Megatrigon argentifrons, Doczkal & Radenković & Lyneborg & Pape, 2016
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publication ID |
https://doi.org/ 10.5852/ejt.2016.238 |
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DOI |
https://doi.org/10.5281/zenodo.3854662 |
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persistent identifier |
https://treatment.plazi.org/id/03EA327E-FFEE-EC18-FDC9-EB7AFBE3F816 |
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treatment provided by |
Valdenar |
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scientific name |
Megatrigon argentifrons |
| status |
sp. nov. |
Megatrigon argentifrons View in CoL sp. nov.
urn:lsid:zoobank.org:act:CCF520E8-EBFC-4269-956E-C5E31E92DF3F
Figs 1B View Fig , 2B View Fig , 3B View Fig , 6 View Fig A–B, 7B, 10B, 11B, 12B, 15
Diagnosis
Frons covered with very dense, long, silvery-white setae and microtrichia; on vertex microtrichia present anteriorly, along lateral sides of ocellar triangle and as small, but distinct postocellar spots ( Fig. 2B View Fig ).
Etymology
The species epithet, which should be treated as a noun in apposition, is derived from the Latin words argentum (= silver) and frons (= forehead), alluding to the dense, silvery microtrichiae that completely cover the frons.
Type material
Holotype SOUTH AFRICA: ♂, Western Cape, Stellenbosch, 8 Oct. 1926, Dr. H. Brauns leg. ( RMNH).
Paratypes SOUTH AFRICA: 1 ♂, Western Cape, Uniondale Distr., Bo Kouga , Mar. 1954, museum staff leg. ( SAMC); 1 ♂, KwaZulu-Natal, Bushmans Nek , 2929cc, slopes above hotel , 16 Nov. 1981, J.G.H. Londt leg. ( NMSA).
Description
LENGTH. Body 7.0 mm, wing 5.0 mm.
HEAD ( Figs 2B View Fig , 3B View Fig ). Lateral margins of face more parallel while in M. argenteus comb. nov. slightly divergent; distance between eyes larger than in M. argenteus comb. nov., 0.19 × width of head; ocellar triangle eqilateral, without median longitudinal groove; on face microtrichiose stripes along eye margin wide at the level of antennae, but tapering and reduced at lower part, connected with microtrichia below antenna by tiny oblique microtrichiose line; median facial stripe well developed; microtrichia on postocular orbit do not exceed post-ocular ridge.
THORAX. Mesoscutum with two lateral microtrichiose stripes and two submedian microtrichiose stripes ending well behind level of transverse suture; supra-alar setae yellow; microtrichia on mediotergite medially occupied more than 0.5 of width.
WING. Membrane not infuscated, with light brown veins, microtrichia brown; cell br above vena spuria narrowly bare; costagium with yellow setae.
LEGS ( Fig. 6 View Fig A–B). Setae on legs white without black ones; tarsomere 1 of metatarsus darkened dorsally, but without black setae intermingled with light ones.
ABDOMEN ( Figs 1B View Fig , 7B View Fig ). Tergites 2+3 with large silver spots, touching lateral and posterior margins of tergites, and almost anterior corner; tergite 3 is 2.2 × as wide as long (wider than in the closely related species M. natalensis sp. nov.); distance between silver spots on tergite 3 large, 0.22 × as wide as tergite (larger than in M. natalensis sp. nov.); tergites, especially black parts (median part of tergites 2+3 and whole tergite 4) covered with short, adpressed white-yellow setae (in M. natalensis sp. nov. longer and intensively yellow); silver spots on tergite 3 with reduced setae (contrary to M. natalensis sp. nov.); tergite 4 without microtrichiose spots. Male genitalia in Figs 10B View Fig , 11B View Fig , 12B View Fig .
Distribution
Afrotropical – South Africa (Western Cape and KwaZulu-Natal) ( Fig. 15 View Fig ).
| RMNH |
Netherlands, Leiden, Nationaal Natuurhistorische Museum ("Naturalis") [formerly Rijksmuseum van Natuurlijke Historie] |
| SAMC |
South Africa, Cape Town, Iziko Museum of Capetown (formerly South African Museum) |
| NMSA |
South Africa, Kwa-Zulu Natal, Pietermaritzburg, Natal Museum |
| RMNH |
National Museum of Natural History, Naturalis |
| SAMC |
Iziko Museums of Cape Town |
| NMSA |
KwaZulu-Natal Museum |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Order |
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SubFamily |
Eristalinae |
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Tribe |
Merodontini |
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