Poreuomena matthaei, 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 matthaei sp. nov. Figs 86-90

Material examined.

Gabon, Lope National Park, Ogooue-Ivindo 4.IV.2014, Ecotrop Team (♂ holotype) (BMPC) .

Diagnosis.

P. matthaei sp. nov. is a comparatively large Poreuomena species, characterised by its yellowish colour, whitish triangular areas on the left and the right tegmina and incurved cerci with a flattened blackish tip. The 10th abdominal tergite is similar to that of P. gracilicercata sp. nov. Both species, however, have differently-shaped male cerci. While all other Poreuomena species have flaps at the bases of the tegmina, in P. matthaei sp. nov. only the area at the base of the right tegmen is developed as a flap, while on the right side, a bulge is present (Fig. 86 ).

Description.

Male. Yellowish-cream coloured with a faint blackish stripe on the stridulatory area (Fig. 86 ); the triangular area close to the stridulatory file above the left tegmen and the corresponding area on the right tegmen are whitish. Antennae thin, fastigium of the vertex separated from the fastigium of the frons, face smooth, eyes round, prominent. Pronotum with a flat and smooth disc, the anterior margin straight, the posterior margin broadly rounded (Fig. 86 ). Tegmina narrow, ca. 10.7 × broader than long; stridulatory area of the left tegmen comparatively long for the genus. Stridulatory file 0.5 mm long, with ca. 70 slightly arched teeth which are more evenly spaced at their base than at the apex (Fig. 87 ). Fore coxa armed, fore femora with 4 small spines on the ventral inner margins, mid femora with 5-6 small spines on the ventral outer margins, hind femora with 3-4 rows of small ventral spines distally. Fore tibiae with the tympanum conchate on the inner and open on the outer side, with 3-4 small spines on the inner margins, mid tibiae with 3-4 small spines on the outer margins, hind tibiae with numerous spines and 3 apical spurs on each side. Last abdominal tergite flattened and enlarged (Figs 88 , 89 ), cerci basally stout, long and incurved, their tips blackish and flattened. Subgenital plate elongated with two roundish lobes (Fig. 90 ).

Female. Unknown.

Measurements

(mm). Males. Body length: 23.6; pronotum length: 4.8; pronotum height: 2.7; length hind femora: 22.8; length of tegmina: 32.0; width of tegmina: 3.0.

Etymology.

P. matthaei sp. nov. is dedicated to the late Matteo Griggio, who at the age of 43 left us on 14 May 2020 due to an aneurysm. Matteo was a lively behavioural ecologist who was also very committed to nature conservation, curious about every particular aspect of nature, including Orthoptera as a food source for the Rock Sparrow in Sardinia.

Distribution.

Presently known only from the Lope National Park (Gabon).

Figures

Figures 86 - 90. Morphological details of male Poreuomena matthaei sp. nov. Head, pronotum and stridulatory area (86), stridulatory file on the underside of the left tegminal flap lateral (87), lateral (88) and rear view on apex (89) and subgenital plate (90).