Eumerus obliquus
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 obliquus

description: Key to the African species of the Eumerus obliquus group
The Eumerus obliquus group as defined in the discussion includes E. incilis Smit in Smit et al. (2017), E. lyneborgi sp. nov., E. obliquus, E. unicolor Loew, 1858 [= E. wainwrighti (Curran, 1938)] and E. vestitus.
1. Face below antennae polished black, without pollinosity; scutum shiny, without a pattern of pollinose markings or only with a faint vestigial pattern; tarsomeres 4 and 5 of all legs black, contrasting conspicuously with the reddish brown tarsomeres 1‾3; male eyes separated by a distance equalling the width of the anterior ocellus.............................. E. unicolor
- Face below antennae always pollinose; scutum with a conspicuous pattern of pollinose markings, more reduced but still conspicuous in E. incilis [see figure 39 and 40 in Smit et al. (2017)]; tarsi of all legs either uniform in colour or with a dark gradient towards the apex; male eyes holoptic...................................................................... 2
2. Metatarsomere 2 with a conspicuous apical extension (Fig. 3A, B); male metabasotarsomere unmodified.................................................................................................... E. lyneborgi sp. nov.
- Metatarsomere 2 without apical extensions; male metabasotarsomere strongly modified in most species, simple in E. punctifrons ............................................................................................... 3
3 Metatibia with 2‾3 short black apical spinae (Fig. 11A); posterior half of tergum IV extensively pollinose............... 4
- Metatibia without apical spinae (Fig. 11B); tergum IV shiny between the two diagonal pollinose vittae and the posterior margin of tergum............................................................................................ 5
4 Eye with short sparse pile; metabasotarsomere brown (Fig. 9B) and, in male, with a small basal tooth in the sulcus [see figure 30 in Smit et al. (2017)]......................................................................... E. vestitus
- Eye usually bare; metabasotarsomere black and, in male, without teeth in the dorsal sulcus [see figure 27 in Smit et al. (2017)]....................................................................................... E. incilis
5 Vertex with black pile and extensive areas free of pollinosity or sparsely pollinose [see figure 4A in Garcete-Barrett et al. (2020)]; male metabasotarsomere laterally compressed, with a dorsal ridge [see figure 4E in Garcete-Barrett et al. (2020)].............................................................................................. E. obliquus
- Vertex without black pile, covered in dense pollinosity except for a narrow area surrounding each ocellus [see figure 57 in Smit et al. (2017)]; male metabasotarsomere without ridge.............................................. E. punctifrons
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 page 503, DOI: 10.11646/zootaxa.4890.4.3, http://zenodo.org/record/4306501