Account
What the sources say about this taxon, as written.
etymology · 
Plazi
Etymology. cascadia , reflecting the southern Cascade Range distribution. Notes. The distribution of this species lies between that of N. steindachneri to the north and N. convexa to the south. Further studies are needed to determine the limits of the ranges of northern Carinata Group taxa. Museum specimens from intermediate localities are nymphs and are only tentatively identified as this species. The calling songs and genitalia of all three species differ, so sympatry may be expected if these differences confer reproductive isolation. That calling song extremes of PTR occur in two species with adjacent ranges suggests prezygotic reproductive isolation mediated by calling song.
distribution · Plazi
Distribution. Southern Cascade and Siskiyou mountain ranges of southern Oregon . Habitat. Understory and edges of coniferous forest. Seasonal occurrence. Scant records are from mid-July through late August. Adult activity probably lasts from midsummer through fall until first frosts. Stridulatory file. (n = 4) length 3.4–3.7 mm , 125–133 teeth, tooth density 36.7 ± 2.1 (33.8–38.8) teeth/mm. Song. (n = 6) Typical Convexa Clade “zwee-zwee” song type but with a significantly slower PTR of 1.8± 0.1 s- 1 (ANCOVA P = 1.08×10 -5 ) and longer MPTL of 498.2 ± 65.5 ms (ANCOVA P = 4.27×10 -11 ) than all other Convexa Clade taxa. PTF is 13.9 ± 2.2 kHz. Karyotype. (n=2) 2n♁ = 26 ( 2m + 22t + Xt +Yt) T19-16, S19-90, paratopotype. Recognition. The male ventral sclerite of N. cascadia has a blunt apex with scattered large tubercles and a short lateral process that blends into the shaft by an obtuse angle. This contrasts with N. convexa and N. longiplutea , both distributed to the south, which have the ventral sclerite apex low if not flat and a long lateral process with numerous fine tubercles that are arranged in rows. N. steindachneri to the north has a mushroom-shaped ventral sclerite with few large tubercles and a blunt, recurved lateral process. The female subgenital plate is unique among the Convexa Clade in having straight apical margins. The slow PTR separates the song of N. cascadia from all other Carinata Group species; N. steindachneri to the north has the fastest PTR in this species Group.
description · Plazi
Fig. 9 (distribution), Fig. 17 (male and female habitus, calling song, male and female terminalia, karyotype), Plate 1 F–H (live habitus), Plate 4H (male calling song), Plate 7E (male ventral sclerite), Plate 11H (female subgenital plate). Common name. Cascade Shieldback. History of recognition. None.
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