Bioacoustics of Plangia geroi

Etymology . Plangia geroi n. sp. is dedicated to Calogero Piazza (nickname ‘Gero’), excellent sports doctor and a very good friend. Affinities . Among the African species of Plangia without a black spot on the left tegmen the following have cerci shaped as in P. geroi n. sp. : P. astylata Massa 2021 , which, however, has a much smaller size than P. geroi n. sp. and lacks of styli; P. graminea (Serville, 1838) has cerci pointed, but they are stouter than those of P. geroi n. sp. ( Hemp et al. 2015 ). We do not know the male of P. villiersi Chopard, 1954 (described from the female sex); however, the female of P. villiersi has more oval tegmina ( Chopard 1954 ) than the female of P. geroi n. sp. Additionally, P. geroi n. sp. has been compared with the following species of Plangia with a black spot on the left tegmen: P. satiscaerulea Hemp, 2015 (see above) has quite similar cerci, but the stridulatory file has only 68-74 teeth, while in P. geroi n. sp. teeth are ca. 100; P. unimaculata Chopard, 1955 (from South Africa ), characterized by an evident round black spot on the left and right tegmina (Chopard 1955), has cerci stout and incurved, not pointed, as in P. geroi n. sp. Finally, P. amaniensis Hemp, 2017 has long, decussate cerci and P. variacantans Hemp, 2017 has unusually long styli.

Description . Male ( Fig. 13a ). Colour. Yellow-green, tibiae brown with blackish stripes, hind tibiae with black-tipped spines. Head and antennae. Fastigium of vertex as wide as scapus, not contiguous with the fastigium of frons. Face smooth. Thorax and legs. Anterior margin of pronotum concave, posterior margin rounded. Fore coxae armed with a spine. Fore femora short and compressed, with 3 spines on the inner ventral margin, fore tibiae a little compressed at the base, with open tympana, sulcate above, with 2 outer and inner ventral spines + 1 apical spur on each side, and 1 outer dorsal spur. Mid femora with 3 spines on outer ventral margin, mid tibiae with 3 outer and inner ventral spines + 1 apical spur on each side and 1 inner dorsal spur. Hind femora just compressed, with 4 spines on outer ventral margin, hind tibiae with 12 outer and inner dorsal spines and 9 outer and inner ventral spines + 3 apical spurs on each side. Wings. Tegmina 3.3 times longer than wide, with fore and hind margins more or less parallel, the fore margin only apically rounded. Stridulatory area of the left tegmen just raised, mirror on the right tegmen triangular ( Fig. 13e ); stridulatory file under the left tegmen arched and consisting of ca. 100 teeth evenly spaced ( Fig. 13d ). Abdomen. Cerci stout, pointed, in-curved and black-tipped ( Fig. 13c ); subgenital plate triangular, styli very small ( Fig. 13f ). Female ( Fig. 13b ). Same characters as the male, length/ width tegmina 3.3, ovipositor short, gently up-curved, with many small teeth dorsally and a few apical teeth ventrally. Subgenital plate triangular and pointed ( Figs 13g , 13h ).