Bioacoustics of Neduba steindachneri

Stridulatory file. (n = 11) length 3.5–4.0 mm, 108–127 teeth, tooth density 31.3 ± 2.3 (27–35.3) teeth/mm. Song. (n = 26) Male songs are of the zwee-zwee type with PTR 3.7 ± 0.4 s- 1, faster than all other Convexa Clade species except some males of N. radicata . Males sometimes add partial PT when initiating song bouts. MPTL is 250.4 ± 47.6 ms. The OPT is poorly developed or absent. PTF is 13.1 ± 1.7 kHz. Males are nocturnal singers. Karyotype. (n = 5) 2n♁ = 26 ( 2m + 22t + XtXt) T86-74 , S86-95, topotype. Recognition. The male ventral sclerite is mushroom-shaped with a short, broad shaft and a wide, evenly curved apex with a short, blunt, recurved anterolateral projection. Tubercles are large, sparse, and confined to the apex. The titillators of N. steindachneri begin curvature after the midpoint of the shaft and are not as strongly curved dorsally (>90 o ) as seen in most other Carinata Group species ( Plate 9 ). Stridulatory file tooth density (27–35 teeth/mm) is lower than that of N. convexa (2-sample t -test, P = 5.48 ×10 -3 ) and also trends lower than N. cascadia (33–39 teeth/ mm). The female subgenital plate is pentagonal, flat, subequal in length and width, and with curved apical margins and a strongly pointed apex, which separates this species from N. cascadia females which have straight apical margins and from N. convexa and N. longiplutea females which have plates that are longer than wide. The song is unique in having reduced or absent OPT. The PTR is faster than all other convexa clade species. This species has the most northern range of any Neduba ( Fig. 9 ).