P. Sagot. PARATYPES. Label with the same data as Holotype (1♀, ECOSCE 24470). GUATEMALA. Baja Verapaz, Salamá, Camino Paten a Santa Rosa, 15,062 189, -90,353998, 1600 m, 17.ii.2007, José Monzón (1♁, Colección J. Monzón).
Length (n= 2): Body, 6.9–7.1 mm; Wings, 7.0– 7.4 mm.
Diagnosis. Face with four or more distinct transverse grooves above tubercle; antenna short; wing lightly brown pigmented anteriorly; protibia yellow on basal 1/3; metafemur and tibia yellow on apically 1/3; 2 nd to 4 th terga without maculae; surstylus with dorsal margin slightly concave and ventral margin slightly convex, shorter than broad; hypandrium narrowed laterally towards the apex; aedeagal lobe circular, apex rounded.
Description. MALE. Head (Fig. 71A): Face shining black, on sides white pollinose, with four or more distinct transverse grooves above the tubercle. Frontal triangle and vertex brown pollinose, black pilose. Antenna black, short, ratio 1.3:1.0:1.5, arista black pilose. Thorax (Figs 66B–C): Black, mesonotum shining, silver-steel-blue, golden pilose; with two whitish pollinose vittae on anterior half, pile yellow. Pleura thinly grayish-brown pollinose, yellow pilose, except anepimeron and anepisternum black pilose. Scutellum steel-blue, pile short, black; fringe yellow. Wing (Figs 7B, 71C): Lightly brown pigmented anteriorly, stigma brownish, costal cell bare on basal 1/4, cells bm and r bare on basal 2/3 and 1/3, respectively, cell cua bare on anterior 1/3; calypter wholly white; plumula white, halter orange, capitulum orange-brown. Legs (Fig. 71C): Pro- and mesoleg, pro-, metafemora and tibiae yellow on apically1/3; metatarsus; metatibia, brown pilose. Abdomen (Fig. 71B): Black metallic, 2 nd to 4 th terga without maculae; male genitalia: surstylus in lateral view (Fig. 72A) with dorsal margin slightly concave and ventral margin slightly convex, shorter than broad; hypandrium in ventral view (Fig. 72C) narrowed laterally towards the apex; aedeagal lobe in ventral view (Fig. 72C) circular, apex rounded.
FEMALE (Figs 5I, 71D–F). Similar to male except for usual sexual dimorphism and differing in 2 nd tergum silver and with a large triangular opaque macula extending to the lateral sides in all the tergum length.
Taxonomic notes. Argentinomyia sagoti sp. nov. is similar to A. CR-18 (Figs 6H, 8C), differing by the following combination characters: Face with four or more distinct transverse grooves above tubercle; antenna short (Figs 71A, C, D, F); wing lightly brown pigmented anteriorly (Figs 71 B-C, E-F); protibia yellow on basal 1/3; metafemur and tibia yellow on apically 1/3 (Figs 71A, C, D, F); 2 nd to 4 th terga without maculae (Figs 71B, E). Based on males, A. sagoti sp. nov. differs from A. rugosonasa and A. crenulata in having the surstylus in lateral view (Fig. 72A) with dorsal margin slightly concave and ventral margin slightly convex [versus surstylus with dorsal and ventral margins approximately of the same width in the whole length in A. crenulata (Fig. 27A); surstylus triangular-like in A. rugosonasa (Fig. 70A)] (see “diagnosis” under each species or key).
Etymology. This species is named after Philippe Sagot in recognition of his valuable contributions to the knowledge of the Syrphid fauna from Chiapas, Mexico and in gratitude for borrowing fascinating new material of Argentinomyia for the study. Specific epithet to be treated as a noun in the genitive case.
Remarks. Argentinomyia sagoti sp. nov. occurs in sympatry with A. huitepecensis Montoya, 2021, sharing the type locality: Mexico, Chiapas, San Cristóbal de las Casas, L. C. Huitepec. We suspect that A. sagoti sp. nov. will eventually be found in neighboring areas of the Yucatan Peninsula.
Geographical range. Argentinomyia sagoti sp. nov. (n= 3) is exclusively known from Chiapas-Guatemala Highlands and is spread from the Isthmus of Tehuantepec in Mexico (Chiapas) to the Motagua-Polochic Faults valley in Guatemala (Baja Verapaz) (Fig. 96A). The species is endemic to the Mesoamerican domain at middle altitudes (1800–2400 m) in the Chiapas Highlands province (1800–2400 m).
description: Published as part of Montoya, Augusto L. & Wolff, Marta, 2023, Taxonomic revision of the Neotropical genus Argentinomyia Lynch-Arribálzaga, 1891 (Diptera: Syrphidae), with description of 16 new species, pp. 1-157 in Zootaxa 5234 (1) on pages 119-120, DOI: 10.11646/zootaxa.5234.1.1, http://zenodo.org/record/7609993