Bioacoustics of Synagelides xiangyun

Diagnosis. The new species is similar to S. walesai Bohdanowicz, 1987 , S. tianmu Song, 1990 and S. serratus Liu, 2022 , but it differs from them in the following characters: male: (1) the retrolateral tibial apophysis maintains a nearly constant width from the proximal to the distal end, and the distal end is dorsally inclined at an angle of approximately 90° ( Figs 18D , 20B ; whereas it tapers gradually from the proximal to the distal end, and the dorsal inclination forms an obtuse angle, with the distal end being blade-like in S. serratus ; see Liu et al . 2022 : fig. 6F, G; it is narrower in the middle, with the distal end wider than the proximal base, and instead of having a dorsal inclination angle at the distal end, it extends with a curvature in S. walesai , see Bohdanowicz 1987 : fig. 23); (2) the prolateral cymbial apophysis is plate-like in prolateral view ( Fig. 18C ; whereas it is finger-like in S. walesai and S. serratus ; see Bohdanowicz 1987 : fig. 24 and Liu et al . 2022 : fig. 6D, C); female: (1) the septum is broad, and the posterior edge of the septum extends obliquely towards posterior central side (whereas it is almost horizontal in S. tianmu ; see Song 1990 : fig. 4B; it is extremely narrow in S. walesai , see Bohdanowicz 1987 : fig. 28); (2) the broad parts of the copulatory ducts, excluding the inflected part, almost entirely incline towards the center from the anterior to the posterior end of the epigyne ( Figs 19B–D , 20D ; whereas they are almost parallel to each other in the longitudinal direction in S. walesai , S. tianmu and S. serratus ; see Bohdanowicz 1987 : figs 27, 29, Song 1990 : fig. 4 C and Liu et al . 2022 : fig. 8D); (3) the spermathecae are almost crescent-shaped with their ends curved forward ( Figs 19B–D , 20D ; whereas they are relatively flat, resembling two paramecia in S. walesai , S. tianmu and S. serratus ; see Bohdanowicz 1987 : figs 27, 29, Song 1990 : fig. 4 C and Liu et al . 2022 : fig. 8D).