Typhlodromus (Anthoseius) bulbosis 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 : 543-545

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

( Figs 1–5 ; 21–25)

Description

Female (n = 6). Dorsal shield smooth with light marks of sigilla; prodorsum wider than opisthosoma, idiosomal setal pattern 12A:8A/JV:ZV; tips of all dorsal and leg macrosetae characteristically bulbous apically except J5; spermatheca tubular, wider at the base of the vesicle, bent like a hook near base of distinct atrium.

Dorsum ( Fig. 1 ). dorsal shield 408 (405–412) long and 188 (188–194) wide, smooth, prodorsum wider than opisthosoma, with five pairs of solenostomes (gd1, gd4, gd6, gd8 and gd9); 18 pairs of setae on dorsal shield and two pairs of setae on unsclerotised cuticle: j1 28 (25–28), j3 37 (33–37), j4 23 (23–24), j5 25 (25–26), j6 30 (30–33), J2 28 (28–29), J5 10 (10–11), z2 28 (28–30), z3 28 (25–28), z4 35 (35–36), z5 25 (24–25), Z4 40 (38–40), Z5 53 (52–53), s4 38 (36–38), s6 35 (33–35), S2 33 (33–34), S4 28 (28–29), S5 25 (25–26), r3 45 (45–47), R1 38 (35–38). All setae long with bulbous tip except seta J5 which is short and with pointed tip.

Peritreme ( Fig. 1 ). Extending beyond the bases of j3 but not reaching the base of j1.

Venter ( Fig. 2 ). All shields are smooth. Sternal shield rectangular, posterior margin of sternal shield convex 100 (98–102) long and 93 (87–95) 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 25 (23–26) on indistinct metasternal plate. Distances between ST2–ST2 95 (92–96), ST5–ST5 64 (62–66). Two pairs of metapodal shields present, primary shield 25 (23–27) long and 8 wide and secondary shield 13 (12–14) long. Genital shield smooth, sides nearly parallel laterally. Ventrianal shield long, narrower posteriorly, pentagonal, smooth 132 (130–134) long, 92 (90–94) wide at level of ZV2 setae and 69 (68–70) at anus level, with four pairs of pre-anal setae JV1 27 (26–28), JV2 24 (23–25), JV3 21 (20–22), ZV2 23 (23–24) and one pair of distinct pre-anal pores 18 (17–19) apart at the level of JV3. Membrane surrounding ventrianal shield with four pairs of setae ZV1 22 (20–23), ZV3 14 (13–15), JV4 15 (14–16) and JV5 47 (45–48); seta JV5 long and smooth with bulbous tip.

Chelicera ( Fig. 3 ). Fixed and movable digits very long. Fixed digit 64 (63–65) long, sections anterior and posterior to pilus dentilis each with two teeth, movable digit 63 (63–64) long with two teeth.

Spermatheca ( Fig. 4 ). Calyx elongated 30 (28–30) long, wider at base of vesicle and gradually tapering and bent like a hook near the distinct atrium. Minor and major duct arises from clearly visible atrium.

Leg ( Fig. 5 ). Leg IV with three macrosetae, on genu, tibia and basitarsus. Tips of all leg setae bulbous; macrosetae are of following lengths: genu 40 (38–42), tibia 27 (26–30) and tarsus 40 (38–42). Chaetotactic formula of genu II 1 2/0 2/1 1, genu III 1 2/1 2/0 1. Length of leg I 430 (426–432), leg II 395 (392–398), leg III 358 (355–362), and leg IV 438 (433–440).

Type specimens. Holotype: female (Acarol.lab/ BCKV/8346/2019) 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; five paratype females ( Acarol .lab/ BCKV /8347–51/2019) with same collection data as holotype.

Etymology. The specific name bulbosis refers to the bulbous tip of dorsal shield and leg setae of the new species.

Remarks. Typhlodromus (Anthoseius) bulbosis is unique among all the nine species groups of Typhlodromus (Anthoseius) . It is only close to T. (A.) cephalochaitosus Moraes et al., 2001 except seta z3 is present in the new species and absent in T. (A.) cephalochaitosus . The latter species was described from only single speciemen, so it could be possible that absence of seta z3 was accidental. The new species differs from T. (A.) cephalochaitosus by the shape of the dorsal shield, and the shape and length of the dorsal shield setae. It also differs in the size of the chelicera, the number of macrosetae on leg IV, the morphology of the leg setae, the length of the calyx, and the shape and length of the sternal shield and ventrianal shields. In the new species the prodorsum is wider versus narrower; opisthosomal setae Z5 smooth versus serrated; dorsal shield smooth versus reticulated; fixed and movable digit of chelicerae long 64 and 63 versus short 30 and 39; tip of all setae of leg IV bulbous versus few knobbed setae in T. (A.) cephalochaitosus . All the differences between the new species and T. (A.) cephalochaitosus are given in Table 1.

Figures

FIGURES 1–5. Typhlodromus (Anthoseius) bulbosis (female). 1. Dorsal view of idiosoma; 2. Ventral view of idiosoma; 3. Chelicera; 4. Spermatheca; 5. Genu, tibia and basitarsus of leg IV.