Megatrigon natalensis, 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 : 22-23

publication ID	https://doi.org/ 10.5852/ejt.2016.238
DOI	https://doi.org/10.5281/zenodo.3854652
persistent identifier	https://treatment.plazi.org/id/03EA327E-FFF4-EC01-FDFB-EB0AFC8FFEAB
treatment provided by	Valdenar
scientific name	Megatrigon natalensis
status	sp. nov.

Treatment

Megatrigon natalensis View in CoL sp. nov.

urn:lsid:zoobank.org:act:38554033-102B-4F8D-BD69-327270AD2A4D

Figs 1E View Fig , 2 View Fig E–F, 3E, 4B, 7E, 10E, 11E, 12E, 15

Diagnosis

Very similar to M. argentifrons sp. nov. except following characteristics: postocellar spots larger than in argentifrons sp. nov. and almost joined at posteromedian part of vertex ( Fig. 2F View Fig ); on face microtrichiose stripes along eye margin and median facial stripe very reduced, present only as a tiny line but on the whole length; setae on vertex more dense and intensively yellow, and on the frons also yellow, not silvery-white like in M. argentifrons sp. nov. ( Fig. 2E View Fig ); microtrichia on mesoscutum reduced to traces of lateral and submedian stripes ( Fig. 4B View Fig ).

Etymology

The species epithet, which is formed as a geographical genitive, is derived from the name of the province in South Africa, KwaZulu-Natal, from where the type series of this species originate, i.e., the type locality.

Type material

Holotype SOUTH AFRICA: ♂, KwaZulu-Natal, Bushmans Nek, 2929cc, slopes above hotel , 16 Nov. 1981, J.G.H. Londt leg. ( NMSA).

Paratypes SOUTH AFRICA: 2 ♂♂, same data as holotype .

Description

LENGTH. Body 6.5 mm, wing 4.5 mm.

HEAD ( Figs 2E View Fig , 3E View Fig ). Distance between eyes relatively large, 0.20–0.21 × width of head, larger than in M. argenteus comb. nov., but similar to M. argentifrons sp. nov.; post-ocular orbit narrow, but slightly wider than in M. argenteus comb. nov., 0.10 × width of head; ocellar triangle eqilateral, without median longitudinal groove; postpedicel ( Fig. 3E View Fig ) similar to M. argenteus comb. nov., but pedicel is relatively short (postpedicel 2 × as long as pedicel).

THORAX ( Fig. 4B View Fig ). Microtrichia on mesoscutum reduced so that only traces remain of the submedian and lateral microtrichiose stripes.

WING. Almost entirely covered by microtrichia, only few microtrichia missing in cell br basally, and above vena spuria.

LEGS. Tarsi orange-brown, only tarsomere 1 of metaleg darkened dorsally.

ABDOMEN ( Figs 1 View Fig , 7E View Fig ). Setae on tergites yellow-gold; abdomen more narrow (tergite 3 is 1.9 × as wide as long) than in M. argenteus comb. nov.; silver spots on tergites 2+3 are 1.20–1.25 as long as wide; silver spots on tergite 3 partly covered with setae, especially near to median part of tergites (in M. argentifrons sp. nov. setae are very reduced); tergite 4 without microtrichiose spots. Male genitalia in Figs 10E View Fig , 11E View Fig , 12E View Fig .