Bioacoustics of Plangiopsis nouabalensis

Description . Male. General habitus & colour . Medium-sized species, green. Head and antennae . Antennae thin. Fastigium of vertex about 2.0 times as wide as scapus of antenna; fastigium verticis meeting equally broad fastigium of frons along a horizontal line; face smooth ( Fig. 5a ); eyes round. Thorax . Pronotum longer than high, with evident lateral, anteriorly converging carinae, flat and dotted disc, anterior margin broadly incurved, posterior margin rounded ( Figs. 8a , 10a ). Wings . Both pairs of wings fully developed; tegmina rounded at tips, narrow, 3.3 times longer as broad. Stridulatory file arched, consisting of ca. 40 teeth, from the inside towards the external margin always wider between them and thicker ( Fig. 12a ). Legs . Fore coxa armed. Fore femora dorsally unarmed, ventrally with 3 spines. Mid legs lacking. Hind femora with 7 ventral outer and inner spines. Fore tibiae with conchate tympanum on inner side and open tympanum on outer side, with a ventral double row of 4 spines. Hind tibiae with double row of 12 spines on ventral side and many on dorsal side; 3 sclerotized spurs on each side. Abdomen . Last abdominal tergite unmodified. Cerci long, stout, apically narrowing and incurved with a very small apical spine. Subgenital plate straight with two styli ( Figs. 13a–13b ). Female. Same characters of the male, ovipositor gently upcurved, subgenital plate triangular and pointed.

Affinities . Figs. 5a–5d show the face of P. nouabalensis n. sp. , P. foraminata , P. adeps and P. semiconchata . Compared to the other species, the fastigium of the vertex is clearly wider in P. semiconchata . The shape of the tegmina of P. nouabalensis n. sp. is more similar to that of P. adeps than to the other species ( Figs. 8a, 8d , 10a, 10c ). The carinae of the pronotum of P. nouabalensis n. sp. are not denticulate as in P. semiconchata ( Figs. 10a, 10b , 11a, 11b ) and in Plangiola herbacea ( Fig. 10e ), but are more similar to those of P. foraminata ( Fig. 11c ). The stridulatory area of P. nouabalensis n. sp. ( Fig. 11a ) is more similar to those of P. semiconchata ( Fig. 11b ) and P. adeps ( Fig. 11d ) than to that of P. foraminata ( Fig. 11c ), the stridulatory file of P. nouabalensis n. sp. ( Fig. 12a ) is very different from those of P. foraminata ( Fig. 12b ) and P. semiconchata ( Fig. 12c ) and more similar to that of P. adeps ( Fig. 12d ). Finally, cerci and subgenital plate of male and female of P. nouabalensis n. sp. ( Figs. 13a, 13b ) are more similar to those of P. adeps ( Figs. 13c, 13d ) than to those of the other two species of Plangiopsis ( Figs. 14a, 14d ). Finally, P. adeps has a bigger size than the new species (body size: 24.5–26.5 mm ).