Tetranychus bambusae Wang and Ma

Zeity, Mahran, Srinivasa, N. & Gowda, C. Chinnamade, 2016, New species, new records and re-description of spider mites (Acari: Tetranychidae) from India, Zootaxa 4085 (3) : -

Tetranychus bambusae Wang and Ma

( Figs. 33–52 )

Tetranychus bambusae Wang and Ma, 1981:339 .

Male. Gray in color.

Gnathosoma. Terminal sensillum longer than broad (5.1–5.4 µm) and dorsal sensillum slightly longer than terminal (5.4–5.8 µm).

Dorsum. Idiosomal length 358–335 µm (including gnathosoma). Dorsal setae slightly barbed longer than distance between their bases. Measurements of dorsal setae: v2 43 –48, sc1 82–87, sc2 51–56, c1 62–66, c2 60–65, c3 62–69, d1 65–72, d2 69–77, e1 60–63, e2 58 –63, f1 33–37, f2 33–38, h 1 21–24.

Aedeagus. Bent dorsad. Knob forming an acute angle with shaft; knob’s posterior angulation acute, dorsal margin of knob slightly rounded to straight. Aedeagus measurement: a—5.33–5.90, b—8.95–9.22, c—3.10.0–3.50, d—28.1–29.2, knob width 3.20–3.50 ( Fig. 52 ).

Legs. Number of tactile setae and solenidia (in parenthesis) on legs I–IV:

I 2 – 1 – 10– 5– 9 + (4) – 13 + (3) + 2 duplexes

II 2 – 1 – 6 – 5 – 7 – 13 + (1) + 1 duplex

III 1 – 1 – 4 – 4 – 6 – 9 + (1)

IV 1 – 1 – 4 – 4 – 7 – 10 + (1)

Tarsus I with 4 tactile setae and 2 solenidia proximad to proximal duplex setae. Tarsus II with 3 tactile setae and 1 solenidion proximal to duplex setae. Empodium II with proximoventral hairs free, similar to empodia III–IV.

Female. Body length 375–408 µm including stylophore, width 225–255 µm.

Gnathosoma. Terminal sensillum slightly longer (5.1–5.8 µm) than wide and dorsal sensillum fusiform (6.9– 7.2 µm), as long as the terminal sensillum. Peritreme hooked distally.

Dorsum. Idiosoma with dorsal setae slender, pubescent and longer than distances between subsequent setae. Striae longitudinal between e1-e1 and f1-f1, forming a transverse oblong or diamond-shaped pattern between e1 and f1. Lobes on dorsal hysterosomal striae variable in shape, triangular and semicircular, slightly separated. Measurements of dorsal setae: v2 60 –67, sc1 113–118, sc2 79–88, c1 102–115, c2 101–108, c3 89–100, d1 97–107, d2 103–109, e1 91–93, e2 92–103, f1 70–81, f2 70–73, h1 35–45, distance between dorsal setae v2 -h1 288–310, v2- v2 64 –72, sc1-sc1 75–90, sc2-sc2 170–188, c1-c1 61–67, c2-c2 136–140, c3-c3 210–224, d1-d1 77–81, d2-d2 163– 182, e1- e1 36–44, e2-e2 126–136, f1-f 1 31–44, f2-f2 65–80, h1-h 1 21–26.

Ventral. Genital flap with transverse striae posteriorly and transverse striae flanked by longitudinal striae between g1. Pre-genital area with broken longitudinal striae, ventral lobes semicircular. Measurements of ventral setae, 1a 44–47, 1b 56–59, 1c 55–61, 2b 67–70, 2c 60–65, 3a 44–48, 3b 55–58, 4a 61–64, 4b 50–53, ag 54–55, g1 37–40, g2 34–38, ps 1 25–27, ps 2 23–28.

Legs. Number of tactile setae and solenidia (in parenthesis) on legs I–IV: I 2 – 1 – 10– 5– 9 + (1) – 13 + (1) + 2 duplexes

II 2 – 1 – 6 – 5 – 7 – 13 + (1) + 1 duplex

III 1 – 1 – 4 – 4 – 6 – 9 + (1)

IV 1 – 1 – 4 – 4 – 7 – 10 + (1)

Tarsus I with 4 tactile setae proximad to proximal duplex setae and 1 solenidion at level of proximal duplex setae. Tarsus II with 3 tactile setae and 1 solenidion proximad to duplex setae. Empodia I and II with an obvious mediodorsal spur; spur on empodium I stout and 2/3 length of proximoventral hairs; spurs on empodia III and IV absent.

Specimens examined. 13 females and 13 males on Bambusa bambos , GKVK, Bangalore, south India, August 2012 coll. Mahran Zeity ( AINP1002 ) ; 15 females and 17 males on Bambusa bambos, Dharwad , south India, September 2013 coll. Mahran Zeity ( AINP1341 ) ; Six females and nine males on Bambusa bambos, Mudigere , south India, November 2013, coll. Mahran Zeity ( AINP1397 ) .

Remarks. This species is similar to Tetranychus bambusicola Ehara , but females are separated by the ratio of the size and length of the tarsus I mediodorsal spur and relative to the proximoventral hairs. Both are larger in T. bambusae (15.2µm/ 22.5µm, ratio 68%), while they are smaller in T. bambusicola Ehara is (4µm/10µm, ratio 30%) (measurements are estimated from Ehara and Tho (1988)). The shape of the aedeagus differs slightly, with T. bambusicola having an angulate posterior tip. Both species, Tetranychus bambusae and T. bambusicola , were grouped by Flechtmann and Knihinicki (2002) in the 8th group of Tetranychus , being those with an obvious dorsomedian spur on at least empodium I. This species is a new record from India.

Figures

FIGURES 33 – 39. Tetranychus bambusae Wang and Ma (33) Dorsal view of female; (34) Peritreme; (35) Palp tarsus of female; (36) Palp tarsus of male; (37) Dorsal striae of female between e 1 and f 1; (38) Genital area of female; (39) dorsal lobes.

FIGURES 40 – 43. Tetranychus bambusae Wang and Ma (40) Tibia and tarsus I of female; (41) Tibia and tarsus II of female; (42) Tibia and tarsus I of male; (43) Tibia and tarsus II of male.

FIGURES 44 – 52. Tetranychus bambusae Wang and Ma (44 – 47) Empodium I – IV of female; (48 – 51) Empodium I – IV of male; (52) Male aedeagus.