Eumerus lyneborgi Ricarte & Hauser & Kinnee & Marcos-García 2020, sp. nov.
Creators: name: Ricarte, Antonio
name: Hauser, Martin
name: Kinnee, Scott
name: Marcos-García, Ángeles
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Eumerus
Eumerus lyneborgi

description: Eumerus lyneborgi Ricarte & Hauser, sp. nov.
Figs 2–8
Material examined. Holotype: 1³, Namibia, Windhoek, Jardín Botánico (‘ Botanical Garden’), 27.xi.2018, en (‘hovering around’) Cyphostemma sp (Vitaceae), leg. E. Galante [CEUA] [MN717173]. Paratypes: 2♀, Namibia, Windhoek, Jardín Botánico (‘Botanical Garden’), 27.xi.2018, en (‘hovering around’) Cyphostemma sp (Vitaceae), leg. E. Galante [CEUA] [MN717174]; 1³, Willowmore, Capland, Dr. Brauns (printed label) / A L Melander Collection 1961 (printed white & green label) / HOLOTYPE ³ ‘ Eumerus thompsoni’ Lyneborg det. 2006 (printed orange label) / USNMENT 01477958 (printed label with barcode) / PARATYPE Eumerus lyneborgi (printed yellow label) [USNM]; 1³, S AFRICA: OFS x 5, SW of Paul Roux, 28 18’S: 27 27’E, 1700m, Date 11.iii.1991, Londt & Whittington, Rocky hill & farmland (printed label) / NMSA-DIP 55489/ PARATYPE ³ ‘ Eumerus thomp- soni’ Lyneborg det. 2006 (printed yellow label) [NMSA]; 2³, NAMIBIA, Windhoek, National botanical Gardens, -22.5725, 17.0945, 29.XI.2018, A.D. Young [CSCA, CNC] [MN717168]; 1³, S Africa Eastern Cape, Graaff-Reinet 760m, Urquhart Caravan Park, 32º14’16”S 24º31’42”E, 26–28.x.2004, J&A Londt, Succulent rocky slopes / DNARMCA, K. Jordaens 2014 114D07 / NMSA-DIP 65122 [NMSA]; 1³, RSA: Free State, Brandfort, Florisbad Res. Stat. 28º46.039’S 26º0.4234’E, 17–20.ix.2012, A.H. Kirk-Spriggs / Eumerus sp. det. Kurt Jordaens & M. De Meyer / DNA 110E01 K. Jordaens RMCA 2014 / BMSA(D) 36795 / Malaise traps, Acacia savanna / Entomology Dept. National Museum P.O. Box 266 Bloemfontein 9300 South Africa (printed in blue label) [BMSA].
The holotype lacks the left mesoleg and metaleg (used for DNA analysis) and has its genitalia stored in a plastic microvial. One of the two CEUA paratypes lack the left proleg, left metaleg, and right mesoleg (all used for DNA analysis), and it is partly covered in fungus hyphae. The specimen from RSA (110E01) was sequenced by Kurt Jordaens (RMCA; currently unpublished) who shared the COI sequence with us. The sequence is identical with ours.
Diagnosis. Small to medium size species (7.5–9 mm, n = 3); eye pilose (Fig. 2); in male, frontal triangle 1.7× longer than eye contiguity; basoflagellomere convex dorsally, straight ventrally (Fig. 2), 1.4–1.5× longer than wide (n = 2); metafemur swollen; metatarsomeres 2 and 3 with a long spur-like expansion posteriorly, less conspicuous in metatarsomere 3 of female (Fig. 3); tergum IV orange posteriorly (orange part sometimes obscured by pollinosity); terga II–IV each with a pollinose fascia posteriorly and a pair of diagonal markings sometimes narrowly connected with the posterior pollinosity (terga II and IV), and approaching each other on the tergum anterior margin (Figs 4, 6A); sterna-IV posterior margin with two roundish expansions leaving a concave region centrally; male genitalia (Fig. 7) with different sets of various-sizes black spinae on the inner side of the surstylus (Figs 8A, B).
Description —Male (holotype). L = 8.5 mm, WL = 5.4 mm. Head (Figs 2, 4). Eye pilose except for posterior margin and near eye contiguity; eye pile white except for some dark brown pile intermixed dorsally; facets near eye contiguity larger than those in the posterior part of eye; eye contiguity 8-facets or 0.25 mm long; vertical triangle black, pollinose and with long erect black pile intermixed with some light red posteriorly; ocellar triangle isosceles, pollinosity absent from the areas surrounding the ocelli; occiput black, with denser pollinosity on eye margin; occiput pile light red, turning to white from the middle of the occiput to the gena; frontal triangle 1.7× longer than eye contiguity; frontal triangle (including lunules) and face white pollinose, with long white pile; gena black, with white pollinosity; antenna white pollinose, but more sparsely than that of frontal triangle and then the background colour of antenna visible; scape and pedicel black, but pedicel turning to brown at its apex; pedicel black pilose dorsally, white pilose ventrally; basoflagellomere black, except for baso-ventral brown area; basoflagellomere convex dorsally, straight ventrally, and pointing apically; basal third of antennal arista brown, the reminder black; basoflagellomere 1.4× longer than wide. Thorax (Figs 3, 4). Scutum, scutellum, and pleuron black, postpronotum slightly orange; scutum white pollinose laterally and anteriorly, with a medial and two thinner pollinose white vittae at each side of the medial vitta, the lateral vittae crossed by a thin line of pollinosity from the transverse suture to the inner lateral vitta; posterior margin of scutum and scutellum with metallic greenish reflections; scutum black pilose, with pale pile intermixed on anterior and posterior margins, notopleuron, and postalar callus; posterior anepisternum, anepimeron and dorsal part of katepisternum with long white to light-brown pile and densely greyish-white pollinose; scutellum densely greyish-white pollinose on its anterior and posterior margins; scutellum mainly light-brown pilose, with some long black pile intermixed posteriorly; longest scutellum pile over 0.4 mm long; legs black, except for the red to reddish black apices of femora, basis of tibiae, posterior side of metatibia, and protarsomeres 3–4, and meso- and metatarsomeres 5 dorsally; posterior sides of pro- and mesofemora densely greyish-white pollinose and mainly with white to light-yellow pile; metafemur conspicuously swollen (2.8× longer than wide at its maximum width), dorsally greyish-white pollinose, with long white pile dorsally and ventrally; preapical antero-ventral flange of metafemur provided with 11 spinae, postero-ventral flange with nine spinae; apical two thirds of metatibia swollen; metatibia red to reddish black on the posterior side, along its entire length; metabasotarsomere simple, somewhat flattened; metatarsomeres 2 and 3 each, with a long spur-like expansion posteriorly; wing extensively microtrichose, alula bare anteriorly; calypter light yellow, with long light-yellow pile marginally; halter light yellow. Abdomen (Fig. 4). Terga II–III black, with posterior margins narrowly and inconspicuously red; tergum IV black, with a semicircular orange area posteriorly; terga I–IV covered in sparse pollinosity, which is denser on the posterior margins of terga II–IV and the lateral margins of terga III and IV; terga II–IV each with a pair of diagonal vittae of dense white (greyish on tergum IV) pollinosity with their outer ends connecting with the lateral and posterior pollinose areas and their inner ends approaching each other at the midpoint of each tergum anterior margin (tergum III with diagonal markings slightly separated from the posterior and lateral pollinose areas); dense markings of pollinosity on terga coarsely punctuated; terga II–IV with light red pile, except for the black-pilose areas with sparser pollinosity; sterna brown, blackish centrally, with long light-brown pile; sterna-IV posterior margin with two roundish expansions leaving a concave region centrally (Fig. 5). Genitalia (Figs 7, 8). Very distinctive, with different sets of various-sizes black spinae on the inner side of the surstylus (Figs 8A, B); anterior lobe of surstylus forming an arm with processes bearing setulae (Figs 7, 8A); hypandrium with a branched process basally (Figs 7, 8D).
Female (Figs 2B, 3B, 6). Same as the male except for the following characters: frons greyish-white pollinose, more sparsely near lunules, besides of the clearer areas surrounding the ocelli; frons, on the area anterior to ocellar triangle, with reddish white pile; lunules red; metafemur with 10–14 spinae on the anterior preapical antero-ventral flange; expansion of metatarsomere 3 less developed than in male; tergum II–III entirely black (Fig. 6); posterior margin of tergum IV inconspicuously red; sternum IV simple in its posterior margin, somewhat excavated centrally.
Etymology. This species is named after Leif Lyneborg who contributed greatly to knowledge of Afrotropical Eumerus, and left behind an important manuscript key to the Afrotropical species of Eumerus including the one here described. The specific epithet ‘ lyneborgi ’ should be treated as a noun in the genitive case Distribution. Namibia, South Africa.
description: Published as part of Ricarte, Antonio, Hauser, Martin, Kinnee, Scott & Marcos-García, Ángeles, 2020, A new Eumerus hoverfly (Diptera: Syrphidae) from Namibia and South Africa with notes on similar species, pp. 493-508 in Zootaxa 4890 (4) on pages 495-502, DOI: 10.11646/zootaxa.4890.4.3, http://zenodo.org/record/4306501