Bioacoustics of Aglaothorax nesiazo

Stridulatory file. (n=9) length 2.80–3.35 mm , 76–108 teeth, tooth density 31.1±4.7 (26.2–38.6) teeth/mm. Song. (n=7) Common song of small Aglaothorax with countable pulse trains. Pulse trains 70±20 ms in length are produced at a rate of 5.46± 1.75 s- 1. Mean peak frequency is 16.61±3.42 kHz, the peak shifting as high as 22.40 kHz when high frequency recording equipment was used. Echemes are variable and consist of 30±15 (range 12–45) pulse trains repeated at a rate of 2–14 min-1 . Karyotype. (n=3) 2n ♂ =24 ( 22t +XtYt), paratopotype , T21-23 (S21-21). Recognition. Morphology, geography. Although the paraproct processes usually have an apical tooth, the male supra-anal plate is square and the titillators are short and barely bowed, eliminating the Diminutiva Group in which males have heart-shaped or caudally indented supra-anal plates. The long, slender, cylindrical paraproct processes eliminate A. costalis , A. morsei , and A. hulodomus from consideration. The male subgenital plate has thin, cylindrical styli unlike the thick cone-shaped styli of A. conistylus . The male titillator arms are short and nearly straight and without a basal notch, which eliminates A. amathitis , A. conistylus , A. costalis , A. longipennis , and A. morsei . From adjacent Baja California species to the south, A. kelainops and A. sphenosternum also have shorter paraproct processes, about 2 times as wide plus rounded supra-anal plates. Both sexes of A. sphenosternum may be separated by the wedge-like prosternal spines in contrast to the long, thin, spines of A. nesiazo . Females have short, triangular lateral processes on the subgenital plate, unlike most Diminutiva Group females. The female subgenital plate lateral processes are as long as wide, unlike A. kelainops and A. constrictans females which have the triangular lateral processes longer than wide.