Typhlodromips neosyzygii, Bhowmik & Karmakar, 2021

Bhowmik, Sagarika & Karmakar, Krishna, 2021, Five new species and re-description of eight species belonging to the family Phytoseiidae (Acari: Mesostigmata) from West Bengal, India, Zootaxa 4975 (3), pp. 401-450 : 429-431

Typhlodromips neosyzygii sp. nov.

( Figs 53–57 , 108–110 )

Female (n =3)

Diagnosis. Dorsal shield strongly reticulated with lateral striations and light marks of sigilla. Idiosomal setal pattern 10A: 9B/ JV –3: ZV. Setae j4, j5, j6, J2, J5, z2, z4, z5, Z1, S2, S4, S5, r3 and R1 are short and smooth while j1, j3, s4, Z4 and Z5 are relatively long and smooth except Z4 and Z5 lightly serrated; spermatheca disc-shaped and atrium kidney-shaped with distinct major and minor ducts. Posterior margin of sternal shield concave. Ventrianal shield pentagonal with two pairs of contiguous protruberances at inner lateral margins at the level of anus.

Dorsum ( Fig. 53 ). Dorsal shield 325 (313–325) long and 213 (208–213) wide, striated laterally and strongly reticulated in dorsal opisthosomal area, with marks of sigilla and seven pairs of solenostomes (gd1, gd2, gd4, gd5, gd6, gd8 and gd9); 17 pairs of dorsal setae and two pairs of sublateral setae: j1 15 (15–16), j3 21 (19–21), j4 10 (8–10), j5 9 (8–9), j6 11 (10–11), J2 15 (12–15), J5 8 (8–9), z2 12 (10–12), z4 12 (10–12), z5 10 (9–10), Z1 14 (13–14), Z4 33 (32–33), Z5 70 (65–70), s4 22 (20–22), S2 12 (10–12), S4 9 (9–10), S5 8 (7–8), r3 16 (13–16), R1 12 (11–12). All setae smooth except Z4 and Z5 lightly serrated.

Peritreme ( Fig. 53 ). Extending forward up to level of j1.

Venter ( Fig. 54 ). All shields smooth. Sternal shield with 55 (55–56) long and 72 (68–72) wide at level setae ST1–ST3 and ST3–ST3 respectively, with three pairs of setae and two pairs of lyrifissures; one pair of setae (ST4) on the membrane; posterior margin concave. Distances between ST2–ST2 65 (61–65), ST5–ST5 68 (64–68). Two pairs of metapodal shields, primary shield 20 (16–20) long, secondary shield small 13 (9–13) long. Ventrianal shield pentagonal 102 (102–105) long, 75 wide at level of JV2 setae and 81 (80–81) wide at level of anus; with three pairs of pre-anal setae, JV1, JV2 and ZV2, two pairs of contiguous protruberances at inner lateral margins at the level of anus and one pair of large elliptical pre-anal pores. Membrane surrounding ventrianal shield with four pairs of setae ZVl, ZV3, JV4 and JV5, the latter 32 (31–32) long smooth.

Chelicera ( Fig. 55 ). Fixed digit 26 (26–27) long, with nine teeth, pilus dentilis inconspicuous; movable digit 25 (25–26) long, with two teeth.

Spermatheca ( Fig. 56 ). Calyx disc-shaped, 6 (6–7) long. Atrium distinctly kidney-shaped with major and minor duct.

Legs ( Fig. 57 ). Legs IV with three smooth macrosetae with pointed tips of the following lengths: SgeIV 45 (40–45), StiIV 28 (28–31), StIV 52 (49–52). Chaetotactic formula of genu II: 2 2/0, 2/0 1; genu III: 1 2/1, 2/0 1. Length of leg I: 293 (293–300), leg II: 263 (263–265), leg III: 263 (263–265), leg IV: 325 (325–340).

Type specimen. Holotype: Female (Acar.lab/ BCKV /8296/2018) collected from Maize, Zea mays (Poaceae) at Patiram: 25°20’5.56” N, 88°45’41.11” E, 31 m above mean sea level, Dakshin Dinajpur, West Bengal on 11 April 2018. One paratype female (Acar.lab/ BCKV /8295/2018), same data as holotype. Holotype and paratype female have been deposited in the National Zoological Collection (NZC), Zoological Survey of India, Kolkata.

Distribution. Asia: India, West Bengal.

Etymology. The specific name is neosyzygii is given because the present species is very close to T. syzygii .

Remarks. Typhlodromips neosyzygii sp. nov. is close to Typhlodromips syzygii ( Gupta, 1975) and T. potentilae ( Garman, 1958) but differs from them by the length of dorsal shield setae, length of peritreme, shape of ventrianal shield, posterior margin of sternal shield and shape and dentition of cheliceral fixed and movable digit. The dorsal shield setae Z4 of the former species extend near the base of S5 while Z4 reaches half the distance of S 5 in latter species. The peritreme extends up to the base of j 1 in the former species while it extends beyond j 1 in the latter species. The posterior margin of the sternal shield of the former species is concave and slightly wavy while it is smoothly concave in case of the latter species. Also the anterior lateral margins of ventrianal shield are almost parallel with widened lateral margin at anal opening which differs from the latter species. The cheliceral fixed digit of the former species has nine teeth and the moveable digit has two small teeth which do not agree with the latter species, which has more than ten teeth on the fixed digit and three teeth on the movable digit. The shape of the genital shield of former species also differs from the latter species.

Figures

FIGURES 53–57. Typhlodromips neosyzygii sp. nov. (female). 53. Dorsal idiosoma; 54. Ventral idiosoma; 55. Chelicera; 56. Spermatheca; 57. Genu, tibia and basitarsus IV.

FIGURES 106–113. 106. Typhlodromips jhilimiliensis, female, sternal shield; 107. Typhlodromips jhilimiliensis, female, ventrianal shield. 108; Typhlodromips neosyzygii, female, sternal shield; 109. Typhlodromips neosyzygii, female, genital shield; 110. Typhlodromips neosyzygii, female, ventrianal shield; 111. Proprioseiopsis amari, female, chelicera; 112. Proprioseiopsis amari, female, spermatheca; 113. Proprioseiopsis amari, female, genital and ventrianal shields.