taxonID	type	description	language	source
03838780FF95831EFF68B707F261FE4E.taxon	materials_examined	Material examined: Kazakhstan: 1 10 km SE of Aktobe, near Aktjubinsk reservoir, N 50 ° 09.6 ’, E 57 ° 18.8 ’, 25.06.2018, 4 ♂, leg. V. Vedenina & N. Sevastianov (CV), song recordings in 4 ♂; 2 Pavlodar region, ab. 44 km SW of Pavlodar, environs of Pogranichnoe, N 52 ° 05.4 ’, E 76 ° 24.9 ’, 04.07.2019, 1 ♂, 1 ♀, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV), song recording in 1 ♂; 3 Pavlodar region, between Terenkol’ and Beregovoe, near Irtysh River, N 53 ° 05.1 ’, E 75 ° 56.6 ’, 05.07.2019, 3 ♂, 3 ♀, (CV), leg. V. Vedenina, N. Sevastianov & T. Tarasova, song recordings in 2 ♂; Petropavlovsk, 3.07.1929 (ZMMU); 1 ♀, lake Balkhash, reed, 1.08.1935, 1 ♂, 1 ♀, leg. N. Djukov (ZMMU); 4 Almaty region, ab. 60 km NE of Taldykorgan, near Kapal, N 45 ° 08.4 ’, E 79 ° 01.3 ’, 1220 m a. s. l., 01.07.2016, 3 ♂, leg. V. Vedenina & T. Pushkar (CV), song recordings in 2 ♂; 5 Jetisu region, Kerbulak district, Altyn-Emel pass, N 44 ° 12.606 ’, E 78 ° 30.392 ’, 1667 m a. s. l., 22.06.2023, 6 ♂, 1 ♀, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV), song recordings in 2 ♂; Uzbekistan: Khumsan, Kazakst. 1300 m a. s. l., 9.08.1935, 1 ♂, leg. N. Troitzkii (ZMMU); Turkmenistan: West Kopet-Dag, canyon Ai-Dere, 09.09.1966, 3 ♂, 2 ♀, leg. M. Chernjakhovsky (ZMMU); Russia: Altai Krai, ab. 14 km NW of Byisk, N 52 ° 39.1 ’, E 85 ° 03.8 ’, 272 m a. s. l., 05.08.2017, 3 ♂, leg. V. Vedenina & N. Sevastianov (CV); Altai Republic, Ongudai district, surr. of Kupchegen, N 50 ° 37.144 ’, E 86 ° 26.440 ’, 820 m. a. s. l., 08.08.2017, 1 ♀, leg. V. Vedenina & N. Sevastianov (ZMMU); Altai Republic, Ongudai district, near Tuekta, N 50 ° 50.7 ’, E 85 ° 51.5 ’, 925 m a. s. l., 19.08.2021, 1 ♂, leg. N. Sevastianov, T. Tarasova & N. Ermilov (ZMMU); Altai Republic, Ulagan district, ab. 13 km N of Aktash, N 50 ° 25.854 ’, E 87 ° 34.561 ’, 1903 m a. s. l., 06.08.2023, 1 ♂, 1 ♀, leg. V. Vedenina, N. Sevastianov & E. Kovalyova (ZMMU); Altai Republic, Kosh-Agach district, surr. of Kyzyl-Tash, N 50 ° 12.309 ’, E 87 ° 56.780 ’, 1497 m a. s. l., 07.08.2023, 6 ♂, 2 ♀, leg. V. Vedenina, N. Sevastianov & E. Kovalyova (ZMMU); 6 Altai Republic, Kosh-Agach district, ab. 9, 5 km SE of Zhana-Aul, N 49 ° 46.165 ’, E 88 ° 59.950 ’, 2013 m a. s. l., 08.08.2023, 3 ♂, 1 ♀, leg. V. Vedenina, N. Sevastianov & E. Kovalyova (CV), song recordings in 3 ♂.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF95831EFF68B707F261FE4E.taxon	distribution	Disribution. The species occurs very locally in Italy (as subspecies C. karelini bruttius Fontana & LaGreca, 1999), in the north-eastern part of Asia Minor, very locally in Ukraine (Kherson region, Askania-Nova), in the south-eastern part of European Russia, Transcaucasia, Kazakhstan, Middle Asia and Iran, eastward reaching Irkutsk region of Russia and north-western Mongolia (Bey-Bienko & Mistshenko, 1951; Fontana & La Greca, 1999; Vedenina & Bukhvalova, 2001; Benediktov, 2005; Vedenina & Helversen, 2009; Vedenina et al., 2020; Gantigmaa & Myagmar, 2022). The northern border of the C. karelini range may overlap with the southern border of the C. albomarginatus range, where these species may hybridize (Vedenina, 2015). C. albomarginatus inhabits northern and central Europe and northern Siberia, reaching Yakutia in the east. All sibling species of the C. albomarginatus group were shown to be vicarious (Vedenina & Helversen, 2009). For example, C. albomarginatus does not occur in Kazakhstan, Middle Asia, or the southern Siberia, where it is replaced by C. karelini. We suggest, therefore, that C. albomarginatus can’t be found in Mongolia or China, and its records in these countries were erroneous (e. g., Zheng & Xia 1998; Gantigmaa & Myagmar 2022). By contrast, we expect to find C. karelini in both China and Mongolia.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF95831EFF68B707F261FE4E.taxon	description	Morphology. The males of C. karelini can be reliably distinguished from those of C. albomarginatus, C. angulatus and the new species by the number of stridulatory pegs and the peg position and density on the proximal third of the stridulatory file (Fig. 4). The peg number in C. karelini varies from 140 to 188 in different populations, being higher than in other three species (Table). On the proximal third of the file in C. karelini, the pegs are arranged in two or even three rows (Fig. 4 A), in contrast to other three species, in which the pegs are organized in one row. The males of C. karelini can be also distinguished from those of C. angulatus and C. kegenicus by the highest ratio of tegmen length to distance from the tegmen base to bifurcation of M vein (Table, Fig. 5 A). The females of C. karelini can be distinguished from those of C. angulatus and C. kegenicus by the structure of stridulatory file. In C. karelini (and also in C. albomarginatus), stridulatory pegs are thin and resemble the bristle stumps (Fig. 6 A, B). Moreover, proximal edges of the sclerotized walls surrounding these stumps are noticeably elongated. By contrast, the pegs in the C. angulatus and C. kegenicus females resemble the well-developed male pegs (Fig. 6 C, D). Both sexes of C. karelini tend to have the longest tegmina (Table, Fig. 7 A, B) in comparison to C. angulatus and the new species.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF95831EFF68B707F261FE4E.taxon	biology_ecology	Calling song. As a rule, a male of C. karelini produces 3 – 4, rarely up to 8 echemes separated by intervals of 1.5 – 2.5 s (Fig. 3 A – C). Each echeme lasts for about 0.3 – 0.5 s. In the echeme beginning, the male vibrates with the two legs synchronously; during the main part of a song, the legs move alternately, each leg at a rate of about 45 – 60 / s. Oscillographic analysis shows that a first loud pulse and several subsequent quiet pulses are sometimes separated from the following 20 – 25 pulses of a song by a pause. However, this feature may vary individually. The sound pulses of the main part of each song follow at a rate of 90 – 120 / s. The calling song of C. albomarginatus is very similar to that in C. karelini: the difference between these species lays mainly in the echeme duration (about 1.25 times more in C. albomarginatus than in C. karelini) and pulse rate (about 1.25 times less in C. albomarginatus than in C. karelini; Vedenina & Helversen, 2009). Such similarity in calling songs may prevent them from living together. On the other hand, the calling songs of the C. albomarginatus group substantially differ from the calling songs of C. angulatus and C. kegenicus (Figs. 8, 9). The calling echemes in both latter species last twice as long as in C. karelini. In C. angulatus, the two legs are moved much slower (22 – 40 / s) than in C. karelini, and the two legs are moved synchronously during the whole echeme. In C. kegenicus, the legs are moved at least three times slower than in C. angulatus, and this results to producing of 5 – 6 syllables per echeme. Courtship song. The courtship song of C. karelini starts with alternation of two elements, which are repeated with the period of about 1 s (Fig. 3 D – F). When producing an element 1, the legs vibrate synchronously at the rate of about 10 – 11 / s. When producing an element 2, the two hind legs vibrate with a phase shift at the rate of about 26 – 32 / s. Oscillographic analysis shows that the syllables of the element 1 consist of the well pronounced pulses repeated at the rate of 21 – 24 / s, whereas the syllables of the element 2 contain much more dense pulses following almost without gaps. The alternations of these two elements can last up to 2 – 3 min, followed by a complex of three more elements. An element 3 is similar to the element 2, but is remarkably longer, reaching 4 – 8 s in duration. Then comes a rather short (200 – 400 ms), element 4, which is produced by the low-amplitude synchronous leg vibrations at the rate of about 40 – 53 / s. A subsequent element 5 is accompanied by two fast strokes of the legs (Fig. 3 F). A second stroke is accompanied with lifting of abdomen and produced with the tibiae; the maximal angle between tibia and femur is 30 °. Both strokes are produced with synchronous movements of the two legs, but most of the element 5 is generated by alternate leg movements. The element 5 reminds the calling song of C. karelini. The complex of the elements 3, 4 and 5 is usually repeated 2 – 3 times, and then again followed by the alternation of the elements 1 and 2. The courtship song of C. karelini strongly differs from the courtship songs of C. albomarginatus (Vedenina & Helversen, 2009), C. angulatus and C. kegenicus. In the two latter species, the courtship songs start with the small-amplitude movements of the hind legs, which generate short syllables repeated at the rate of about 3.5 – 6 / s (element 1, Figs. 8, 10). In about 0.2 – 1 min, there comes the elements 2 and 3; in contrast to the element 1, they are produced by rather complex leg movements. One of these elements remind the calling song of each species. However, the temporal structure of sound elements 2 and 3 is completely different from that in the C. karelini courtship, and the males of C. angulatus and C. kegenicus do not produce strokes with hind tibiae.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9E831FFF68B338F5C7FB7E.taxon	materials_examined	Material examined. Kazakhstan: 7 Almaty, environs of Zoology Institute, 01.07.1994, 12 ♂, 1 ♀, leg. D. Tishechkin (ZMMU), song recordings in 7 ♂; Almaty, Botanic Garden, 28.06.1994, 4 ♂, leg. D. Tishechkin (ZMMU); environs of Chemalgan, 20 km W of Almaty, 08.07.1994, 2 ♂, leg. D. Tishechkin (ZMMU); Jetisu region, Alakol district, ab. 7, 5 km S of Koktuma, N 45 ° 47.739 ’, E 81 ° 38.271 ’, 655 m a. s. l., 26.06.2023, 1 ♂, 1 ♀, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV); 8 Jetisu region, Kerbulak district, environs of Basshi, along stream, N 44 ° 10.136 ’, E 78 ° 45.064 ’, 988 m a. s. l., 05.07.2016, 4 ♂, 1 ♀, leg. V. Vedenina & T. Pushkar (CV), song recordings in 2 ♂; same locality, 22.06.2023, 3 ♂, 2 ♀, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV), song recordings in 3 ♂; Jetisu region, Panfilov district, ab. 6 km SW of Zharkent, N 44 ° 08.431 ’ E 79 ° 55.325 ’, 594 m a. s. l., 21.06.2023, 1 ♂, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV); Jetisu region, Kerbulak district, Altyn-Emel pass, N 44 ° 12.606 ’, E 78 ° 30.392 ’, 1667 m a. s. l., 22.06.2023, 1 ♂, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV); Almaty region, Kegen district, ab. 4 km SE of Kegen, flood-lands of Kegen river, N 42 ° 59.65 ’, E 79 ° 16.47 ’, 1824 m a. s. l., 20.06.2023, 1 ♂, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV); Semipalatinskaja gub., 12.08.1895, 1 ♂, leg. I. V. Ingenitzkii (ZMMU); Semirech’je, B. Almatinka, 25.07.1928, 1 ♀, leg. Shnitnikov (ZIN); Uzbekistan: 1 ♂, Tashkent, Turkest. Expedition of A. P. Fedchenko, 1868 (ZMMU); Tashkent, 18.0?. 1871, 2 ♂, leg. A. Fedchenko (ZMMU). Kyrgyzstan: Issyk-Kul’, 28.07.1903, 1 ♀, (ZMMU); Suzak, 19.07.1935, 1 ♂, leg. D. Dovnar (ZMMU); Semirech’je, Issyk-Kul’, 15.07.1927, 1 ♀, leg. Zheludkova (ZMMU); Belovodskoe, 12.07.1935, 1 ♂ (ZMMU); Issyk-Kul’, river Chon, Kyzyl-Su, 31.08.1962, 1 ♀, leg. R. Zlotin (ZMMU).	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9E831FFF68B338F5C7FB7E.taxon	distribution	Distribution. The species inhabits the southern and south-eastern Kazakhstan and Central Asia. We can’t exclude the occurrence of this species in the north-western China.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9E831FFF68B338F5C7FB7E.taxon	description	Morphology. The males of C. angulatus can be distinguished from those of the C. albomarginatus group and of the new species by almost straight R vein of tegmen (Fig. 7 C). Thus, R field is relatively narrow in C. angulatus. This is the reason why the ratio of C + Sc areas width to R area width of tegmen is the largest in C. angulatus in comparison to C. karelini and the new species, despite this difference is not significant (Table, Fig. 5 B). The similar differences between C. angulatus and other species mentioned, but weaker, can be found in females (Table). Both sexes of C. angulatus differ from C. karelini and C. kegenicus by tegmen tapering towards the tip and frequent absence of stigma (Fig. 7 C, D). The structure of stridulatory file strongly differs between C. angulatus and C. karelini. In males of C. angulatus, the proximal pegs arrange in one row (Fig. 4 E), whereas they arrange in two or even three rows in C. karelini males. In the C. angulatus females, stridulatory pegs are well-developed (Fig. 4 F, 6 C), whereas they are thin and resemble the bristle stumps in the C. karelini females. The differences in stridulatory files between C. angulatus and C. kegenicus are relatively weak: the male proximal pegs arrange in a straight row in C. angulatus but in a slightly sinuous row in the new species.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9E831FFF68B338F5C7FB7E.taxon	biology_ecology	Calling song. The calling song of C. angulatus is a series of about 10 echemes lasting for 0.9 – 1.1 s and separated by intervals of 0.7 – 1.4 s (Fig. 8 A – C). Each echeme is composed of 19 – 25 syllables repeated at the rate of 22 – 40 / s. Oscillographic analysis shows that the legs produce a soft sound during upstroke and a louder pulse during downstroke. At the very beginning of every echeme, the legs are usually lifted higher, producing the first syllable slightly longer than the subsequent syllables (Fig. 8 C). Moreover, one leg is often moved higher than the other leg at the beginning of echeme, and the two legs change their roles on the next echeme. Nevertheless, the two legs are always moved synchronously. The calling song of C. angulatus strongly differs from the calling songs of C. kegenicus and C. karelini. The syllable number per echeme is about four times more in C. angulatus than in C. kegenicus; the syllable rate is at least three times higher in C. angulatus than in C. kegenicus. The calling songs of these two species are, however, similar in the echeme duration and period. The difference between the calling songs of C. angulatus and C. karelini is even stronger: the echeme duration is twice more in C. angulatus than in C. karelini, and the pulse rate within echeme is about 4 - 5 times less in C. angulatus, than in C. karelini. Courtship song. The courtship song starts with the small-amplitude movements of the hind legs, which generate short syllables repeated at the rate of about 5 / s (element 1, Fig. 8 D, E). The syllables contain 3 – 4 pulses of variable amplitude, which are only produced during synchronous down leg-movements. In about 0.5 – 1 min, there comes an element 2; in contrast to the element 1, it is produced by rather complex leg movements. Each leg alternate low- and high-amplitude movements, and the two legs are moved alternately: one leg produces the high-amplitude upstroke, whereas the other leg produces the low-amplitude upstroke. During the downstroke, both legs vibrate at the rate of 20 – 30 / s (Fig. 8 F). During the upstroke, a loud pulse of longer duration is generated; during the downstroke, several (2 – 4) short, quieter pulses are produced. The syllables are repeated at the rate of about 5 – 6 / s. The element 2 lasting from 3 to 15 s is followed by an element 3, which is similar to the calling echeme of C. angulatus. The leg movements are identical to those during the calling echeme, however, the sound syllables are much softer than during the calling song. The element 3 may include one echeme of the calling type or several echemes (Vedenina et al., 2020). Usually, the element 3 alternates with the element 2 for more than 1 min. The courtship songs between C. angulatus and C. karelini strongly differ. As it was written above, the courtship song of C. karelini includes five elements, which alternate in a very specific order. After a long alternation of the elements 1 and 2, the complex of three other elements is repeated two or three times, accompanied by visual display (the stroke by hind tibiae). By contrast, the courtship songs of C. angulatus and C. kegenicus have some similarities, despite they are clearly conspecific (Figs. 8, 10). The element 1 is similar in the songs of both species, but elements 2 and 3 are different both in the leg-movement patterns and the sound produced. In the element 2, the syllable rate and the pulse rate are higher in C. angulatus than in C. kegenicus. The element 3 in the C. angulatus courtship is similar to the calling song, which is produced by relatively simple leg movements, whereas the element 3 in C. kegenicus is the most complex element in terms of the leg movements.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9F831BFF68B475F7DBFCAE.taxon	materials_examined	Material examined: Holotype ♂: 9 Kazakhstan, Almaty region, Kegen district, ab. 4 km SE of Kegen, flood-lands of Kegen river, N 42 ° 59.65 ’, E 79 ° 16.47 ’, 1824 m a. s. l., 07.07.2016, leg. V. Vedenina & T. Pushkar (ZIN). Paratypes: same locality and date as holotype, 1 ♂, 1 ♀, leg. V. Vedenina & T. Pushkar (ZIN), song recordings in 1 ♂; same locality as holotype, 20.06.2023, collected as larvae, 8 ♂, 11 ♀, leg. V. Vedenina, N. Sevastianov & T. Tarasova (ZIN, CV), song recordings in 7 ♂; 10 Kazakhstan, Jetisu region, Panfilov district, ab. 6 km SW of Zharkent, N 44 ° 08.431 ’, E 79 ° 55.325 ’, 594 m a. s. l., 06.07.2016, 7 ♂, 2 ♀, leg. V. Vedenina & T. Pushkar (CV), song recordings in 3 ♂; same locality, 21.06.2023, 6 ♂, 6 ♀, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV); 11 Kazakhstan, Almaty region, Raiymbek district, environs of Tuyuq, N 43 ° 06.116 ’, E 79 ° 24.538 ’, 1925 m a. s. l., 21.06.2023, 3 ♂, leg. V. Vedenina, N. Sevastianov & T. Tarasova (CV), song recordings in 3 ♂. Kyrgyzstan: 12 southern beach of Issyk-Kul’, Tossor river mouth, N 42.175 °, E 77.395 °, 16.07.2013, 2 ♂, leg. D. Tishechkin (FSCB), song recordings in 2 ♂; 30.06.2024, 20 ♂, 3 ♀, leg. D. Tishechkin (ZMMU), song recordings in 4 ♂. Other material, excluded from type series: Turkestanskii krai, earlier than 1918, 1 ♂ (ZMMU); Kyrgyzstan: Issyk-Kul’, 17 km N of Przheval’sk, 02.08.1953, 2 ♂, 2 ♀, leg. D. Panfilov (ZMMU); environs of Issyk-Kul’, canyon Arashan, 17.08.1990, 2 ♂, leg. S. Dialektov (CV).	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9F831BFF68B475F7DBFCAE.taxon	description	Description. Head from above as wide as pronotum, 0.82 – 0.85 times as short as pronotum (Fig. 7 G, H). Foveolae distinct, visible from above, 2.8 – 3.75 times as long as broad. Antennae filiform, in ♂ extend slightly beyond hind coxa, in ♀ hardly reach hind margin of pronotum, its longest medial segments 2 – 2.6 times as long as wide. Pronotum with almost parallel lateral carina, ratio of max / min widths of pronotum less than 1.4; prozona nearly as long as metazona. Radial vein of tegmen clearly sinuate (Fig. 7 E, F). Stigma well developed. Tegmina projecting slightly beyond apices of hind knees. Tegmen in ♂ 4.5, in ♀ 5.1 times as long as wide on average. Alae slightly shorter than tegmina. The number of stridulatory pegs on the inner side of hind femur varies from 95 to 130 in ♂, from 89 to 117 in ♀. In the proximal part of the stridulatory file, the pegs arranged in a sinuous row very densely in ♂ (Fig. 4 G). The stridulatory pegs well-developed in both sexes. Tympanal organ in ♂ 2.3 times, in ♀ 2.8 times as long as wide on average. Cerci conical, in ♂ reaching margin of supra-anal plate, in ♀ reaching half of supra-anal plate. Subgenital plate in ♂ bluntly conical. Ovipositor short, without lateral teeth. Hind femur in ♂ 4.7, in ♀ 5 times as long as its maximum width on average. General colour brown, green forms not observed. Antennae of general colour, ventral side of apical segments commonly darker brown, particularly in ♂. Pronotum of general colour, in ♂ dorsum sometimes slightly darker, in ♀ lateral keels ventrally often bordered with dark sepia brown streak and exceptionally also with dark brown median keel. Tegmen in ♂ of general colour, in ♀ commonly costal area with white stripe, contrasting with darker brown Sc and often also R vein and sometimes darker brown coloured subcostal, medial and basal part of radial fields. Hind femur of general colour, in ♂ outer and particularly upper side or keels often darker brown towards the hind knee, in ♀ much less obvious. Hind knee in ♂ darker brown, especially upper lobe, in ♀ of general colour and often upper lobe only darker. Hind tibia of general colour, ventral side often dark brown, particularly towards the apex, more obvious in ♂. Hind feet of general colour, in ♂ often slightly paler, particularly third tarsus but not white. Measurements (in mm). Body length ♂ 15 – 18, ♀ 20 – 24; pronotum length ♂ 2.9 – 3.5, ♀ 3.6 – 4.9; tegmen length ♂ 9.5 – 12.4 ♀ 11.6 – 15.5; tegmen width ♂ 2.1 – 2.8, ♀ 2.2 – 2.9; femur length ♂ 8.3 – 10.2; ♀ 10.6 – 14.2; femur width ♂ 1.8 – 2.2, ♀ 2.1 – 2.8; peg number in ♂ 95 – 130, in ♀ 89 – 117.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9F831BFF68B475F7DBFCAE.taxon	etymology	Etymology. This species is named from the type locality in the environs of the Kegen village, in the flood-land of the Kegen river.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9F831BFF68B475F7DBFCAE.taxon	description	Morphology. The new species can be distinguished from C. karelini by the significantly smaller number of stridulatory pegs: the peg number varies from 95 to 130 in the C. kegenicus males, whereas the peg number varies from 140 to 188 in the C. karelini males. Moreover, the proximal pegs are arranged in one row and more densely in the C. kegenicus males, whereas the pegs are arranged in two or even three rows, and the pegs are organized relatively widely in the C. karelini stridulatory file (Fig. 4). In another species relative to C. karelini, C. albomarginatus, the male pegs also form one straight row. However, C. albomarginatus does not occur in Kazakhstan, inhabiting more northern territories. Thus, distinguishing C. kegenicus from C. albomarginatus is not so relevant. The females of C. kegenicus differ from the females of both C. albomarginatus and C. karelini by the well-developed stridulatory pegs. This feature, however, does not allow distinguishing the females between C. kegenicus and C. angulatus. On the proximal third of stridulatory file, the pegs are arranged in a sinuous row in the C. kegenicus males but in a straight row in the C. angulatus males (Fig. 4 E, G). The R vein of tegmen is clearly sinuate in the C. kegenicus males but straight in the C. angulatus males, and stigma is well developed in both sexes of C. kegenicus but is often absent in both sexes of C. angulatus (Fig. 7 C – F).	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
03838780FF9F831BFF68B475F7DBFCAE.taxon	biology_ecology	Calling song. As a rule, a male of C. kegenicus produces from 6 to 11 echemes separated by intervals of 0.7 – 1 s (Fig. 9). Each echeme lasts for 0.7 – 1 s and consists of 5 – 6 syllables repeated at the rate of about 7.5 / s. The syllable duration varies in the range of about 130 – 190 ms. Each syllable starts with a short and loud pulse, followed by a very soft buzzing sound. Oscillographic analysis shows that the loud pulse is produced by the strong downstroke of usually one leg and the soft sound is produced by the low-amplitude vibrations of both legs (Fig. 9 C). The two legs are often moved asynchronously and change their roles in producing the loud pulse from syllable to syllable. The calling song of C. kegenicus greatly differs from those of C. angulatus and of the species of the C. albomarginatus group, which was written above. Courtship song. The courtship song of C. kegenicus starts with the synchronous, small-amplitude movements of the hind legs, which generate quiet syllables repeated at the rate of 3.5 – 6 / s (element 1; Fig. 10 A). The loudest component of the syllables is generated by the down leg movements. In about 0.2 – 1 min, there comes an element 2: each second syllable starts to be produced by synchronous high-amplitude stroke of the legs (Fig. 10 A, C). As a result, a short loud pulse is produced at the rate of 3 – 3.5 / s. The element 2 lasting from 5 to 30 s is followed by an element 3, which is generated by rather complex leg movements (Fig. 10 D, E). Each leg alternates 3 – 4 low-amplitude and one high-amplitude movements, and superimposed on high-amplitude movements are small-amplitude vibrations. Notably, a louder sound is produced during the low-amplitude leg movements and at the beginning of each high-amplitude stroke. The loud pulse at the beginning of each high-amplitude stroke is produced by only one leg, and the two legs alternate their roles (Fig. 10 E). In the developed courtship, the element 2 (lasting about 5 – 10 s) and the element 3 (lasting about 3 – 4 s) may alternate for more than 1 min. Sometimes, the element 2 is preceded by the short element 1, so the complex of elements 1 - 2 - 3 may be repeated many times for two minutes or more. It is remarkable that not a single element of the courtship song resembles the calling song in C. kegenicus, which differs this species from both C. angulatus and C. karelini. The courtship songs between C. kegenicus and C. karelini differ greatly, which was mentioned above. The difference in the courtship songs between C. kegenicus and C. angulatus is less striking, although the syllable periods and the temporal structure of syllables in the elements 2 and 3 are quite different.	en	Vedenina, Varvara, Tishechkin, Dmitry, Kovalyova, Evgenia, Sevastianov, Nikita (2025): A new species of the subgenus Chorthippus Fieber, 1852 (Orthoptera: Acrididae: Gomphocerinae: Chorthippus) from Kazakhstan and Kyrgyzstan, closely related to C. angulatus Tarbinsky and C. karelini (Uvarov). Zootaxa 5653 (2): 246-262, DOI: 10.11646/zootaxa.5653.2.5, URL: https://doi.org/10.11646/zootaxa.5653.2.5
