Poreuomena wilverthi Griffini, 1908

Hemp, Claudia & Massa, Bruno, 2021, Biogeographical and evolutionary aspects of a Guineo-Congolian bushcricket tribe: Revision of the genera Cestromoecha Karsch, 1893 and Poreuomena Brunner von Wattenwyl, 1878, with the description of new species (Orthoptera, Tettigoniidae, Phaneropterinae), Deutsche Entomologische Zeitschrift 68 (1), pp. 45-79 : 45

Poreuomena wilverthi Griffini, 1908 Figs 101-107

Poreuomena wilverthi Griffini, 1908. Mem. Soc. entom. Belgique, Bruxelles 15: 85; type locality: Democratic Republic of Congo, Umangi ( RBINS).

Material examined.

Democratic Republic of Congo, Umangi IX-XI.1896 (♂ holotype) ( RBINS) . Central African Republic, Lesse , Lt. Bonnevie (1 ♂) ; Democratic Republic of Congo, Binga , 8-III-1932, H. J. Bredo (1 ♂) ( MRAC) ; Democratic Republic of the Congo, N Lac Kivu, Rwankwi , IV 1948, J. V. Leroy ( MRAC) ; Democratic Republic of the Congo, Yamgambi , 15.6.1949, Rev Pére, J. K. A. van Boven (1 ♂) ( MRAC) ; Democratic Republic of the Congo, Yambata, II / III -1914, Dr Giorgi (2♂) ( MRAC) ; Democratic Republic of the Congo, 180 km W from Bukavu , rainforest, 14.V.1988, leg. A. Vojnits et al., Arthropoda collected at 160 W MV lamp, No. 320 and 326 (Teleki expedition) (1♂) ( HNHM).

Re-description.

Male. Typical Poreuomena species with wings protruding over the body by only a few mm (Figs 101 , 102 ). Where tegmina meet when folded, interior part of cells of dark colour while surrounding and elevated veins green (tawny in preserved insect). Rs branching off in the first half of the basal part of the tegmen. Tegmina with two flaps at their base, the flap of the left wing smaller and more pointed than the broader flap with a rounded tip on the right tegmen. The stridulatory rib and surrounding part of the flap of the left tegmen marked dark brown, few patches of brown on right tegmen. Area beneath flap with large brown marking. Stridulatory file on the underside of left flap about 1.2 mm long; the area at the inner side of the file strongly curved; with a few small widely-set teeth (Fig. 103 ). This part is followed to about the middle of the file by about 16-18 large and increasingly more densely-set large teeth changing then to about 40 or more very densely-set teeth decreasing in size apically. Stridulatory file on the right tegminal flap not as strongly developed, but of similar shape and the same arrangement of the teeth. The 10th abdominal tergite a rounded flap with a median groove and an indentation at the posterior margin giving the structure a bilobate shape (Figs 106 , 107 ). The cerci are thick and slightly incurved with a very narrow and pointed tip (Figs 104-107 ). The subgenital plate is bilobate with short lobes with rounded tips (Fig. 105 ). Between the subgenital plate and the cerci, thick blade-like titillators are present (Fig. 107 ).

Female. Unknown.

Measurements

(mm). Males (n = 7). Body length: 17.2-19.5; pronotum length: 3.7-4.0; pronotum height: 2.6-3.0; length hind femora: 18.5-23.2; length of tegmina: 27.9-30.0. Width of tegmina: 3.8-5.1.

Distribution.

Widespread west of the Albertine rift into the area of the Central African Republic.

Remarks.

At present only the holotype was known. The new material studied coming from the Natural History Museum of Budapest and the Africamuseum Tervuren considerably enlarges the known area of distribution of this species (Fig. 111 ).

Figures

Figure 111. Distribution of species of the genus Poreuomena.

Figures 101 - 107. Morphological details of male Poreuomena wilverthi. Habitus (101, syntype, 102), stridulatory file on the underside of the left tegmen (103), lateral view on apex (104), subgenital plate (105), apex ventral-lateral (106) and dorsal-lateral view (107).