Tetranychus lintearius Dufour 1832

Tetranychus lintearius Dufour 1832 View in CoL

Tetranychus lintearius Dufour, L., 1832 , 25: 276.

Tetranychus lintearius Dufour, 1832 View in CoL : Van Eyndhoven, G.L.,

1967, 27: 90 - 100.

Tetranychus lintearius Dufour, 1832 View in CoL : Seeman, O.D. and Beard,

J.J., 2011, 2961:1 - 72. into 6 proximoventral hairs with prominent dorsomedian spurs. Spinneret length and width 2:1 (6–8 x 3–4).

Material examined: 13 females (Acarol. lab/ BCKV /4661- 73/61) and 9 males (Acarol. lab/ BCKV /4673-81/73) collected from amaranthus, Amaranthus cruentus L. ( Amaranthaceae ) Block Seed Farm, BCKV, Kalyani (22° 58’ 30’’ N, 88° 26’ 4’’ E), Nadia, West Bengal, 27 th May, coll. Subhra Samanta.

( Figures 27-35 View Figures ; 36-39 View Figures ; 60-62 View Figures )

Diagnosis: Male: Empodia of leg I-IV with free proximoventral hair, appearing tridigitate with prominent mediodorsal spur. Tarsus I bears 4 tactile setae and 2 solenidia proximal to the proximal duplex setae. Palpfemur setae d PFe forming a clavate-shaped structure. The aedeagal knob has both anterior and posterior projections with a pointed posterior tip, dorsal margin of the knob is irregular which forms an angle of 62 o with the shaft.

Female: Striation pattern between setae e1-f1 forming a diamond-shaped pattern. Striation in the pregenital region is longitudinal, oblique and continuous. Peritreme hook length 29-33. Tarsus I with 4 setae positioned behind proximal duplex setae. Empodia of each leg split Female: ( Figures 27-35 View Figures , 60, 61 View Figures ). Dorsum ( Figure 27 View Figures ): Length of the idiosoma 403-441, width at the level of c setae 350-381, propodosoma set with longitudinal striation forms a semicircular lobe. Histerosomal striation between setae e1-f1 forms a diamond-shaped pattern. Length of dorsal setae: v2 66-79, sc1 138-157, sc2 85-100; c1 113-137, c2 99-115, c3 89-101, d1 117-132, d2 113-125, e1 115-123, e2 109-119, f1 112-123, f2 61-72, h1 46-54. Distance between dorsal setae: v2-v2 63-71, v2-sc1 25-31, sc1–sc2 88-96, sc1-sc1 65-73, sc2-sc2 233-253, c1-c1 65-73, c1-c2 43-51, c2-c3 63-71, c2-c2 166-178, c3-c3 282-297, d1-d1 71-80, d1-d2 77-85, d2-d2 194-208, c1-d1 59-70, c3-d2 76-86, e1- e1 53-63, e1- e2 51-61, e2-d2 72-84, e2- e2 155-167, f1-f1 53-63, f2-f2 101-111, f1-f2 57-65, f1-d1 144-156, h1-h1 28-34.

Venter ( Figures 28 View Figures , 61 View Figures ): Ventral setae slender, smooth. Lengths: 1a 45-51, 1b 62-68, 1c 64-72, 2b 62-68, 2c 61- 69, 3a 57-65, 3b 54-62, 4a 73-81, 4b 67-75, ag 65-71, g1 29-35, g2 26-32, ps1 15-17, ps2 18-20, h3 36-42. The striation pattern in the pregenital region is longitudinal and continuous. Distance between intercoxal setae: 1a - 1a 29-35, 3a-3a 65-71, 4a-4a 79-89, ag-ag 74-80, g1-g1 48-56, g2-g2 107-120, g1-g2 32-38, ps1-ps1 33-37, ps2-ps2 27-31, h3-h3 95-106.

Gnathosoma ( Figures 29, 30 View Figures , 60 View Figures ): Stylophore rounded, with only longitudinal striations. Peritreme distally hooked, hook length 29-33; palpfemur, palpgenu with 1 seta only, palpfemur d PFe 33-39, palpgenu l’’ PGe 29-35, palptibia with 3 setae and d PTi 12-16, l’ PTi 9-13, l” PTi 18- 23 and a claw; palptarsus (length 10-12, wide 9-11) with 3 setae a 8-10, b 7-9, c 8-9); 1 spinneret suζ length 6-8 width 3-4; 1 solenidion ω 6-8; 2 eupathidia ul’ζ 9-11, ul”ζ 11-12. Spinneret length is slightly shorter than 2 eupathidia. The ratio of length and width of the palptarsus is equal.

Leg ( Figures 31-35 View Figures ): Leg I length 295-320, leg II length 229-246, leg III length 233-260, leg IV length 301-325 (from trochanter to tarsus). Setal pattern on leg I–IV coxa 2-2-1-1, trochanter 1-1-1-1, femur 10-6-4-4, genu 5-5-4- 4, tibia 9 (1) -7-6-7, tarsus 13(1) +2 duplex setae- 13(1) + 1 duplex setae-9 (1) - 10 (1). Tarsi I with 10 tactile setae, 3 eupathidia, 1 solenidion and 2 sets of proximal duplex setae, 3 proximal tactile setae and 1 solenidion proximal to proximal duplex setae; tarsus II with 9 tactile setae, 3 eupathidia, 1 solenidion, 1 set of duplex setae, 1 tactile seta adjacent to duplex setae; tarsi III and IV each having 9 tactile setae and 1 solenidion. Empodia of leg I–IV each with a spur and split into 3 pairs of hairlike structures known as proximoventral hair.

Male: ( Figures 36-39 View Figures , 62 View Figures ). Aedeagus ( Figures 39 View Figures , 62 View Figures ): In the aedeagal knob having both anterior and posterior projections with a pointed tip, the dorsal margin of the knob is irregular, the main shaft maximum length is 14- 16, the maximum width is 7-9, maximum neck length 2-3, neck width 1-2, head length 2-3, axis of the head forming angle with the shaft 62 o.

Leg ( Figures 36, 37 View Figures ): Tarsus I with 10 tactile setae, 3 solenidia, 3 eupathidia, and 2 sets of duplex setae. Tarsus I bears 4 tactile setae and 2 solenidia proximal to the proximal duplex setae. Tibiae I with 4 solenidia 9 tactile setae. Tarsus II with 10 tactile setae, 1 solenidion, 3 eupathidia, and 1 set of duplex setae. Tibiae II with 7 tactile setae. Empodia split with a prominent spur.

Gnathosoma ( Figure 38 View Figures ): Palpal setation from femur to tibiae d PFe 7-9, l’’ PGe 19-21, d PTi 20-22, l’ PTi 10- 12, l” PTi 11-13. Palpfemur setae d PFe modified into a clavate-shaped structure. palptarsus length 11-13, wide 10-12; palptarsus with 3 setae a 8-10, b 9-11, c 9-10, 1 spinneret suζ (length 4-6, wide 2-3), 1 ω solenidion 4-6 and 2 eupathidia ul’ζ 6-8, ul”ζ 7-9. Spinneret length and width ratio 2:1.

Remarks: This species was described by Dufour, in 1832 from France on Ulex europaeus . We have identified the species Tetranychus lintearius Dufour, 1832 from Amaranthus , Amaranthus cruentus L. ( Amaranthaceae ) by comparing the structure of aedeagus, tarsus of leg I and II mainly the number of setae proximal to the proximal duplex setae, pregenital striation pattern of female and shape of dorsal palp femoral seta. A detailed complimentary description of the species has been provided in addition to earlier descriptions and illustrations. Seeman and Beard, 2011 stated that the peritreme hook length of females is 19–22 but here peritreme hook length is 25–27. We have redescribed the species with proper measurements. This species is reported for the first time from India.