Vilargus Theron 1975
Creators: name: Stiller, M.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadellidae
Vilargus

description: Key to males of species of Vilargus (females, where known, included).   
1. Aedeagus with spine arising ventrally (Figs 36, 44, 69, 87) or laterally (Figs 53, 93, 96–98, 105) from base of shaft or from preatrium; plate with rectangular posterior protrusion (Fig. 56), or if without protrusion then truncate (Figs 90, 108), acutely triangular (Fig. 99) or broadly rounded (Figs 39, 47, 72, 73)........................................................... 2  
 - Aedeagus without spine arising from base of shaft, but with apex expanded (Figs 60, 61), gonopore laterally on one side of apex; apex of plate with narrow, short rounded protrusion (Fig. 64); [style (Fig. 63), pygofer (Fig. 66); connective (Fig. 62); female sternite 7 (Fig. 67)]....................................................................... Vilargus lobulicans sp. n.   
2. Aedeagal preatrium with long, pointed paraphysis (e.g. Figs 44, 69).......................................................................... 3  
- Aedeagal preatrium without paraphysis, but with shaft with basal or lateral process (e.g. Figs 36, 52, 87, 92, 96, 104)...................................................................................................................................................................................... 4  
 3. Aedeagus with preatrium acutely angled to paraphysis (Fig. 44); apex of aedeagal shaft almost reaching apex of paraphysis (Figs 43, 44); paraphysis symmetrical (Figs 43, 44, 47); pygofer with posterior dorsal and ventral angles rectangular (Fig. 49); apophysis of style sometimes extending slightly beyond posterior margin of plate (Fig. 47); female sternite 7 variable, with shallow or deep raised notch flanked by variably long lobes (Figs 50, 51)............................................................................................................................................................ Vilargus budenticans sp. n.   
 - Aedeagus with preatrium right-angled to paraphysis (Fig. 69); apex of aedeagal shaft reaching half-way into paraphysis (Figs 68, 69); paraphysis asymmetrical (Figs 68, 69, 72, 73), with lateromedial margin produced dorsally; pygofer with dorsoposterior margin with subapical triangular lobe (Fig. 74); apophysis of style not extending beyond posterior margin of plate (Figs 72, 73); female sternite 7 notched (Figs 77–79) ............. Vilargus pumilicans (Naudé)   
4. Plate rectangular, medial, posterior and lateral margins more or less right-angled (Figs 90, 108).............................. 5  
- Plate variable, acutely triangular (Fig. 99), broadly rounded (Fig. 39) or somewhat triangular with narrow truncated apex (Fig. 56)................................................................................................................................................................ 6  
 5. Aedeagal shaft in dorsal view arising on midline from atrium (Fig. 86), short, narrow, pointed process arising ventrolaterally subbasally from shaft (Fig. 87), process about half as long as length of shaft; style (Fig. 89); connective (Fig. 88); pygofer (Fig. 91); [female unknown] ...................................................................... Vilargus simulans sp. n.   
 - Aedeagal shaft in dorsal view arising laterad of midline from atrium (Fig. 104), with parallel-sided process arising from opposite side of atrium (Fig. 104), process with apex expanded, up to two times as long as length of shaft (Fig. 105); style (Fig. 107); connective (Fig. 106); pygofer (Fig. 110); [female sternite 7 (Figs 111–115)] ..................................................................................................................................................................... Vilargus trunculicans sp. n.   
 6. Plate acutely triangular, medial and lateral margins straight, convergent (Fig. 99), plate laterally with apex curved or angled dorsad; aedeagus with process parallel-sided, about as long as shaft or half as long as shaft (Figs 92, 93, 96– 98); style (Fig. 95); connective (Fig. 94); pygofer (Fig. 101, 102); female sternite 7 with short, blunt ligula (Fig. 103) ........................................................................................................................................... Vilargus triquetricans sp. n.   
- Plate variable, broadly rounded (Fig. 39) or somewhat triangular basally with narrow truncated apex (Fig. 56)....... 7  
 7. Plate posterior margin broadly rounded (Fig. 39); aedeagal shaft with process arising ventrolaterally from base of shaft uniformly tapered, larger than shaft, extending posteriad of shaft (Figs 35, 36); style with dorsal apophysis about 2.5 times longer medially than width across apex, anterior medial lobe short, angle acutely to base (Fig. 38); connective with stem slightly wider than its length and wider the width across arms (Fig. 36); female sternite 7 with narrow, deep U-shaped notch (Fig. 42) ............................................................................... Vilargus bicornicans sp. n.   
 - Plate basally triangular, caudally apex narrow, truncated (Fig. 56); aedeagal process narrowly triangular, laterobasal, one third as long as length of shaft (Figs 52, 53); style with dorsal apophysis about 3.6 times longer medially than width across apex, anterior medial lobe long, right angled to base (Fig. 55); connective with stem about as long as wide and narrower that width across arms (Fig. 54); female sternite 7 with narrow, V-shaped notch (Fig. 59)............ ............................................................................................................................................ Vilargus dentulicans sp. n.
description: Published as part of Stiller, M., 2010, Revision of Vilargus Theron (Hemiptera: Cicadellidae: Deltocephalinae) from South Africa, pp. 1-25 in Zootaxa 2674 (1) on page 4, DOI: 10.11646/zootaxa.2468.1.1, http://zenodo.org/record/5301672