Phytoseius namkhanaensis

Karmakar, Krishna & Bhowmik, Sagarika, 2018, Description of eight new species and re-description of four species belonging to the family Phytoseidae (Acari: Mesostigmata) from West Bengal, India, Zootaxa 4422 (1), pp. 41-77: 69-73

publication ID

https://doi.org/10.11646/zootaxa.4422.1.3

publication LSID

lsid:zoobank.org:pub:68D70470-6E6C-498D-AAF6-DA3CA8F93D2E

persistent identifier

http://treatment.plazi.org/id/93548244-FF8E-FFBF-588E-FC7188962560

treatment provided by

Plazi

scientific name

Phytoseius namkhanaensis
status

sp. nov.

Phytoseius namkhanaensis  sp. nov.

( Figs 72–78 View Figure , 106–111 View Figure )

Female (n = 10). Dorsum ( Figs 72 View Figure , 106 View Figure ). Dorsal shield 295, 289 (280–297), long and 157, 149 (138–160), wide strongly sclerotised with irregular to roundish patches over the entire dorsum with four pairs of solenostomes (gd4, gd5, gd8 and gd9); 15 pairs of dorsal setae: j 1 26, 25 (25–26), j 3 25, 25 (24–26), j4 8, 8 (8–9), j5 8, 8 (8–9), j 6 10, 11 (9–12), J 5 10, 9 (9–10), z 2 11, 11 (10–12), z3 33, 32 (30–33), z 4 14, 14 (14–15), z5 8, 7 (7–8), Z4 53, 54 (52–55), Z5 69, 67 (63–70), s4 79, 78 (78–79), s6 81, 82 (80–83), r3 36, 37 (35–38). All setae are serrated except j4, j5, z2, z4, z5, j6 and J5, which are short and smooth while setae s4, s6, Z4 and Z5 are long.

Peritreme ( Fig. 72 View Figure ). Extending forward beyond the bases of j1.

Venter ( Fig. 73 View Figure ). All shields smooth, sternal shield 59, 58 (55–60) long and 77, 79 (75–83) 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) on the metasternal plates; posterior margin of sternal shield slightly convex and clearly visible. Distances between ST2–ST2 60, 61 (60–62), ST5–ST5 67, 66 (63–68). One pair of metapodal shields 30, 30 (29–31) long. Ventrianal shield sole-shaped ( Fig. 107 View Figure ), 103, 100 (95–105) long, 39, 38 (36–40) wide at level of ZV2 setae and 49, 49 (47–50) wide at level of anus; with three pairs of pre-anal setae, JV1, JV2 and ZV2, one pair of pre-anal pores near lateral margin of ventrianal shield above the line of anal opening. Membrane surrounding ventrianal shield with three pairs of setae: ZVl, ZV3 and JV5; the latter 44, 43 (42–44) long, serrated.

Chelicera ( Figs 74 View Figure , 111 View Figure ). Fixed digit 25, 25 (23–26) long, with three teeth, movable digit 25, 25 (23–26) long, with one tooth.

Spermatheca ( Figs 75 View Figure , 108 View Figure ). Calyx funnel-shaped, flared at the base of vesicle and narrow at the base of atrium 6 5 (5–6) long, atrium and major duct distinct minor duct not visible.

Legs ( Fig. 76 View Figure ). Legs IV with three smooth macrosetae with rounded and hyaline tips ( Fig. 11 View Figure ) and of the following lengths: genu 17, 16 (15–17), tibia 32, 32 (32–33), basitarsus 23, 23 (21–24). Chaetotactic formula of genu II: 1–2/1, 2/0–1; genu III: 1–2/0, 2/0–1. Length of leg I: 269, 267 (263–270), leg II: 235, 231 (223–238), leg III: 225, 224 (223–225), leg IV: 390, 384 (375–393).

Male (n = 3). A lightly sclerotised mite with 15 pairs of dorsal setae. Idiosomal setal pattern: 12A: 3A/ JV –3,4: ZV –1,3.

Dorsum. Dorsal shield 198, 195 (190–200), long and 147, 148 (145–150), wide with four pairs of solenostomes (gd4, gd5, gd8 and gd9); 15 pairs of dorsal setae: j 1 17, 17 (17–18), j 3 20, 20 (19–21), j4 7, 6 (5–7), j5 8, 7 (7–8), j6 8, 8 (6–9), J5 7, 6 (5–7), z2 8, 8 (8–9), z 3 17, 18 (16–19), z4 9, 8 (7–9), z5 7, 7 (7–8), Z 4 29, 30 (29–31), Z 5 30, 31 (29–32), s4 42, 41 (39–43), s6 41, 42 (41–43), r 3 28, 27 (27–28). All setae except j4, j5, j6, J5, z2, z4 and z5 are smooth and short while j1, j3, z3, s4, s6, r3, Z4 and Z5 are long and serrated. Setae s4, s6, Z4, and Z5 are very long.

Peritreme. Extending beyond level of j1.

Venter ( Fig. 77 View Figure ). The sternogenital shield smooth with five pairs of setae and two pair of distinguishable lyrifissures. Ventrianal shield 66, 65 (63–67) long, 90, 90 (88–91) wide at the level of ZV2 setae, 65, 64 (63–65) wide at the level of anus, with three pairs of pre-anal setae, JV1, JV2, and ZV2, one pair of pores and a pair of distinguishable lyrifissures. Unsclerotised membrane surrounding ventrianal shield with one pair of setae, JV5, at level below anal opening.

Legs. Leg IV with three smooth macrosetae of following lengths; genu 6, 5 (5–6), tibia 7, 7 (6–8), basitarsus 17, 18 (16–19). Chaetotactic formula of genu II: 1 2/1, 2/0 1; genu III: 1 2/0, 2/0 1. Length of leg I: 228, 225 (220–230), leg II: 180, 175 (163–186), leg III: 180, 175 (163–186), leg IV: 275, 275 (272–277).

Chelicera ( Figs 78 View Figure , 109 View Figure ). Spermatodactyl with an elongated shaft 12, 12 (12–13) long, terminating with a wide toe, 7 long.

Type Specimens. Holotype: female (Acar.lab/ BCKV /8273/2017) (Registration number 4417/17 deposited in the NZC, Zoological Survey of India, Kolkata) collected from Guava, Psidium guajava ( Myrtaceae  ) at Kakdwip: 21° 87' 60" N, 88° 18' 53" E, 3m above mean sea level, South 24 Parganas, West Bengal on 8 April 2017; 2 paratype females (Acar.lab/ BCKV /8274-8275/2017) with same collection data as holotype; 1 paratype female (Acar.lab/ BCKV /8278/2017) (Registration number 4418/17 deposited in the NZC, Zoological Survey of India, Kolkata) collected from Kamini, Murraya paniculata  , ( Rutaceae  ) at same locality and collection date as holotype; 1 paratype male (Acarol.lab/ BCKV /8276/2017) (Registration number 4419/17 deposited in the NZC, Zoological Survey of India, Kolkata), collected from Guava, Psidium guajava ( Myrtaceae  ) and 2 paratype males (Acarol.lab/ BCKV /8277/2017), collected from Tephari at same locality and collection date as holotype female.

Etymology. The specific name namkhanaensis  refers to the locality where the types of this species were collected.

Remarks. Phytoseius namkhanaensis  is close to P. chinensis (Wu & Li, 1982)  , P. corniger ( Wainstein, 1959)  and P. roseus ( Gupta, 1969)  but the former species differs from P. chinensis  by its shorter j3 25, Z4 54 and Z5 67 than the latter species j3 45, Z4 75 and Z5 85. The former species differs from the latter species by the shape and size of ventrianal shield, macrosetae of leg IV, spermatheca and number of teeth on the fixed digit of chelicerae. The dorsal setae j3 25, s4 78 and Z4 54 of Phytoseius namkhanaensis  are much shorter than the setae j3 48, s4 128 and Z4 84 of P. corniger  . The former species differs from P. corniger  by the shape of ventrianal shield, which is sole-shaped in the former species and vase-shaped in the latter species. The macrosetae on leg IV of the former species are club-shaped in contrast with the rod-shaped macrosetae on leg IV in the latter species. The dorsal shield setae j3 25, s4 78 and Z4 54 of P. namkhanaensis  are much shorter than j3 (31–40), s4 (99–100) and Z4 (72–78) of P. roseus  . The posterior margin of the sternal shield is convex in the former species while it is concave in the latter species. The genu, tibia and tarsus of leg IV of the former species having club-shaped macrosetae while in the latter species the genu is without any macrosetae.