Isophya sonora, Sevgili, 2020

Sevgili, Hasan, 2020, Isophya sonora, a new bush-cricket species from Eastern Black Sea region of Turkey (Orthoptera: Tettigoniidae; Phaneropterinae), Zootaxa 4860 (2), pp. 284-292 : 286-288

Isophya sonora sp. n.

Holotype: Male - Turkey: Trabzon, Çaykara, Uzungöl-Demirkapı road, 07.08.2020, 40°34’20.453″ N, 40°23’19.289″ E, 1611m (coll. H. Sevgili & O. Sevgili).

Examined materials: The same locality with holotype ( Fig 1 ). 2 males, (coll. H. Sevgili & O. Sevgili). All materials are preserved in ethanol .

Description: Male. Fastigium verticis slightly narrower than scapus, distinctly narrowing distally, slightly depressed and sulcate dorsally ( Fig. 2A ).

Lateral keels of pronotum distinct, almost parallel in prozona and very strongly diverging backwards on metazona up to caudal margin ( Fig. 2B ); frontal and caudal margin of the disk almost straight ( Fig. 2B ). Pronotum with concave margin in profile and distinctly elevated at metazona ( Fig. 2C ); paranota with frontal margin oblique, caudal margin long and oblique ( Fig. 2C ).

Tegmina elongate, about more than 1.5 times the length of pronotum ( Fig 2D ); tegminal “disc” longer than wide, right margin of disc not projecting; speculum distinctly large, costal area of tegmen broadened ( Fig. 2B , 3 A–B, D).

Stridulatory file about 2.82 mm, with about 66 teeth, each gradually widening and becoming progressively sparse towards the apex ( Fig. 4 , 5 A–D). The shape and width of the teeth in the distal and proximal part of the file are distinctly different from each other ( Fig. 5 C–F). The distance between tegmina edge and apex of the file is 0.60 mm.

Fore femora 1.53 and hind femora 3.78 times as long as pronotum and without spines on ventral margins.

Epiproct wide and long ( Fig. 3C ), extending to the middle of the cerci; cerci moderately long, proximal 3/4 narrowing distally; distal ¼–⅕ incurved into and wide angle, slightly narrowed subapically, with narrowly rounded apex and with a distinct denticle ( Fig. 2 D–E). Subgenital plate large at base, tapering posteriorly, with a deep rounded or “V” shape incision ( Fig. 2F ).

Coloration as in Figures 3 A–D.

Female: Unknown.

Etymology: “ sonora ” is a Latin word, it means loud and noisy. The new species has loud male calling song.

Measurements (Average, Standard Deviation, mm, n= 3 males): Body length: 26.12 (0.51), Pronotum: 4.31 (0.29), Tegmina: 6.65 (0.09), Fore femur: 6.6 (0.41), Hind femur: 16. 30 (0.49).

Calling Song. The songs were recorded in the evening, while the air temperature was 27°C. The calling song is very loud and consists of a series of irregular syllables repeated at the approximate rate of 0. 362 s ( Fig. 6A ). The syllables consist of 5–6 spaced crescendo impulses and nearly 34 densely formed decrescendo impulses ( Fig. 6 C–D). There are also some songs that produce 1–3 impulses right after the main syllables ( Fig. 6D ). The major part of each syllable lasts about 0.162 s. The carrier wave of the song has its intensive signals between 15–25 kHz, but the frequency components with detectable sound pressure spread over the frequency range of 5kHz–45kHz ( Fig. 7 ). Some other measurements of the male calling song are shown in Table 1 .

Figures

FIGURE 1. Type locality of the new species on the map of Turkey, Isophya sonora sp. n.

FIGURE 2. The morphology of Isophya sonora sp. n., A. Fastigium from above, B. Pronotum and tegmina from above, C. Pronotum and tegmina in profile, D–E. Male cerci, F. Subgenital plate.

FIGURE 3. Male habitus Isophya sonora sp. n. (A–D) and I. karadenizensis (E–F, from type locality; Soðanlý Mountains, Trabzon, Turkey).

FIGURE 4. Dorsal and ventral view of tegmina of I. sonora sp. n. and I. karadenizensis.

FIGURE 5. SEM pictures of the male stridulatory organ of I. sonora sp. n.: A–B. General morphology of the file; C–D. Distal and proximal part of the file; E–F. Medial and distal pegs of the file at higher magnification.

FIGURE 6. Isophya sonora sp. n. Oscillograms of four different speeds of the male calling song.

FIGURE 7. The carrier wave of the male calling song of the new species has its intensive signals between 15–25 kHz (FFT size 1024, window-function Blackmann-Harris).