Tetraconcha unicolor Gorochov, 2023

Gorochov, A. V., 2023, New taxa of the subfamily Phaneropterinae (Orthoptera: Tettigoniidae) from Africa: the tribes Otiaphysini and Preussiini, Caucasian Entomological Bulletin (Caucas. entomol. bull.) 19 (1), pp. 23-30 : 26-29

Tetraconcha unicolor Gorochov , sp. n.

( Figs 22–28 )

Material. Holotype, ♂ ( ZIN): Uganda, western region, Kibale Distr., Kibale Biological Station of “MakerSU”, 0°33ʹ68ʺN / 30°21ʹ42ʺW, 1511 m, forest, 19– 24.10.2014 ( V. V. Anikin).

Description. Male (holotype). General appearance more or less similar to that of T. bicolor sp. n., but following differences presented: body colouration more uniformly yellowish (possibly greenish in living condition) with light brown antennal flagellum and area on pedicel as well as most part of fore and middle tibiae and tarsi, rose median ocellus and rather sparse dots on lateral and hind lobes of probotum as well as on most prt of all femora (but distal femoral parts with brownish rose and distinctly denser dots), brownish grey eyes and a pair of small marks on dorsal borders of lateral ocelli, brown all membranes in distal part of tegminal costal area as well as in most part of dorsal field (but widened part of this field light brown in right tegmen and partly greyish brown in left one, and lateral tegminal field with distinct group of greyish brown membranes near stridulatory apparatus; Figs 22, 25, 26 ), and transparent hind wing having yellowish apical part and yellowish rose rest of venation ( Fig. 23 ); structure of tegminal stridulatory apparatus as in Figs 25 and 26 , with stridulatory vein of left tegmen slightly more arcuate than in T. bicolor sp. n. but having almost straight sublateral part which provided with a few teeth larger and sparser than others (three of these larger teeth largest and most sparse; Fig. 28 ); costal part of hind wing as in Fig. 23 ; abdominal apex similar to that of T. bicolor sp. n., but epiproct probably shorter or deformed (strongly retracted under last tergite), cercus with slightly more hooked distal portion having its heavily sclerotized (darkened) small apical part almost denticlelike ( Figs 24, 27 ), and genital plate with somewhat less narrow distal third and posteromedian notch ( Fig. 27 ).

Female unknown.

Length (in mm). Body 14.7; body with wings 43; pronotum 4; tegmina 33; hind femora 22.

Comparison. ffle new species differs from T. bicolor sp. n. in a more uniform colouration of the tegmina, a different structure of the stridulatory teeth of the left tegmen, and some other small details listed above (in the description). From T. loubesi Massa, 2017 , T. morettoi Massa, 2017 and T. fusca Massa, 2021 having more or less similar colouration of body and the structure of these teeth, T. unicolor sp. n. is distinguished by the widened part of the dorsal tegminal field less projecting medially (from T. loubesi ), by this tegminal part longer (from T. morettoi ), by a narrower posteromedian notch of the male genital plate (from both these species), and by a not S-shaped ventral part of the stridulatory vein in the left tegmen (from T. fusca ). From all other congeners, it differs in the characteristic structure of stridulatory teeth (a few sublateral teeth are clearly larger and sparser than others) and in the same characters as T. bicolor sp. n. (except for the tegminal colouration and the structure of stridulatory teeth), and additionally from T. banzyvilliana and T. perezi Massa, 2017 , in a less dark colouration of the tegminal lateral field.

Etymology. fflis species name is the Latin word “unicolor” (one-colour, monochrome) due to the general colouration of the tegmina.

Figures

Figs 15–28. Species of the genus Tetraconcha, males, details of structure. 15–21 – T. bicolor sp. n.; 22–28 – T. unicolor sp. n. 15, 25 – stridulatory apparatus of left tegmen; 16, 26 – stridulatory apparatus of right tegmen; 17, 22 – left tegmen; 18, 23 – costal part of left hind wing; 19, 24 – cercal apex from above; 20, 27 – abdominal apex from above and slightly behind; 21, 28 – stridulatory vein of left tegmen ventrally. Рис. 15–28. ВиΑы роΑа Tetraconcha, самцы, ΑетаΛи строения. 15–21 – T. bicolor sp. n.; 22–28 – T. unicolor sp. n. 15, 25 – стриΑуΛяционный аппарат Λевого наΑкрыΛья; 16, 26 – стриΑуΛяционный аппарат правого наΑкрыΛья; 17, 22 – Λевое наΑкрыΛье; 18, 23 – костаΛьная часть Λевого заΑнего крыΛа; 19, 24 – вершина церка сверху; 20, 27 – вершина брюшка сверху и сΛегка сзаΑи; 21, 28 – стриΑуΛяционная жиΛка Λевого наΑкрыΛья вентраΛьно.