Account
What the sources say about this taxon, as written.
description · 
Plazi
Fig. 15 (distribution), Fig. 20 (male and female habitus, calling song, male and female terminalia, karyotype), Plate 5 (male terminalia), Plate 8 (female subgenital plate), Plate 11 (male titillators), Plate 14 (male calling song). Common Name. Bluffs Shieldback. History of recognition. Populations from Palos Verdes, Los Angeles County, California treated as A. morsei ( Rentz & Birchim 1968 ) .
description · Plazi
Stridulatory file. (n=6) length 3.10–4.00 mm, 80–104 teeth, tooth density 27.1±2.9 (22.5–30.3) teeth/mm. Song. (n=29) Pulse trains 80±40 ms in length are repeated at a rapid rate of 9.70± 0.93 s- 1. Mean peak frequency is 16.02±3.38 kHz; using high frequency recording equipment the peak frequency borders on ultrasonic at 20.50 kHz. Echemes that consist of 10±6 pulse trains (range 3–24 pulse trains/echeme) occur at a rate of 1–21 echemes/ min-1 . The number of pulse trains/echeme is similar to A. costalis but the A. costalis pulse train rate is approximately one third faster at 15 s-1 . Karyotype. (n=3) 2n ♂ =24 ( 22t +XtYt), paratopotype T92-28 (S92-58). Recognition. Morphology, song, ecology, and geography. Male supra-anal plate rounded and tongue-like, paraproct with a subapical tooth, and titillators short, unlike Diminutiva Group species with the supra-anal plate heart-shaped or indented on the apical margin, the paraproct process tooth apical, and the titillators long and bowed. The male paraproct is cylindrical and twice as long as wide unlike A. costalis . The male supra-anal plate of A. amathitis is flat while those of A. costalis and A. longipennis are dorsally concave. The short male titillator arms do not have the basal notch found in A. morsei and A. constrictans . The female subgenital plate lateral processes are short, unlike Diminutiva Group species, with the posterior margin low and rounded rather than straight as in A. costalis . The A. amathitis pulse train rate of 9–11 s-1 is faster than that of A. morsei at 4–6 s-1 . The songs of A. amathiti s and A. longipennis are similar, but the echemes of the former contain more pulse trains (3–24 vs. 2–6) that are produced a slower rate (9–11 vs. 11-15 s-1 ). This species inhabits stabilized sand dunes in the Los Angeles Basin.
iNaturalist