Gryllus (Gryllus) bimaculatus De Geer, 1773

Sultana, Riffat, Sanam, Surriya, Kumar, Santosh, R, Sheik Mohammad Shamsudeen & Soomro, Fakhra, 2021, A review of Gryllidae (Grylloidea) with the description of one new species and four new distribution records from the Sindh Province, Pakistan, ZooKeys 1078, pp. 1-33 : 1

publication ID	https://dx.doi.org/10.3897/zookeys.1078.69850
publication LSID	lsid:zoobank.org:pub:573D4067-16A2-4E20-859D-354DFAF83B4D
persistent identifier	https://treatment.plazi.org/id/577137E1-D482-5BCB-8230-C2D70E0C80E8
treatment provided by	ZooKeys by Pensoft
scientific name	Gryllus (Gryllus) bimaculatus De Geer, 1773
status

Treatment

Figures 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 , 9 View Figure 9 , 10 View Figure 10 , 11 View Figure 11

Material examined.

Pakistan, Sindh Prov. • 5♂, 4♀; Surriya, Riffat ; 21 Aug. 2019; Mithi 24.7436°N, 69.8061°E GoogleMaps , 2♀; Riffat; Naushahro feroze 26.8463°N, 68.1253°E, 3♂, 4♀; Riffat, Surriya ; 12 Sep. 2020; Chachro 25.1156°N, 70.2557°E GoogleMaps , 4♂, 8♀; Surriya, Riffat ; 19 Sep. 2020; Umerkot 25.3549°N, 69.7376°E GoogleMaps , 2♀; Riffat ; 20 Aug. 2020; Nara 34.6851°N, 135.8048°E GoogleMaps , 6♂, 16♀; Surriya ; 24 Aug. 2020; Nagarparkar 24.3572°N, 70.7555°E GoogleMaps , 6♂, 11♀; Riffat, Surriya ; 23 Aug. 2020; Tharparkar 24.8777°N, 70.2408°E GoogleMaps , 1♂, 3♀; Riffat ; 26 Aug. 2020; Sanghar 26.0436°N, 68.9480°E GoogleMaps , 3♂, 8♀; Riffat, Surriya ; 27 Aug. 2020; Islamkot 24.7014°N, 70.1783°E GoogleMaps .

Description.

Large size, stout. Colour blackish. Head curved feebly at anterior; wider at posterior (Fig. 1D, E View Figure 1 ). Pronotum concave with piriform impression on anterior disc (Fig. 4D, E View Figure 4 ). Elytra reach to the top of abdomen, wings much long (Fig. 8D, E View Figure 8 ). Legs dark brown and strongly pubescent (Fig. 1D, E View Figure 1 ). Posterior femora rather thick, dark brown with rufous base; posterior tibia with eight spines on superior margin (Fig. 6D, E View Figure 6 ). Ovipositor rather long and slender, feebly curved with very narrow, smooth, acute apical valves (Fig. 1D, E View Figure 1 ).

Male: LH 2.25 ± 0.15 (mm), LP 3.45 ± 0.057 (mm), LT 4.1 ± 1.5 (mm), LF 14.5 ± 0.57 (mm), LT 11.0 ± 1.15 (mm), LT 4.2 (mm), TBL 22.5 ± 0.57 (mm) Female: LH 4.76 ± 0.74 (mm), LP 4.66 ± 0.35 (mm), LT 4.5 ± 1.63 (mm), LF 15.33 ± 0.57 (mm), LT 11.66 ± 0.816 (mm), LO 18.5 ± 0.57 (mm), TBL 16 ± 3.05 (mm).

Ecology.

This species frequently occurred in the field. Plants affected by this species are Tritium aestivum (wheat), Oryza sativa (rice), Sacharum officinarium (sugarcane), and Echinochloa colonum (jungle rice). This species is hemimetabolous and moults 8-11 times to become adult (pers. obs.).

Global distribution.

Ukraine, France, Spain, USA, India, West Bengal, Kashmir, Pakistan, Mali ( Cigliano et al. 2020).

Remarks.

Gryllus bimaculatus is variable in size with colour variations. During this study we collected this species from dry parts of Nagarparkar and confirm its presence in dry barren areas. Chopard (1969) reported that G. (Gryllus) bimaculatus causes severe damage to potato plants.