Xenogryllus maichauensis Gorochov, 1992

Jaiswara, Ranjana, Dong, Jiajia, Ma, Libin, Yin, Haisheng & Robillard, Tony, 2019, Taxonomic revision of the genus Xenogryllus Bolívar, 1890 (Orthoptera, Gryllidae, Eneopterinae, Xenogryllini), Zootaxa 4545 (3), pp. 301-338 : 315-323

publication ID

https://doi.org/ 10.11646/zootaxa.4545.3.1

publication LSID

lsid:zoobank.org:pub:A6A7B9CE-9905-4DA7-8011-747D4B9325F7

persistent identifier

https://treatment.plazi.org/id/6A6AC46E-CE0B-FFE3-E9AB-F931FE68FC7E

treatment provided by

Plazi

scientific name

Xenogryllus maichauensis Gorochov, 1992
status

 

Xenogryllus maichauensis Gorochov, 1992 View in CoL

( Figs 1 View FIGURE 1 L–O, 3E–F, 4C, 5C, 7L–N, 8D, 9C, 10B, 11E–G, 12A, 13)

Xenogryllus maichauensis Gorochov, 1992: 9 View in CoL —Kim & Pham 2014: 60; Cigliano et al. 2018 ( Orthoptera View in CoL Species File Online); Jing et al. 2018: 274.

Xenogryllus transversus View in CoL — Yin & Liu 1995: 96; Robillard et al. 2007: 1267 (song frequency, wrong identification); He 2018: 516; Cigliano et al. 2018 ( Orthoptera View in CoL Species File Online) (wrong identification).

Type material. Holotype, ♂, Vietnam: Mai Châu ( ZIN) [examined].

Additional material examined. China: Yunnan GoogleMaps , Mengla, E101°33’ N21°28’, 3.ix.1991, Zuyao Liu, Tianqi Wang   GoogleMaps & Heisheng Yin   GoogleMaps : 1♂ (14062446), 2♀ (14062547, 14062622) (SIPPE). Mengla Distr. , 12–23.x.2014, coll. Zhang Tao, 14♂, 2♀, ( SNNU) . San Chahe, Mongyang, E98°22’ N25°23’, 31.vii.1995, Xianwei Liu , Weinian Zhang , Xingbao Jin , 1♂ (14062620) ( SIPPE) GoogleMaps . Xi Shuang Ban Na, 580 m, 10.ix.1993, Xinyue Chen , 3♂, (14064963, 14064964, 14064966); 2♂, 7.ix.1993 (14064968, no number); 1♂, 5.ix.1993 (14064967) ( SIPPE) . Monglun Xi Shuang Ban Na, E101°15’ N21°56’, 5.ix.1993, Longlong Yang, 2♀, (14064969, 14064971); 7.ix.1993, Xinyae Chen , 1♀ (14064970) ( SIPPE) GoogleMaps . Jinhong, E 101°15’ N21°56°, Zuyao Liu, Tianqi Wang , Heisheng Yin : 6.ix.1991, 3♂ (14062619, 14062546, 14062448); 8.ix.1991, 1♂ (14062447) ( SIPPE) . Jinghong, [N22°0'6.97" 100°46'25.07"E], 9.ix.1991, Zuyao Liu, Tianqi Wang , Heisheng Yin , 1♀ (14062449) ( SIPPE) GoogleMaps . Mohan Vill. , 950 m, 3-ix.2005, coll. Xue Guoxi, 2♂ ( NWAFU) . Guangdong, Shen zhen, [22°33'59.69"N, 114° 2'25.53"E], 9.x.2012, Zhang Tao [online photograph] GoogleMaps . Thailand: Tak, Doi Musoe, 700 m, Agric. Res. Stn at night, 9.x.1990, S. Ingrish : 1♀, 1♂, molecular sample XtrTh, identified Xenogryllus transversus by S. Ingrish ( ZFMK) . Mae Salid, Monkrathing, 17°30' N, 98°5' E, 700 m, 19.ix.1989 – 21.ix.1989, S. Ingrisch , 1♂, mountain forest and agricultural land [day collecting and night collecting following stridulation, Stridulation recorded by S.Ingrisch 0295DXEN.WAV [old ID CIGxentraSW03], identified Xenogryllus transversus by S. Ingrish ( ZFMK) GoogleMaps . Umphang, 1–6 km S., 15° 59' N, 98° 50' E, 16.x.1991, S. Ingrisch , 1♂, bamboo forest, along road and trails, stridulation recorded by S. Ingrisch 0510XENO.WAV, identified Xenogryllus transversus by S. Ingrish ( ZFMK) GoogleMaps . Chiang Mai, Roadside bw Samoeng and Mae Rim , 18°50'N, 99°0°, 1♂, 11.x.1991, S. Ingrisch , 1♂, stridulation recorded by S. Ingrisch 0502XENO.WAV, [old ID CIGxentraSW05], roadside at night, identified Xenogryllus transversus by S. Ingrish ( ZFMK) . Petchabun, Nam Nao, 16°47'N, 101°27'O, 1000 m, S. Ingrisch; 13.ix.1989 – 14.ix.1989, S. Ingrisch, 1♂, stridulation recorded by S. Ingrisch 0286XENO.WAV [old ID CIGxentraSW01], mixed Oak-Pine forest , grassy undergrowth, Bamboo thicket [day collecting and night collecting following stridulation], identified Xenogryllus transversus by S. Ingrish ( ZFMK) GoogleMaps .

Type locality. Mai Châu , Vietnam .

Distribution. Southern China, Northern Vietnam and Northern Thailand.

Emended diagnosis. Species of large size, similar in size, venation and coloration to X. transversus , from which it differs mostly by male genitalia, with pseudepiphallic lophi forming curved elongate hooks widened apically ( Fig. 8D View FIGURE 8 ), while lophi are straight in X. transversus ( Fig. 8I View FIGURE 8 ).

Redescription. In addition to the characters of the genus, X. maichauensis has a large size and a light brown or golden coloration ( Fig. 1 View FIGURE 1 L–O). Fastigium slightly widened apically as in X. ululiu and X. transversus ( Fig. 4C View FIGURE 4 ). Eyes rather small, located on face, restricted to the dorsal third of head in lateral view ( Fig. 3 View FIGURE 3 E–F). Lateral angle of dorsal disc of pronotum not carinated, with a thin yellow band underlined by a thin black line anteriorly. Hind wings tail gray brown, twice as long as pronotum.

Male. Pronotum dorsal disc more rectangular than in X. transversus , with a wide black median longitudinal band, its posterior margin slightly bisinuate. FW venation ( Fig. 5C View FIGURE 5 ): 1A forming a straight angle, with 299 stridulatory teeth (n=1) located on transverse part of 1A. Dark coloration anterior to 1A not including angle of file. Harp wide. Mirror large, well-rounded, its inner limit curved. Apical field forming a triangle longer than wide, with six cell alignments.

Male genitalia ( Fig. 7 View FIGURE 7 L–N): Characteristic Y-shaped pseudepiphallic lophi forming curved elongate hooks, widened apically, with a sharp dorsal preapical expansion ( Fig. 8D View FIGURE 8 ). Rami strong, convergent apically, with a ventral posterior expansion reaching base of pseudepiphallic lateral membranous lobes. Ectophallic apodemes long and thin. Ectophallic fold and endophallic sclerite almost fused, forming a wide sclerotized plate, trifurcate posteriorly; endophallic apodemes made of wide lateral lamellas.

Female: Head slightly wider than pronotum, with strong jaws visible from dorsal view ( Fig. 1 View FIGURE 1 N–O). Dorsal disc of pronotum almost rectangular, its posterior margin slightly bisinuate. FWs light brown, anterior dark spot larger than in X. ululiu , X. transversus and X. marmoratus . Dorsal field with nine strong longitudinal veins. Subgenital plate with a V-shaped apical indentation with rounded edges ( Fig. 9C View FIGURE 9 ). Ovipositor ( Fig. 10B View FIGURE 10 ) as long as FIII.

Female genitalia: Copulatory papilla ( Fig. 11 View FIGURE 11 E–F) conical, its apex rounded and sclerotized.

Life history traits. In Vietnam, the type specimens were found in forest, on leaves of bushes near a stream (A. Gorochov, pers. comm.). According to the information associated with the recordings made by S. Ingrish in Thailand available on the Orthoptera Species Files online under the name X. transversus ( Cigliano et al. 2018) , the species was found in mixed oak-pine forest on grassy undergrowth with bamboo thicket. Males call at night on vegetation.

Calling song. ( Figs 12A View FIGURE 12 , 13 View FIGURE 13 ) X. maichauensis was recorded in Thailand by S. Ingrish ( Cigliano et al. 2018). At 24.5°C, the calling song is made of short echemes quickly repeated and composed of 2–4 long syllables (m = 3.02 ± 0.63), lasting for 179.5 ± 41.6 ms, with a period of 502 ± 42 ms. Within echemes, the first syllable has a lower amplitude than the next ones. Syllables are rather long (duration = 46.5 ± 1.7 ms) with a syllable period of 65.1 ± 1.7 ms (syllable duty cycle = 71%). The frequency spectrum shows a dominant frequency at 4.91 ± 0.07 kHz followed by two powerful harmonics.

Measurements. See Table 4.

Taxonomic discussion. The male genitalia of the specimen from Thailand shows slightly different pseudepiphallic lophi compared to the holotype from Vietnam and examined males from China, with more straight apical branches and less globular apex ( Fig. 7 View FIGURE 7 L–M). Such differences are however based on too few observations to characterize a new species.

ZIN

Russian Academy of Sciences, Zoological Institute, Zoological Museum

ZFMK

Zoologisches Forschungsmuseum Alexander Koenig

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Orthoptera

Family

Gryllidae

Genus

Xenogryllus

Loc

Xenogryllus maichauensis Gorochov, 1992

Jaiswara, Ranjana, Dong, Jiajia, Ma, Libin, Yin, Haisheng & Robillard, Tony 2019
2019
Loc

Xenogryllus transversus

Robillard, T. & Grandcolas, P. & Desuter-Grandcolas, L. 2007: 1267
Yin, H. & Liu, X. W. 1995: 96
1995
Loc

Xenogryllus maichauensis

Jing, X. & Zhang, T. & Ma, L. 2018: 274
Gorochov, A. V. 1992: 9
1992
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