Tetranychus urticae Koch, 1836

Tetranychus urticae Koch, 1836 View in CoL

Tetranychus urticae Koch, 1836: 10 View in CoL .

Tetranychus telarius View in CoL (L.), Pritchard and Baker, 1955, 9 (2): 422.

Tetranychus urticae Koch, 1836 View in CoL . Seeman, O.D. and Beard, J.J.,

2011, 2961: 1 - 72.

( Figures 40-48 View Figures ; 49-52 View Figures ; 63-66 View Figures )

Diagnosis: Male: Empodia of legs I and II split into proximoventral hairs each with a prominent spur. Tarsus I bears 4 tactile setae and 2 solenidia proximal to the proximal duplex setae. Palpfemur setae d PFe forming a claw-like structure. The aedeagal knob has both anterior and posterior projections, and the dorsal margin of knob is convex which forms an angle of 50 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 14-16. Tarsus I with 4 setae positioned behind proximal duplex setae. The Empodia of each leg split into 6 proximoventral hairs. Dorsomedian spurs are absent. Spinneret length and width 7–8 x 6–7.

Material examined: 12 females (Acarol. lab/BCKV/4561- 72/61) and 10 males (Acarol. lab/BCKV/4372-81/72) collected from sponge gourd, Luffa aegyptiaca Mill. ( Cucurbitaceae ) Block Seed Farm, BCKV, Kalyani (22° 58’ 30’’ N, 88° 26’ 4’’ E), Nadia, West Bengal, 27 th April, coll. Subhra Samanta.

Female: ( Figures 40-48 View Figures , 63-64 View Figures ). Dorsum ( Figure 40 View Figures ): Length of the idiosoma 442-467, width at the level of c setae 313-337, propodosomal striation forming a semicircular lobe. Histerosomal striation transverse medially and longitudinal posteriorly, between e1-e1 and f1-f1 striation pattern longitudinal or oblique, striation between dorsocentral setae e1-f1 forming a diamond-shaped pattern. Length of dorsal setae: v2 61-69, sc1 122- 136, sc2 85-96, c1 117-130, c2 112-125, c3 101-111, d1 124 119-128, d2 105-114, e1 110-119, e2 89-99, f1 92-101, f 2 78-86. Distance between dorsal setae: v2-v2 55-63, v2 -sc1 27-32, sc1–sc2 64-72, sc1-sc1 72-80, sc2-sc2 188-205, c1-c1 63-72, c1-c2 49-58, c2-c3 44-50, c2-c2 156-168, c3-c3 247- 259, d1-d1 64-72, d1-d2 67-75, d2-d2 185-197, c1-d1 58- 66, c3-d2 70-78, e1- e1 52-60, e1-e2 87-95, e2- d2 63-71, e2-e2 198-212, f1-f1 55-63, f2-f2 72-80, f1-f2 52-60, f1-d1 115-126.

Venter ( Figures 41 View Figures , 64 View Figures ): Ventral setae slender, smooth. Lengths: 1a 58-67, 1b 65-73, 1c 52-58, 2b 79-87, 2c 76- 83, 3a 59-65, 3b 52-58, 4a 75-83, 4b 63-70, ag 72-80, g1 38-44, g2 36-40, ps1 15-19, ps2 19-23, h2 40-43, h3 42-48. Striation pattern between intercoxal region simple and transverse; striation in the pregenital region longitudinal and continuous. Distance between intercoxal setae: 1a -1a 43-48, 3a -3a 83-90, 4a -4a 87-94, ag -ag 93-100, g1-g1 26- 30, g2-g2 27-30, g1-g2 31-36, ps1-ps1 13-16, ps2-ps2 15- 19, h2-h2 26-29, h3-h3 93-101.

Gnathosoma ( Figures 42, 43 View Figures , 63 View Figures ): Stylophore rounded, with only longitudinal striation. Peritreme distally hooked, hook length 14-16; palpfemur, palpgenu with 1 seta only, palpfemur d PFe 33-39, palpgenu l’’ PGe 27-32, palptibia with 3 setae and d PTi 21-25, l’ PTi 10-12, l” PTi 11-14 and a claw; palptarsus (length 14-16, wide 11-13) with 3 setae a 5-6, b 7-8, c 6-7; 1 spinneret suζ length 7-8 width 6-7; 1 solenidion ω 7-8; 2 eupathidia ul’ζ 9-10, ul”ζ 8-9. Spinneret length is slightly shorter than 2 eupathidia. The ratio of length and width of the palptarsus is equal.

Leg ( Figures 44-48 View Figures ): Leg I length 315-344, leg II length 235- 260, leg III length 206-226, leg IV length 276 (262-290), (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). Tarsus I with 10 tactile setae, 3 eupathidia, 1 solenidion and 2 sets of proximal duplex setae, 4 tactile setae proximal to the 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; tarsus III and IV each having 9 tactile setae and 1 solenidion. Empodia of leg I–IV each without a spur and split into 3 pairs of proximoventral hair.

Male: ( Figures 49-52 View Figures , 65, 66 View Figures ). Aedeagus ( Figures 52 View Figures , 65, 66 View Figures ): In the aedeagal knob having both anterior and posterior projection, the dorsal margin of knob is convex, the shaft is wider, main shaft maximum length is 8-9, the maximum width is 4-5, maximum neck length 1-2, neck width 1-2, head length 2-3, the axis of the head forming angle with the shaft 50 o.

Leg ( Figures 49, 50 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. 4 tactile setae 2 solenidia proximal to the proximal duplex setae. Tarsus II with 10 tactile setae, 1 solenidion, 3 eupathidia, and 1 set of duplex setae. Tibiae II with 7 tactile setae. Empodia of legs I and II split with a prominent spur.

Gnathosoma ( Figure 51 View Figures ): Palpal setation from femur to tibiae d PFe 8-9, l’’ PGe 22-28, d PTi 20-24, l’ PTi 12- 14, l” PTi 13-17. Palpfemur setae d PFe modified into a clawlike structure. palptarsus length 11-13, wide 9-11; palptarsus with 3 three setae a 8-9, b 9-10, c 10-11, 1 spinneret suζ length 5-6, wide 2-3, one solenidion ω 6-7 and 2 eupathidia ul’ζ 6-7, ul”ζ 7-8. Spinneret length and width ratio 2:1.