Pravistylus longitrunculus, Stiller, 2010

Stiller, M., 2010, Revision of the Southern African leafhopper genus Pravistylus (Hemiptera, Cicadellidae, Deltocephalinae) 2468, Zootaxa 2468 (1), pp. 1-81: 26-27

publication ID

http://doi.org/ 10.11646/zootaxa.2468.1.1

persistent identifier

http://treatment.plazi.org/id/03EFD356-FFC2-FFC8-6CFF-73DF8844D799

treatment provided by

Felipe

scientific name

Pravistylus longitrunculus
status

sp. n.

Pravistylus longitrunculus   sp. n.

( Figs 1 p; 2 k; 3 ab; 4 z; 5 e; 6 z; 7 al–ao; 8 ab–ad)

Diagnosis. Plate elongate, tapering to narrow, truncate apex; plate 1.7–1.9 times as long as wide; plate apex directed dorsoposteriad or posteriad, only reaching margin of pygofer lobes, sometimes inserted shallowly into genital capsule; macrosetae extending from midlength to near apex ( Fig. 2 k); similar to that of P. scolopygeus   sp. n. ( Fig. 2 l). Pygofer lobe elongate, apex rounded, without appendage on median surface ( Fig. 1 p). Aedeagus, ventral view, dorsal apodeme wide, rounded ( Fig. 4 z). Style distal part close to base ( Fig. 5 e). Sternite 7 base rectangular, ligula as long as or longer than the basal length ( Figs 7 al–ao).

Etymology. Latin, long (longulus) and truncated (trunculus) for the elongate plate with the square, and narrow apex.

Male and female. Ochraceous. Sometimes with small fuscous markings on vertex, inner anteapical and posterior discal cells of tegmina ( Fig. 8 ab (submacropter, Longtom Pass); Fig. 8 ac (brachypter, Malidyke Reserve); Fig. 8 ad (submacropter, with fuscous markings on tegmina, Mariepskop)).

Male. Dimensions. (n = 100) Length: apex of vertex to apex of tegmina 2.5–2.8 mm; apex of vertex to apex of abdomen 2.9–3.3 mm; vertex medially 0.5 mm; vertex next to eye 0.3 mm; pronotum medially 0.3– 0.4 mm. Width: head 0.9–1.0 mm; pronotum 0.8–0.9 mm. Ocellar diameter 25.8–30.2 µm; ocellocular distance 41.2–58.8 µm.

Genital capsule. Pygofer elongate; ventral posterior margin with right-angled lobe ( Fig. 1 p). Pygofer lobe variable: dorsal margin horizontal, ventral margin angled dorsally ( Fig. 1 p, Mauchsberg and Longtom specimens); dorsal margin angled ventrally, ventral margin horizontal (Graskop, Malidyke and Mariepskop specimens). Commonly when lobe with horizontal ventral margin, then lobe margin recessed for insertion of plate apices. Lobe about three quarters as wide as width of pygofer. Plate, ventral view, elongate, distal half uniformly tapered, truncate apex; left and right plates often with unequal length; subbasal lateral margin sinuous, distal and proximal cluster of short setae; distal half 2–7 uniseriate macrosetae ( Fig. 2 k); plate 1.7– 1.9 times as long as wide; lateral view, apex curved dorsoposteriad or posteriad ( Fig. 1 p), apex of plate sometimes touching ventral margin of lobe, seldom inserted into genital capsule. Aedeagal shaft, in lateral view, arising from base of atrium; preatrium short, base C-shaped, apex straight, shaft narrow, parallel-sided; dorsal view, shaft parallel-sided, dorsal apodeme broadly rounded; gonopore elongate, apical, ventral, about one third as long as length of shaft ( Figs 3 ab, 4 z). Style distal part close to anterior medial lobe; apophysis digitate, straight, acutely angled with preapical lobe; situated near base of plate ( Fig. 5 e). Connective, in dorsal view, with stem Y-shaped, about one third as long as length of base; lateral view, straight ( Fig. 6 z).

Female. Dimensions. (n = 50) Length: apex of vertex to apex of tegmina 2.5–2.6 mm; apex of vertex to apex of abdomen 2.9–3.2 mm; vertex medially 0.5 mm; vertex next to eye 0.3–0.4 mm; pronotum medially 0.3 mm. Width: head 0.9–1.0 mm; pronotum 0.8–0.9 mm. Ocellar diameter 26.1–29.6 µm; ocellocular distance 37.5–51.0 µm.

Genitalia. Sternite 7 base rectangular; posterior margin with long ligula, as long as or longer than basal length; apex of ligula shallowly notched; with raised ridge on ventral surface, extending about half-way into base of sternite (specimens in Fig. 7 al (sinuous ligula); Fig. 7 am (triangular ligula), Fig. 7 an (elongate, narrowly triangular ligula); Fig. 7 ao (elongate ligula)).

Material examined. Holotype male. South Africa, Mpumalanga. Mariepskop summit, 24°32ʹS, 30°52ʹE, 1929 m, 11.ix.2005, DVac moribund grass Bromus cantharticus   , Eragrostis sp.   , Festuca costata   ( Poaceae   ), DVac short moribund grass ( SANC). Paratypes. 113♂, 57♀. Mpumalanga. 1♂, 1♀, Gibraltar near Penge, 24°15ʹS, 30°17ʹE, 30.iii.1991; 32♂, Longtom Pass, summit, 25°08ʹS, 30°32ʹE, 2100 m, 18.xii.2000, sweeping, short grass and forbs; 15♂, Mauchsberg Pass, transmitter tower, 25°10ʹS, 30°37ʹE, 1860 m, 3.vii.2003, DVac, grass and forbs, on E and W facing slopes of summit; 19♂, 20♀, same data as holotype; 7♂, 14♀, Graskop, outskirts, 24°56ʹS, 30°51ʹE, 1452 m, 11.xi.2005, DVac, moribund grass, dominant probably Eragrostis   , no inflorescence; 1♂, between Longtom Pass and Sabie, 25°08ʹS, 30°36ʹE, 2133 m, 13.xi.2005, DVac; 3♂, Longtom Pass, valley opposite summit of pass, 25°07ʹS, 30°37ʹE, 2101 m, 13.xi.2005, DVac, moribund grass and Festuca sp.   ; 17♂, 7♀, Malidyke Blue Swallow Reserve, 24°57ʹS, 30°59ʹE, 1367 m, 13.xi.2005, DVac, moribund grass in grassland rehabilitation, Themeda triandra   dominant; 22♂, 15♀, Mariepskop summit, 24º32ʹ35.68ʺS, 30º51ʹ58.63ʺE, 1910 m, 19–20.ii.2010, DVac short grass; all M. Stiller ( BMNH, INHS, SANC).

Remarks. Pravistylus longitrunculus   is distinguished only by the male, with the sternite 7 of the female indistinguishable from that of P. pollediscus   sp. n.

Other species with an elongate plate are P. mecistoplacus   sp. n., P. varicudiscus   sp. n., P. pollediscus   sp. n., P. digitidiscus   and P. odontiophallus   sp. n. In P. mecistoplacus   the plate is much longer, with the apex long and acute ( Fig. 2 b) and even more elongate in P. varicudiscus   ( Figs 1 aj & 2 a). In P. pollediscus   the apex is shorter and digitate ( Fig. 2 t). In P. digitidiscus   the plate has very few or commonly no macrosetae, with the apex very narrow and deeply inserted between the pygofer lobe margins ( Figs 1 h, 2 c). In P. odontiophallus   the plate is more variable, but with the apex digitate or uniformly triangular ( Figs 2 m & n). However, P. odontiophallus   has the apex of the aedeagal shaft with an asymmetrical lateral serration.

The collection locations of some specimens of P. longitrunculus   and P. pollediscus   overlap, and from these areas the females of these species cannot be distinguished. This concerns specimens from Longtom Pass and Mauchsberg, and that are excluded from the measurements above.

An examined, parasitized specimen from Gibraltar near Penge differs from non-parasitized specimens in that it has a much shorter, bluntly rounded pygofer lobe, a plate apex that is much narrower and sclerotized, and a distinctly Y-shaped connective. It is included in P. longitrunculus   based on the shape of the plate and the shape of the sternite 7 of the associated female.

In the male the plate of P. longitrunculus   ( Fig. 2 k) and P. scolopygeus   sp. n. ( Fig. 2 l) are most similar, but P. scolopygeus   has a very short pygofer lobe and a distinct spine-like process on the medial surface ( Fig. 1 af), whereas in P. longitrunculus   the lobe is much longer and does not have a medial spine ( Fig. 1 p).

SANC

Agricultural Research Council-Plant Protection Research Institute

INHS

Illinois Natural History Survey