Tetranychus hypogaeae Gupta, 1976

Tetranychus hypogaeae Gupta, 1976 View in CoL

24. leg II, 25. pedipalp, 26. aedeagus.

Tetranychus hypogaeae Gupta, 1976: 347 - 348 View in CoL ; Gupta, 1985: 112 - 113.

Tetranychus hypogaeae Gupta, 1976 View in CoL : Gupta & Gupta, 1994: 1 - 196.

( Figures 14-22 View Figures , 23-26 View Figures , 56-59 View Figures )

Diagnosis: Male: Empodia of leg I–IV each with free long, proximoventral hair, appearing tridigitate with prominent mediodorsal spur. Tarsus I bears 2 tactile setae and 3 solenidia proximal to the proximal duplex setae. Palpfemur seta d PFe modified into a clavate structure. Aedeagal knob with minute posterior projection, anterior projection with a pointed tip which forms an angle of 60 o with the shaft, the dorsal margin of knob convex.

Female: Striation pattern between dorsocentral setae e1– f1 forming a diamond-shaped pattern. Striation in the pregenital region is longitudinal, oblique and continuous. Peritreme hook length 22–25. Tarsus I with 4 setae positioned behind proximal duplex setae. Empodia of each leg split into 6 proximoventral hairs with prominent dorsomedian spurs. Spinneret length and width 5–6 x 4–5.

Material examined: 16 females (Acarol. lab/BCKV/4455- 70/55) and 13 males (Acarol. lab/BCKV/4471- 83/71) collected from Arachis hypogaea L. ( Fabaceae ) Berhampore, Murshidabad (24° 5’ 56’’ N, 88° 16’ 4’’ E) Nadia, West Bengal, 18 th April, coll. Subhra Samanta.

Female: ( Figures 14-22 View Figures , 56, 57 View Figures ). Dorsum ( Figure 14 View Figures ): Length of the idiosoma 408-445, width at the level of c setae 324-353, propodosoma having longitudinal striation forming a semicircular lobe. Histerosomal striation transverse and longitudinal, between setae e1- e1 and f1-f1 striation pattern longitudinal or oblique, striation between setae e1-f1 forming a diamond-shaped pattern. Length of dorsal setae: v2 71-80, sc1 128-147, sc2 93-107, c1 126-140, c2 130-136, c3 104-114, d1 131-141, d2 116-126, e1 123-131, e2 128-139, f1 107-118, f2 101-

111. Distance between dorsal setae: v2-v2 63-71, v2-sc1 21-27, sc1–sc2 81-89, sc1-sc1 84-92, sc2-sc2 239-257, c1-c1 80-90, c1-c2 38-46, c2-c3 75-83, c2-c2 178-186, c3-c3 312- 325, d1-d1 92-102, d1-d2 72-80, d2-d2 237-248, c1-d1 23-31, c3-d2 60-68, e1- e1 59-69, e1-e2 75-83, e2-d2 75-83, e2-e2 186-197, f1-f1 49-55, f2-f2 98-108, f1-f2 67-73, f1-d1 130-140.

Venter ( Figures 15 View Figures , 57 View Figures ): Ventral setae slender, smooth. Lengths: 1a 51-60, 1b 62-75, 1c 76-87, 2b 70-80, 2c 72- 85, 3a 46-54, 3b 67-77, 4a 62-70, 4b 63-69, ag 65-73, g1 31-37, g2 28-34, ps1 17-21, ps2 15-17, h2 41-48, h3 38-44. Striation pattern between intercoxal region transverse; striation in the pregenital region longitudinal, oblique and continuous. Distance between intercoxal setae: 1a -1a 39-43, 3a-3a 72-84, 4a-4a 71-79, ag-ag 86-96, g1-g1 26- 30, g2-g2 84-92, g1-g2 31-37, ps1-ps1 24-26, ps2-ps2 21- 23, h2-h2 28-35, h3-h3 87-95.

Gnathosoma ( Figures 16, 17 View Figures , 56 View Figures ): Stylophore rounded, with only longitudinal striation. Peritreme distally hooked, hook length 22-25; palpfemur, palpgenu with 1 seta only, palpfemur d PFe 31-37, palpgenu l’’ PGe 29-37, palptibia with three setae and d PTi 18-24, l’ PTi 8-10, l” PTi 9-11 and a claw; palptarsus (length 11-14, wide 12-14) with 3 setae a 7-9, b 6-8, c 7-9; one spinneret suζ length 5-6, width 4-5; one solenidion ω 6-7; two eupathidia ul’ζ 3-4, ul”ζ 4-5. Spinneret length is slightly longer than two eupathidia. The ratio of length and width of the palptarsus is equal.

Leg ( Figures 18-22 View Figures ): Leg I length 330-355, leg II length 226-245, leg III length 252-270, leg IV length 303-334, (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, 2 proximal tactile setae aligned in line with proximal duplex setae, 1 solenidion and 1 tactile seta 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; tarsus 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 hair-like structures known as proximoventral hair.

Male: ( Figures 23-26 View Figures , 58, 59 View Figures ). Aedeagus (( Figures 26 View Figures , 58-59 View Figures ): In the aedeagal knob having a minute posterior projection, anterior projection with a pointed tip, dorsal margin of knob convex, main shaft maximum length 9-10, maximum width 5-6, maximum neck length 1-2, neck width 1-2, head length 1-2, the axis of the head forming angle with the shaft 60 o.

Leg ( Figures 23, 24 View Figures ): Tarsus I with 10 tactile setae, 3 solenidia, 3 eupathidia, and 2 sets of duplex setae. Tarsus I bears 2 tactile setae and 3 solenidia proximal to the proximal duplex setae. Tibia I with 4 solenidia, and 9 tactile setae. Tarsus II with 10 tactile setae, 1 solenidion, 3 eupathidia, and 1 set of duplex setae. Tibia II with 7 tactile setae. Empodia split with a prominent spur.

Gnathosoma ( Figures 25 View Figures ): Palpal setation from femur to tibia d PFe 8-10, l’’ PGe 20-24, d PTi 10-12, l’ PTi 6-8, l” PTi 7-8. Palpfemur seta d PFe modified into a clavate-shaped structure. palptarsus length 10-12, wide 13-15; palptarsus with 3 setae a 5-7, b 6-8, c 6-7, 1 spinneret suζ (length 3-5, wide 1-2), 1 solenidion ω 3-4 and two eupathidia ul’ζ 8-9, ul”ζ 7-8. Spinneret length and width ratio 3:1.

Remarks: This species was described by Gupta,in1976 after specimens collected from Pulses and Oilseeds Research Station, Berhampore, Murshidabad, West Bengal, India, on Arachis hypogaea . Due to the non-availability of the holotype, the specimens were recollected from the same locality and host plant that has been identified as Tetranychus hypogaeae Gupta, 1976 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 setae of male. A clear variation of the shape of the aedeagus was observed in the present neotype of T. hypogaeae with the original illustration which is suspected due to poor visibility and illustration in the original description. Hence, a complimentary description of the species has been provided in addition to earlier descriptions and illustrations.