Euseius tripurii, Kar & Karmakar, 2022

Kar, Anamika & Karmakar, Krishna, 2022, Seven new species of phytoseiid mites (Acari: Mesostigmata) from Tripura, northeastern India, Zootaxa 5120 (2), pp. 213-241 : 220-222

Euseius tripurii sp. nov.

( Figs 11–15 , 45–50 )

Diagnosis. The dorsum of the new species is heavily reticulated with five pairs of solenostomes; peritreme extends until base of j3; sternal shield reticulated; other ventral plates smooth; fixed digit of chelicerae with five teeth and a pilus dentilis; spermatheca unique, tubular, half of calyx towards atrium is darkened, atrium broad and covers almost the total width of calyx, leg IV with three blunt macrosetae of hyaline tip.

Description

Female (n=13). Dorsum ( Fig. 11 ). Dorsal shield 325 (322–300) long and 208 (205–210) wide, strongly reticulated, with sigilla mostly on prodorsal area, prodorsum wide with five pairs of solenostomes (gd2, gd4, gd5, gd8 and gd9); 17 pairs of setae on dorsal shield and two pairs of setae on unsclerotised cuticle: j1 28 (28–30), j3 24 (22–25), j4 11 (9–12), j5 11 (9–12), j6 12 (10–13), J2 12 (10–13), J5 5 (4–6), z2 15 (13–16), z4 20 (18–21), z5 10 (9–11), Z1 12 (11–14), Z4 15 (14–17), Z5 46 (43–46), s4 26 (24–27), S2 16 (15–18), S4 20 (19–21), S5 23 (22–25), r3 10 (9–12), R1 15 (13–16). All setae smooth, setae j1, j3, z4, Z4, Z5, s4, S2, S4 and S5 long, seta Z5 longest, all other setae medium to small.

Peritreme ( Fig. 11 ). Extending until base of j3.

Venter ( Fig. 12 ). Sternal shield square shaped, posterior margin of sternal shield indistinct and forms a groove at the lateral part of the posterior margin of sternal shield. Sternal shield 56 (55–58) long and 68 (66–69) wide at level of setae st1–st3 and st3–st3 respectively, with three pairs of setae and two pairs of poroids; one pair of setae (st4) 20 (19–22) long and conspicuous poroids on distinct metasternal plate. Distances between st2–st2 58 (56–59), st5–st5 72 (70–73). Two pairs of metapodal platelets present. Primary metapodal platelet 17 (15–18) long and 4 (3–5) wide, secondary metapodal platelet 8 (8–10). Genital shield smooth, broad at base and narrow at genital opening with irregular circular flap touching sternal loop anteriorly. Ventrianal shield smooth, slightly sclerotised at anterior part 91 (90–93) long, 45 (44–48) wide at level of ZV2 and 60 (58–62) wide at anus level with three pairs of pre-anal setae, JV1 24 (22–25), JV2 27 (26–28), ZV2 27 (26–28) and one pair of large elliptical pre-anal pores gv3 27 (26–28) apart below JV2. Membrane surrounding ventrianal shield with four pairs of setae ZV1 23 (22–24), ZV3 7 (6–9), JV4 9 (8–10) and JV5 33 (32–35); seta JV5 long and smooth.

Chelicera ( Fig. 13 ) Fixed digit 25 (23–26) long with five teeth clubbed anteriorly and distinct pilus dentilis, movable digit 22 (22–25) long with one tooth.

Spermatheca ( Fig. 14 ) Calyx, tubular, elongated 14 (12–15) long, proximal half portion of calyx towards atrium darkened, atrium broad, almost covers the total width of calyx, minor duct and major duct visible.

Legs ( Fig. 15 ) The genu, tibia and tarsus of leg IV with blunt with macrosetae of hyaline tip and following lengths: genu 33 (31–35), tibia 30 (30–33) and tarsus 60 (59–63). Chaetotactic formula of genu II 1 2/1 1/1 1 and genu III 1 1/1 2/1 1. Length of leg I 412 (410–418), leg II 270 (265–275), leg III 275 (272–280) and leg IV 385 (382–390). Leg II and III with macrosetae. Genu II 20 (19–22), tibia II 20 (19–22), tarsus II 25 (23–26); genu III 27 (25–28), tibia III 22 (20–24), tarsus III 22 (20–24).

Type specimens. Holotype: female (Acarol.lab/ BCKV/8593 /2021) deposited in the NZC, Zoological Survey of India, Kolkata), collected from star fruit tree, ( Averrhoa carambola ) at Khowai : 24°2'24"N, 91°35'56"E, 34m AMSL, Khowai , Tripura on 6 th February , 2021; 2 paratype females (Acarol.lab/ BCKV/8594 /2021) with same collection data as holotype; 10 paratype females (Acarol.lab/ BCKV/8676–82 /2021) collected from tamarind ( Tamarindus indica ) from East Sikkim: 27°17'25"N, 88°35'36"E, 820m AMSL, East Skkim , Sikkim on 30 th March , 2021 and deposited in the Acarology laboratory of BCKV, Mohanpur.

Etymology. The specific name tripurii refers to the name of the major tribal community of Tripura, called Tripuri.

Remarks. The new species is different from all the species of Euseius by its unique spermatheca and reticulated sternal shield and also differs from all the Euseius species described and recorded from India (Kar & Karmakar, 2021). However, the new species is close to Euseius victoriensis ( Womersley, 1954) ; E. magucii ( Meyer &Rodrigues, 1966) ; E. noumeae ( Schicha, 1979) ; and E. neomagucii Ueckermann, Moraes & Oliveira, 2001 in Moraes et al. (2001) by having almost similar type of spermatheca; but differs from these close species by the dorsal shield reticulated versus smooth; sternal shield reticulated versus smooth; length of dorsal setae; number of teeth in fixed and movable digit of chelicera; leg macrosetae and the shape of spermatheca. All the differences between the new species and its close species are given in Table 3 .

Sources of measurement: Original paper; Womersley, 1954; Meyer and Rodrigues, 1966; Schicha, 1979; Moraes et al., 2001 ‘–’: not available.

Figures

FIGURES 11–15. Euseius tripurii (female). 11. Dorsal view of idiosoma; 12. Ventral view of idiosoma; 13. Chelicera; 14. Spermatheca; 15. Genu, tibia and basitarsus of leg IV.

FIGURES 45–55. 45–50. Euseius tripurii (female). 45. Dorsal view of idiosoma; 46. Ventral view of idiosoma; 47. Part of dorsal opisthosoma; 48. Chelicera; 49. Genu, tibia and basitarsus of leg IV; 50. Spermatheca; 51–55. Phytoseius birbikrami (female). 51. Anterior dorsal view of idiosoma; 52. Dorsal opisthosomal view; 53. Genu, tibia and basitarsus of leg IV; 54. Chelicera; 55. Spermatheca.