Megatrigon argentimaculatus Doczkal & Radenković & Lyneborg & Pape 2016, sp. nov.
Creators: name: Doczkal, Dieter
name: Radenković, Snežana
name: Lyneborg, Leif
name: Pape, Thomas
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Megatrigon
Megatrigon argentimaculatus

description: Megatrigon argentimaculatus sp. nov.
urn:lsid:zoobank.org:act: 42BB0474-749D-4B47-BF20-C5C9F1C1B84C
Figs 1C, 2C, 3C, 7C, 10C, 11C, 12C, 15
Diagnosis
Microtrichia pattern of head (Fig. 2C): Frons shiny anteriorly, microtrichiose posteriorly; between frons and vertex bare transversal line; vertex covered with microtrichia, except ocellar triangle, small central area behind ocellar triangle, short longitudinal line medio-posteriorly and head edge; microtrichia of post-ocular orbit exceeded post-ocular ridge and joined with postocellar microtrichia.
Etymology
The species epithet, which is formed as an adjective, is derived from the Latin words argentum (= silver) and macula (= spot), alluding to the large silver spots on abdominal tergites 2+3.
Type material
Holotype SOUTH AFRICA: ♂, Eastern Cape, Albany Dist., Resolution, 23 Apr. 1928, A. Walton leg. (NMSA).
Description
LENGTH. Body 8.0 mm, wing 5.5 mm.
HEAD (Figs 2C, 3C). Microtrichiose stripes on face along eye margin wide and long, extended till tentorial pit and joined with microtrichia below antenna by oblique microtrichiose stripe; distance between eyes a little larger than in M. argenteus comb. nov., 0.17 × width of head; ocellar triangle isosceles, without median longitudinal groove; colour of postpedicel (Fig. 3C) dictinctly darker than pedicel.
THORAX. Mesoscutum with two, wide, lateral microtrichiose stripes and two weak submedian microtrichiose stripes starting as triangular markings and ending as small spots at the level of transverse suture; supra-alar setae yellow; median about 0.50 of width of mediotergite covered by microtrichia.
WING. Membrane not infuscated, with yellow veins and microtrichia; cell br above vena spuria completely covered with microtrichia; costagium with yellow setae.
LEGS. Dark submedian ring on pro- and mesotibia weak and visible only ventrally, microtrichia on metatibia distinct in proximal half, dorsally; all tarsi yellow-orange, without shading; all setae of legs light yellow; tarsomere 1 of pro- and metaleg not swollen like in M. argenteus comb. nov.; tarsomere 1 of protarsus anterodorsally without a line of minute black spinules between the yellow trichia.
ABDOMEN (Figs 1, 7C). Tergites light yellow setose; tergites 2+3 with very large silver spots, covering most of the tergite’s width except for a narrow brown goblet–shaped median part; distance between silver spots on tergite 2 smaller, 0.19 × width of tergite; spots on tergite 3 not tapering towards the middle of tergite, but being more rounded; silver spots on tergites 2+3 covered with relatively long, dense, adpressed, yellow setae except antero-lateral corner; tergite 4 with two small indistinct microtrichiose spots near to anterior margin. Male genitalia in Figs 10C, 11C, 12C.
Distribution
Afrotropical – South Africa (Eastern Cape) (Fig. 15).
description: Published as part of Doczkal, Dieter, Radenković, Snežana, Lyneborg, Leif & Pape, Thomas, 2016, Taxonomic revision of the Afrotropical genus Megatrigon Johnson, 1898 (Diptera: Syrphidae), pp. 1-36 in European Journal of Taxonomy 238 on page 20, DOI: 10.5852/ejt.2016.238, http://zenodo.org/record/3849874