Typhlodromus (Anthoseius) bengalensis Karmakar et al., 2021

Molla, Md. Iftiar Hossain, Kar, Anamika, Bala, Suvash Chandra & Kar, Krishna Karma-, 2021, Description of four new species of phytoseiid mites belonging to the genus Typhlodromus (Anthoseius) De Leon from West Bengal, Zootaxa 4949 (3), pp. 541-556 : 545-547

Typhlodromus (Anthoseius) bengalensis Karmakar et al. sp. nov.

( Figs 6–10 ; 26–28 )

Description

Female (n = 7). Dorsal shield strongly reticulated, elliptical, idiosomal setal pattern 12A:8A/JV:ZV, all setae serrated, tip of setae Z4, Z5 and S5 knobbed, spermatheca tubular with a distinct septum near about the base of vesicle, leg IV with three short, smooth and knobbed macrosetae.

Dorsum ( Fig. 6 ). Dorsal shield 280 (278–284) long and 151 (142–153) wide, strongly reticulated, prodorsum with six pairs of solenostomes (gd2, gd4, gd5, gd6, gd8 and gd9); 18 pairs of setae on dorsal shield and two pairs of setae on unsclerotised cuticle: j1 15 (12–15), j3 26 (26–28), j4 23 (22–23), j5 25 (22–25), j6 28 (25–28), J2 33 (32–33), J5 8 (8–10), z2 28 (26–28), z3 30 (30–31), z4 30 (30–32), z5 25 (22–25), Z4 40 (38–40), Z5 40 (40–42), s4 38 (36–38), s6 38 (35–38), S2 38 (38–40), S4 38 (38–40), S5 33 (30–33), r3 36 (36–38), R1 31 (31–32). All setae are long and serrated with pointed tip except setae Z4, Z5 and S5 with bulbous tip.

Peritreme ( Fig. 6 ). Extending up to the bases of j1.

Venter ( Fig. 7 ). All shields are smooth. Sternal shield rectangular, indented laterally, 60 (58–61) long and 56 (55–59) wide at level of setae ST1–ST3 and ST3–ST3 respectively, with three pairs of setae and two pairs of lyrifissures; one pair of setae ST4 22 (20–23) on distinct metasternal plate; posterior margin of sternal shield concave. Distances between ST2–ST2 50 (48–54), ST5–ST5 37 (35–38). Two pairs of metapodal shields present, primary shield tubular 24 (23–25) long and secondary shield small 13 (12–15) long. Ventrianal shield pentagonal and smooth 80 (78–82) long, 48 (46–50) wide at level of ZV2 setae and 51 (50–55) at anus level with four pairs of pre-anal setae JV1 10 (9–11), JV2 12 (11–13), JV3 12 (10–13), ZV2 12 (11–14) and one pair of pre-anal pores. Membrane surrounding ventrianal shield with four pairs of setae ZV1 13 (11–14), ZV3 10 (9–12), JV4 15 (14–16) and JV5 35 (34–38); seta JV5 long and serrated with bulbous tip.

Chelicera ( Fig. 8 ). Fixed digit 22 (22–25) long, sections anterior and posterior to pilus dentilis each with two teeth, movable digit 20 (19–22) long with two teeth.

Spermatheca ( Fig. 9 ). Calyx elongated tubular 15 (13–16) long, little wider and with a distinct septum near about at the base of vesicle and tapering towards atrium, minor duct and major duct clearly visible.

Leg ( Fig. 10 ). Leg IV with three macrosetae on genu, tibia and tarsus. All leg setae are smooth, tips of macrosetae bulbous, of following lengths: genu 13 (12–16), tibia 13 (12–15) and basitarsus 15 (13–17). Chaetotactic formula of genu II: 1–2/0. 2/1–1 and genu III: 1–2/1. 2/0–1. Length of leg I: 245 (235–248), leg II 203 (195–210), leg III 180 (178–185) and leg IV 233 (228–235).

Type specimens. Holotype: female (Acarol.lab/BCKV/8352/2019) deposited in the NZC, Zoological Survey of India, Kolkata, collected from Banyan tree, ( Ficus bengalensis L.: Moraceae ), at Akna: 22°58’48”N 88°20’46”E, 11m above mean sea level, Hooghly, West Bengal on 15 th June, 2019 ; six paratype females (Acarol.lab/ BCKV /8353–58/2019) with same collection data as holotype.

Etymology. The specific name bengalensis refers to the host plant species Ficus bengalensis from where this new species were collected.

Remarks. The new species Typhlodromus (Anthoseius) bengalensis is close to T. (A.) divergentis (Choudhury, Akbar & Rasool 1974) and T. (A.) gopali ( Gupta, 1969) but they differ from the new species by pattern of dorsal shield setae, shape of ventrianal shield, spermatheca and tip of macrosetae of leg IV. All the dorsal setae are characteristically serrated in the new species while none of the other species having all setae serrated. The new species differs from T. (A.) divergentis by dorsal shield setae (serrated versus smooth); macrosetae of leg IV (bulbous versus pointed), number of macrosetae of leg IV (three versus single). The new species differs from the T. (A.) gopali by dorsal shield setae (serrated versus smooth); number of macrosetae of leg IV (three versus single). All the differences between Typhlodromus (Anthoseius) bengalensis and the close species are given in Table 2 .

Figures

FIGURES 6–10. Typhlodromus (Anthoseius) bengalensis (female). 6. Dorsal view of idiosoma; 7. Ventral view of idiosoma; 8. Chelicera; 9. Spermatheca; 10. Genu, tibia and basitarsus of leg IV.

FIGURES 26–34. 26–28, Typhlodromus (Anthoseius) bengalensis sp. nov.; part of dorsal opisthosoma, macrosetae on leg IV, spermatheca; 29–31. Typhlodromus (Anthoseius) adhatoda sp. nov. part of dorsal opisthosoma, macrosetae on leg IV, spermatheca; 32–34. Typhlodromus (Anthoseius) sagaricus sp. nov. part of dorsal opisthosoma, macrosetae on leg IV, spermatheca.