Duilius tenuis Stål, 1858

Huang, Min & Holzinger, Werner E., 2010, Cixiidae (Hemiptera: Fulgoromorpha) from Namibia, with records from neighbouring countries, Zootaxa 2717, pp. 34-52 : 35

Duilius tenuis Stål, 1858

Figs 1 , 14–21

Duilius tenuis Stål, 1858: 319 (Type locality: "Territorium fluvii Svakop Africae meridionalis occidentalis")

Material examined. 4 males 8 females, Namibia, Brandberg, dry river bed near "White Lady" (21°05’S, 14°39’E), on Tamarix usneoides , 22.ii.2000 (W. and I. Holzinger) ( OEKO); several additional specimens from 3 mls E Swakopmund, 30.i.1972, and nr. Onseepkans, Orange River banks, 8–10.i.1972, kept in The Natural History Museum, London, and in the Institut Royal des Sciences Naturelles de Belgique, Département d’Entomologie.

Description. Small cixiids, about 3.6 mm in length, with cylindrical body. Wings in resting position flat, rooflike. Ground colour of body yellowish to orange dorsally and ochraceous ventrally.

Vertex longer than broad, narrowing towards frons, with median carina reaching posterior margin. Junction of vertex and frons distinct, roundish. Face trapezoid, flat, ivory-coloured. Frons widening towards clypeus, its widest part immediately above the clypeus. Median carina cranially distinct, vanishing towards frontoclypeal suture. Frontoclypeal suture curved. Median ocellus not visible.

Pronotum small, caudal border with obtuse angle. Mesonotum with three longitudinal keels. Fore wings long, with brown setiferous tubercles along veins. Wing venation as shown in Fig. 21 . Legs medium-sized, greenish, tibial spines with dark tips; tarsi with 5+5 apical spines.

Male genitalia as in Figs 14–20 : Genital segment slightly asymmetrical, left side broader and shallowly concave. Basal part of aedeagus with one movable spine originating on the right side, then curved cephalo-left and directed ventro-right apically. Flagellum with a thin spine at the apex. Genital styles spoon-shaped, almost symmetrical. Shafts narrowed at midlength, with expanded apex broad and equal to half of the length of each shaft. Anal segment long, symmetrical in lateral view, with stunted finger-like processes at midlength of lateral margin.

Distribution. Only known from Namibia, probably endemic.

Ecology. Obviously monophagous on Tamarix usneoides E. Meyer ex Bunge ; this tree is the only indigenous tamarisk in southern Africa and distributed “along brackish shore lines, river banks and in dry river beds” ( Coates Palgrave 2002).

Figures

FIGURES 1 – 13. Habitus photographs, dorsolateral view. 1. Duilius tenuis, female; 2. Pentastiridius moestus, male; 3. P. sudanicus, male; 4. P. limbifer, male; 5. Eumecurus incompletus, male; 6 E. kibuyanus, male; 7. E. decempunctatus, male; 8. E. mashonanus, male; 9. E. brachycephalus, male; 10. Atonurus meridianus, male; 11. E. hottentottus, female; 12. A. namibianus, male; 13. E. eryx, female. Scale bar A = 1 mm for figs 1 – 6, scale bar B = 1 mm for figs 7 – 13.

FIGURES 14 – 21. Duilius tenuis. 14. male genitalia from the left; 15. aedeagus, dorsal view; 16. same, right lateral view; 17. ventromedian process of the male genital segment; 18. male genital segment from the right; 19. male anal tube, ventral view; 20. male genital styles, inner maximum view; 21. habitus, dorsal view [specimen from Brandberg].