Poreuomena gracilicercata, Hemp & Massa, 2021

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 gracilicercata sp. nov. Figs 57-61

Material examined.

Zaire ( 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 (Teleki expedition) (Holotype ♂) ( HNHM) ; Democratic Republic of the Congo, Kivu, Terr. Mwenga, Kitutu , 650 m alt. (lumiere), IV.1958, N. Leleup (Paratype ♂) ( MRAC) .

Diagnosis.

The elongated and slender shape of the male cerci - thickened in the middle with an inner dent - and the 10th abdominal tergite forming two long downcurved processes are unique.

Description.

Male. Typical Poreuomena species with wings protruding over the body by only a few mm. Where tegmina meet when folded, interior part of cells of dark colour while surrounding and elevated veins green (or tawny in preserved insect). Rs branching off in the first half of the basal part of the tegmen. Tegmina with two flaps at their bases, the flap of the left wing smaller and more pointed than the broader flap with a rounded tip on the right tegmen. Left flap completely marked brown, right one partly brown, especially along the bulge of the stridulatory file on the underside (Fig. 57 ). Beneath flaps, tegmina with narrow longish, dark brown markings. Stridulatory file on the underside of left flap about 1.2 mm long; upcurved at the inner end with few smaller and widely-spaced teeth (about 5), in the middle part with widely set large teeth (about 12) and, at the apical end, with densely-set teeth decreasing in size (about 10-12); distal end strongly curved downwards (Fig. 58 ). 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 forming at the anterior part two convex bulges, at its posterior end differentiated into two long and slender and downcurved processes (Figs 60 , 61 ). Cerci strongly elongated, in the middle thickened with an inner sclerotised dent. Subgenital plate bilobate (Fig. 59 ).

Female. Unknown.

Measurements

(mm). Males (n = 2). Body length: 18.2-18.6; pronotum length: 3.9-4.05; length hind femora: 19.3-19.6; length of tegmina: 28.6-29.15; tegmina width: 4.98-5.0.

Distribution.

Democratic Republic of the Congo.

Etymology.

Named after the long and slender male cerci.

Figures

Figures 57 - 61. Morphological details of male Poreuomena gracilicercata sp. nov. Head, pronotum and stridulatory area (57), stridulatory file on the underside of the left tegminal flap (58), subgenital plate (59), lateral (60) and rear view (61) on apex.