Tarbinskiellus terrificus ( Walker, 1869 )

Gupta, Sunil Kumar, 2017, First record of Tarbinskiellus terrificus (Walker, 1869) (Grylloidea: Gryllidae) from Central India, Records of the Zoological Survey of India 117 (1), pp. 34-34 : 34-

Tarbinskiellus terrificus ( Walker, 1869)

1869. Brachytrypes terrificus Walker, Cat. Derm. Salt. Brit. Mus .,:10. 2010.

Tarbinskiellus terrificus Shishodia et al. , Rec. zool. Surv. India, Occ. Pap, 314: 245.

Material examined: Chhattisgarh; Raipur, Barnawapara WLS, Barnawapara Camp , (21°24’000’’ N, 82°25’312’’ E), 321 m a.s.l., 14.vi.2012, 1♀,NC, coll. S. K. Gupta & party, Reg. No. 14055/H5 ; Gariaband; Udanti WLS; Ganga Jamuna Village , (20°17’24.5’’ N, 82°15’12.2’’ E), 495m a.s.l., 28.vi.2014 1♂,NC, coll. S. K. Gupta & party, Reg. No. 14056/H5 .

Description: Size large Figure (1A, B).

Head: Head as wide as pronotum with dense bristles ( Fig 1C ). Vertex flat, convex. Eyes large protruding. Ocelli locate in triangle. Median ocelli more than twice as wide as lateral ocelli. Distance between lateralocelli slightly longer than the distance between one lateral and the median ocelli. Maxillary palpi large, joints 1 and 2 subequal; joint 3 the longest, joint 5 slightly short and widened from base.

Pronotum: Pronotum 1.6 times wider than the length in dorsal view ( Figure 1D ), transverse; anterior margin concave, posterior margin slightly straight and wider than anterior margin; anterior margin with dense bristles, lateral lobe of pronotum ventral margin straight. Mesosternum rectangular; metasternum broader than mesosternum, pentagonal form.

Male Wings: Fore wings covering tip of abdomen ( Figure 2E ). Stridulatory file complete, more than 41stridulatory teeth ( Figure 2H ); 1A-4A, first to fourth anal veins; 1A, slightly bisinuated; posterior cubitus presents; harp crossed by 4, almost transverse veins; mirror rather long, with dividing vein; chords strongly curved; apical area well netted, more than 2 times longer than the mirror area; apical field with 3-9 cell alignments posterior to mirror; Lateral field with 7-13 projections of subcosta. Hind wings long, 1.5 times as long as tegmen.

Legs: Fore legs: Clothed with bristles; femora 2.9 times as long as wide, cylinder, tibiae with a large elongated external tympanum and internal small, ovoid tympanum ( Figure 2A ). 1 outer apical spur, short, 2 inner apical spurs, of which one long and one some short, wide at base, acute at apex. III tarsal segment slightly longer than first.

Mid legs: Clothed with bristles but shorter than fore legs, cylinder; femora 4 times as long as wide, tibiae with 4 apical spurs, outer one spur 1.4 times longer than dorsal and inner spurs ( Figure 2 C ); dorsal and inner spurs slightly subequal. III tarsal segments 1.3 times longer than first.

Hind legs: Femora 3.4 times as long as wide, and 2.4 times longer than the middle femora; basal part dilated; dorsal and ventral margin slightly hairy; dorsal and median external area glabrous; tibiae clothed with bristles but shorter than fore legs, with 5 outer subapical spurs and 4 inner subapical ( Figure 2D ); except for the 4 apical spurs; outer IInd spurs longest, stout, tip acute and straight, Ist some curved and tip more acute, inner spurs subequal together; basitarsus 1.2 times longer than the combining length of the remaining two apical tarsomeres; furrowed dorsally; with outer margin 3 denticles and inner margin 5 denticles or spines; 2 apical spurs of basitarsus, inner apical basitarus spur 2.7 times longer than outer basitarsus spur, straight, stout and acut tip ( Figure 2F ).

Abdomen: Abdomen 1.4 times shorter than the hind femur. Subgenital plate with dense bristles, setose; basal part wide and apically triangulate; 1. 2 shorter than its width acute ( Figure 2B ). Cerci male 1.4 times longer than the hind femur ( Figure 3D ). Ovipositor short, straight ( Figure 2G ).

Male Genitalia: Ectoparamere large. Virga slightly large and stout. Ectoparameres process notch like, tip acute, large ( Figure 3C ).

Measurements: (all in millimetres).

Male Body length: (from the tip of the vertex to tip of subgenital plate): 40.32. Compound eye length: 2.88, width: 2.15.

Antennal length: 30.56. Antennal socket length:1.47; Scapes length:1.649, Pedicel length: 0.347.

Pronotum length: 7.653, width: 12.667. Abdomen length: 16.154.

Fore leg: femur length: 9.198, width: 3.111; tibia length: 10.315, width: 2.356;outer Tympanum length: 1.369; width: 0.532; outer spur length: 1.689; inner spur length:2.141; tarsus length (by segments) I: 2.036, II: 0.840, III: 2.113; claw length I: 0.976; II:0.895.

Mid leg: femur length: 9.381, width: 2.219, tibia length: 10.055, width: 1.419; Outer spur length: 1.334; middle spur length: 0.810; inner spur length: 0.949, tarsus length: I: 1.930, II: 0.231, III: 2.520; claw length 1.148.

Hind leg: femur length: 22.976, width: 6.754, tibia length: 13.428, width: 1.336, tarsus length: I: 5.306, II: 0.915, III: 3.222, claw length I: 800, II:822.

Wings: tegmina length 30.278, width 10.072; Hind wings length 42.224, length between apex of pronotum to apex of alae 1.03.

Subgenital plate: length in ventral aspect length: 2.340, width: 3.060; cerci length: 16.202, width: 1.276.

Female: Body length ( Figure 3A,B ) (from the tip of the vertex to tip of subgenital plate): 33.228;

Abdomen length: 12.218. subgenital plate in ventral aspect length: 2.479, width: 3.345; ovipositor in ventral aspect lower valvue length: 1.954.

Colouration: Body colour bright rufous, tegmina dark brown, legs and pronotum bright rufous, fore legs and mid legs with small white dots, hind femur glabrous and bright rufous, hind knee dark chocolate.

Distribution: India: Chhattisgarh, Karnataka and Tamil Nadu.

Figures

Figures 1. A. T. terrificus (Walker, 1869) male, lateral view; B. dorsal view; C. Head and antenna (Frontal view); D. Pronotum dorsal view.

Figures 2. A. Fore tibiae show tympanum (external view); B. male subgenital plate; C. Mid tibiae (external view); D. hind tibiae (external view); E, tegmina show mirror; F, hind tarsal; G, Femaleovipositor (ventral view); H, Stridulatory file.

Figures 3. A. T. terrificus (Walker, 1869) Female, lateral view; B. dorsal view; C. male genitalia; D. Male live ventral view.