Megatrigon cooksoni, 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 : 25-26

publication ID	https://doi.org/ 10.5852/ejt.2016.238
DOI	https://doi.org/10.5281/zenodo.3854656
persistent identifier	https://treatment.plazi.org/id/03EA327E-FFF9-EC0E-FDF3-EB91FD99FEAB
treatment provided by	Valdenar
scientific name	Megatrigon cooksoni
status	sp. nov.

Treatment

Megatrigon cooksoni View in CoL sp. nov.

urn:lsid:zoobank.org:act:3E26326F-E773-4EAC-8AC0-97B569743463

Figs 1H View Fig , 2I View Fig , 3H View Fig , 5B View Fig , 7H View Fig , 10H View Fig , 11H View Fig , 12G View Fig , 16 View Fig

Diagnosis

Black species with white, connected microtrichiose fasciae on tergites ( Figs 1H View Fig , 7H View Fig ) and bicoloured wing resulting from dense microtrichia, white in proximal 0.6 and brown in distal 0.4 ( Fig. 5B View Fig ). Frons shiny; vertex and post-ocular orbit white microtrichiose except area between posterior ocelli, medioposterior part, spots at eye corner and posterior dorsal margin of head ( Fig. 2I View Fig ).

Etymology

The species epithet, which is formed as a male genitive, is derived from the personal name of the collector, Mr. Daniel Montague Cookson.

Type material

Holotype ZIMBABWE: ♂, N. Vumba , 6,000 ft, 16 Jan. 1966, D. Cookson leg. ( NMSA).

Paratypes ZIMBABWE: 2 ♂♂, same locality as holotype, 21 Feb. 1965, D. Cookson leg. ( NMSA).

Description

LENGTH. Body 10.0 mm, wing 7.0 mm.

HEAD ( Figs 2I View Fig , 3H View Fig ). Distance between eyes, 0.17 × width of head; width of vertical triangle 0.26–0.29 × width of head; postocular orbit wider, the width of postocular orbit dorsally 0.13 × as wide as head; ocellar triangle equilateral, without median longitudinal groove; microtrichia on face well developed and similar to M. ochreatus comb. nov.: white microtrichiose stripes along eye margin distinct, connected with wide median microtrichiose facial stripe below antennae by narrow oblique stripe.

THORAX. Mesoscutum with lateral microtrichiose stripes wide and long, posteriorly connected with scarce prescutellar microtrichia; indistinct submedian stripes ending at conspicuous microtrichiose spots on transverse sutures; traces of median stripe ending near the level of transverse suture; supra-alar setae yellow; mediotergite almost entirely covered by microtrichia.

WING ( Fig. 5B View Fig ). Setae on costagium white; veins brown; capitulum brown.

LEGS. Only apex of pro- and mesofemur pale, not the base; tarsi yellow, only tarsomere 1 of metaleg brown dorsally; metatibia dorsally with white microtrichia in proximal half that reach the scar.

ABDOMEN ( Figs 1H View Fig , 7H View Fig ). Tergites 2–4 black with white transversal microtrichiose fasciae connected medially, on tergites 2+3 touching lateral margins, while on tergite 4 widely separated from them; fasciae on tergites 2+3 oblique and on tergite 4 more straight; tergite 2 with inconspicuous white microtrichia anteromedially, tergite 4 with wide microtrichiose posterior margin. Male genitalia in Figs 10H View Fig , 11H View Fig , 12G View Fig .

Distribution

Afrotropical – Zimbabwe ( Fig. 16 View Fig ).