Megatrigon magnicornis, Doczkal & Radenković & Lyneborg & Pape, 2016

Doczkal, Dieter, Radenković, Snežana, Lyneborg, Leif & Pape, Thomas, 2016, Taxonomic revision of the Afrotropical genus Megatrigon Johnson, 1898 (Diptera: Syrphidae), European Journal of Taxonomy 238, pp. 1-36 : 21-22

publication ID	https://doi.org/ 10.5852/ejt.2016.238
DOI	https://doi.org/10.5281/zenodo.3854660
persistent identifier	https://treatment.plazi.org/id/03EA327E-FFF5-EC02-FDC9-EB7AFCEBFEAB
treatment provided by	Valdenar
scientific name	Megatrigon magnicornis
status	sp. nov.

Treatment

Megatrigon magnicornis View in CoL sp. nov.

urn:lsid:zoobank.org:act:DA2E127C-C16A-4ED5-BAAE-5C16FC9DA535

Figs 1D View Fig , 2D View Fig , 3D View Fig , 4A View Fig , 6C View Fig , 7D View Fig , 10D View Fig , 11D View Fig , 12D View Fig , 13D View Fig , 15 View Fig

Diagnosis

Antennae long, postpedicel very long ( Fig. 3D View Fig ), 1.9–2.2 × as long as deep, 2.4–2.75 as long as pedicel; tergites 2+3 ( Fig. 7D View Fig ) with small silver spots (not reaching margins of tergite, except sometimes in tergite 3) largely separated (distance between silver spots on tergites 2+3 large, 0.45–0.50 × as wide as tergite); silver spots on tergite 3 with scattered black and white setae.

Etymology

The species epithet, which is formed as an adjective, is derived from the Latin words magnus (= large) and cornus (= horn), alluding to the long antennae.

Type material

Holotype

SOUTH AFRICA: ♁, Eastern Cape, Goshen nr. Cathcart , Mar. 1954, museum staff leg. ( SAMC).

Paratypes

SOUTH AFRICA: 2 ♁♁, 1 ♀, Eastern Cape, Goshen nr. Cathcart, Mar. 1954, museum staff leg. ( SAMC); 1 ♁, Eastern Cape, Boesmansriviermond, 27–31 Dec. 1985, J. Londt leg. ( NMSA); 1 ♀, Eastern Cape, Grahamstown, 29 Oct. 1959, D.J. Greathead leg. ( BMNH); 1 ♀, Eastern Cape, Grahamstown, Apr. 1963, Miss M. Daly & Miss M. Sole leg. ( AMGS).

Description

LENGTH. Body 10 mm, wing 6.5–7.0 mm.

HEAD ( Figs 2D View Fig , 3D View Fig ). Upper part of face across the whole width, at the level and below antennae, completely covered with microtrichia, thereby microtrichiose stripes along eye margin and median facial stripe connected at that level; frons and vertex shiny (only few microtrichia in the middle of frons, anterior and lateral to anterior ocella), without postocellar spots or with very few microtrichia; microtrichia on post-ocular orbit do not exceed post-ocular ridge; length of post-ocular orbit large, 0.11– 0.13 × width of head; distance between eyes large, 0.21–0.23 width of head; ocellar triangle equilateral and without median groove.

THORAX ( Fig. 4A View Fig ). Mesoscutum with two wide, distinct, long, lateral microtrichiose stripes, two long submedian microtrichiose stripes ending far beyond level of transverse suture, and weak prescutellar microtrichia; supra-alar setae yellow; median about 0.5 of width of mediotergite covered by microtrichia.

WING. Membrane not infuscated, veins and microtrichia light brown, cell br above vena spuria almost all covered with microtrichia; costagium with yellow setae.

LEGS ( Fig. 6C View Fig ). Setae on legs all yellow; pro- and mesotibia with indistinct dark submedian ring; all tarsi yellow.

ABDOMEN ( Figs 1D View Fig , 7D View Fig ). Tergites 2+3 and posterior margin of tergite 4 brown-yellow with black alveoli, setae on tergites short, yellow and in some parts black: posterior 0.25 of tergite 2, submedian and posterior part of tergite 3; tergite 2 medially covered with white microtrichia, tergite 3 with tiny microtrichiose line extended from anterior margin to the centre of tergite, tergite 4 without microtrichiose spots. Male genitalia in Figs 10D View Fig , 11D View Fig , 12D View Fig .

Distribution

Afrotropical – South Africa (Eastern Cape) ( Fig. 15 View Fig ).