Turanogryllus zamakoensis Um Nyobe, Kekeunou & Bilong Bilong, 2022

Nyobe, Philene Corinne Aude Um, Robillard, Tony, Kekeunou, Sevilor, Ma, Libin, Nzike, Marcelle Mbadjoun & Bilong, Charles Felix Bilong, 2022, Description of two new species of Turanogryllini crickets (Orthoptera, Gryllidae, Gryllinae) from Cameroon, with identification keys for African species, Journal of Orthoptera Research 31 (1), pp. 83-89 : 83

Turanogryllus zamakoensis Um Nyobe, Kekeunou & Bilong Bilong sp. nov.

Material examined. -

Holotype: CAMEROON • ♂; Center Region, Zamakoe ; 3°33'816"N, 11°31'913"E; 14 February 2015; in crops field, quadrat trap; P. Um Nyobe & team leg.; MNHN-EO-ENSIF1749 . Allotype:- CAMEROON • ♀; Center Region, Zamakoe ; 3°33'816"N, 11°31'913"E; 21 March 2015; in crops field, quadrat trap; P. Um Nyobe & team leg.; MNHN-EO-ENSIF1713 .

Etymology. -

The species epithet Turanogryllus zamakoensis refers to the type locality.

Diagnosis. -

Turanogryllus zamakoensis sp. nov. is distinguished from congeners by light brown coloration, male genitalia provided with a large dorsal lobe of ectoparamere, and with microptereous FWs; the other species are either brachyptereous or macroptereous. In addition, it has only one outer tympanum while the other species have tympana on external and internal side.

Description. -

(Figs 2 , 3 ) Male. Size average, brown, lighter than other species. Head dark brown with four pale stripes on occiput, not extending over vertex (Fig. 2A ); cheeks pale (Fig. 2B ); ocelli large; face entirely pale below median ocellus and below level of antennae (Fig. 2C ). Pronotum covered with very fine pubescence, without bristles; dorsum dark brown, muscle attachment plates pale brown (Fig. 2A ); lateral lobes ivory, becoming dark brown at upper margin (Fig. 2B ). TI and TII ivory-colored; TI with a large outer tympanum. Hindlegs: f FIII pale brown with faintly darker oblique stripes on outer surface; darker around knees, especially on inner surface; TIII pale brown with 6 inner and 7 outer subapical spurs. FWs with square base, reaching abdomen mid-length; its length to pronotal length ratio ca. 2.5; dorsum brown; lateral field pale, dark brown between upper three veins. Stridulatory file with 156 teeth; harp with 3 oblique veins; mirror oval, with one dividing vein (Fig. 2E ). Hind wings short, hidden by FWs. Abdomen dorsum dark brown; venter pale; cerci pale. Male genitalia (Fig. 3 ): lateral lobes of epiphallus with styli at their posterior extremities, and these styli are provided with bristles; dorsal lobes of ectoparameres lamelliform, curved dorsally in its posterior half; ventral lobes of ectoparameres digitiform, sigmoidally curved; dorsal lobes of ectoparameres enlarged above ventral lobes of ectoparameres.

Female. Similar to male but occiput with 6 fine, well-individualized brown stripes; FWs short, overlapping slightly and with rounded ends (Fig. 2D ).

Male measurements (holotype, in mm). -

BL, 18.37; PL, 3.83; PW, 4.07; FWL, 9.41; CL, 9.00; FL, 12.18; FW, 4.25; TL, 8.61. Stridulatory file with 156 teeth.

Figures

Fig. 2. Morphology of Turanogryllus zamakoensis sp. nov. A. Male head and pronotum; B. Male lateral view of head and pronotum; C. Male face; D. Female head, pronotum, and FWs; E. Male FW. Scale bars: 10 mm (A); 8 mm (B, C); 7 mm (D); 5 mm (E). Abbreviations: cubital vein, cu. v.; anal vein, a. v. (postcubital vein, Pcu); median vein, m. v.; radial vein, r. v.; subcostal vein and its branches, sc. v.; oblique vein, o. v.; diagonal vein, d. v.; anal node, a. n.; mirror, m.; harp, h.; cord, c.; anal field, a. f.; apical field, ap. f.; lateral field, l. f.

Fig. 3. Male genitalia of Turanogryllus zamakoensis sp. nov. A. Dorsal view; B. Ventral view; C. Drawing. Scale bar: 500 µm. Abbreviations: posterior emargination of epiphallus, p. e. e.; stylus, sty.; lateral lobe of epiphallus, l. l. e.; dorsal lobe of ectoparamere, d. l. ect.; ventral lobe of ectoparamere, v. l. ect.