Poreuomena africana Brunner von Wattenwyl, 1878

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 africana Brunner von Wattenwyl, 1878 Figs 22-28

Poreuomena africana Brunner von Wattenwyl, 1878. Monographie der Phaneropteriden, 187; type locality: Gabon ( MHNG).

Material examined.

Cameroon (1♂, 1♀) (MCNM) ; Cameroon, Campo Ma'an National Park (lowland rainforest) (950 m alt.) 10-22. III. 2018 (UV Cold Cathode Light Trap), Fotsing, Ishmael, Miles, Safian (2♂ in ANHRT; 1♂ in BMPC) ; Gabon, Mikongo (Rougier), Mts de Cristal (secondary forest) (430 m alt.) 0°29'47"N, 11°10'42"E, 28. VII-12. VIII.2019 (LepiLED Light Trap), Albert, Aristophanous, Bie Mba, Dérozier, Moretto (1♂) (ANHRT) ; Gabon, Mts de Cristal National Park , Kinguelé 3. XII. 2015 (UV) (BMPC) ; Gabon, M’Bigon 26. I. 1986, A Pauly (1♂) ( RBINS) .

Diagnosis.

The 10th abdominal tergite (Fig. 25 ) is similar to that of P. lamottei (Fig. 78 ) - with two lateral processes. However, the male cerci are completely different in P. africana , broader at the base tapering to acute tips of the two branches (Figs 22 , 25 , 28 ) while the male cerci in P. lamottei are simple, expanded into three tips apically (Fig. 78 ).

Description.

Tegmina about 5.8-5.9 longer than broad. Stridulatory file 0.3 mm long; teeth more widely spaced at inner side, becoming more densely set distally (Fig. 24 ). Fore femora unarmed. Mid femora with 4-5 outer ventral small spines, inner ventral side unarmed. Hind femora only distally with a ventral double row of 2-3 small spines. Fore tibiae with a ventral double row of 4-5 spines; mid tibiae with a ventral double row of 5 spines, hind tibiae with 4 rows of numerous spines and apically 3 spurs on each side. Last abdominal tergite enlarged and apically bilobate and flattened (Figs 22 , 25 , 26 ); cerci basally stout, apically divided into two tips, the inner shorter and incurved, the outer longer, flattened, outcurved and with 5-6 inner dark teeth like a knife (Figs 22 , 25 , 28 ). The subgenital plate is short with two stout lobes with rounded tips (Figs 26 , 27 ).

Colour.

Small species, uniformly green-yellowish, a little brownish around the stridulatory area (Fig. 23 ) and small black dots on the posterior margins of the tegmina.

Measurements

(mm). Males. Body length: 18.5-19.9. Pronotum length: 3.7-3.8. Pronotum height: 2.8-2.9. Length of hind femora: 19.6-19.8. Length of tegmina: 26.5-26.8. Width of tegmina: 4.5-4.6.

Figures

Figures 22 - 28. Morphological details of male Poreuomena africana. Drawing Fig. 53, taken from Brunner von Wattenwyl (1878) (22), head and stridulatory area (23), stridulatory file on the underside of the left tegmen (24), apex in rear view (25) and lateral view (26), subgenital plate (27) and cerci (28).

Figures 75 - 79. Morphological details of male Poreuomena lamottei. Stridulatory area (75), stridulatory file on the underside of the left tegminal flap (76), lateral (77) and dorsal view (78) on apex of abdomen, subgenital plate (79).

Figures 52 - 56. Morphological details of male P. gladiator (= P. forcipata) (lectotypus). Habitus (52), stridulatory file on the underside of left tegminal flap (53), stridulatory area (54), dorsal view (55) and ventral view (56) on apex. Arrow in Fig. 55 shows the asymmetrical spine.