Amblyseiulella gangtokiensis, Kar & Karmakar, 2022

Kar, Anamika & Karmakar, Krishna, 2022, Description of nine new species of phytoseiid mites (Acari: Mesostigmata) from Sikkim, a north eastern States of India, Zootaxa 5182 (3), pp. 201-237 : 208-211

Amblyseiulella gangtokiensis sp. nov.

( Figs. 11–15 ; 57–59 )

Diagnosis. Dorsum smooth with distinct notch at the level s4 and a small depression at level R1; dorsal setae, j4, j5, j6, J5, z2, z5 and Z1 smooth while other setae longer and serrated; ventrianal shield pentagonal, slightly indented at level JV2; posterior margin of sternal shield wavy; fixed digit of chelicera with two teeth and movable digit unidentate; leg IV with three macrosetae of bulbous tip; spermatheca cup shaped with nodular atrium.

Description. Female (n = 5). Dorsum ( Fig. 11 ). Dosal idiosomal chaetotaxy 10A:9B. Dorsal shield 331 (328–331) long and 182 (180–185) wide, well sclerotized, smooth, with marks of sigilla mostly on prodorsal area, prodorsum wide, with seven pairs of solenostomes (gd1, gd2, gd4, gd5, gd6, gd8 and gd9); poroids are shown in the illustration; 17 pairs of setae on dorsal shield and two pairs of setae on unsclerotised cuticle: j1 33 (30–34), j3 65 (64–66), j4 5 (4–6), j5 5 (4–6), j6 8 (7–10), J5 5 (4–6), z2 20 (19–21), z4 25 (24–28), z5 5 (4–6), Z1 7 (6–8), Z4 70 (68–72), Z5 80 (78–82), s4 83 (82–85), S2 45 (44–48), r3 58 (56–59), R1 28 (27–30). All the dorsal setae serrated medium to long while the setae j4, j5, j6, J5, z2, z5 and Z1 are smooth and short seta Z5 is longest.

Peritreme ( Fig. 11 ). Extending up to the base of j 1.

Venter ( Fig. 12 ). Sternal shield smooth, 73 (72–75) long, 80 (79–82) 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) 34 (33–36) on unsclerotised triangular shield; posterior margin of sternal shield wavy, lateral margin strongly indented. Distances between st2- st2 63 (62–64), st5-st5 78 (77–80). Genital shield smooth, wider at posterior part and posterior margin straight. One pair of metapodal shields present; metapodal shield 43 (42–45) long, 2 (2–3) wide. Ventrianal shield smooth 112 (110–116) long, 68 (67–70) wide at level of ZV2 setae and 64 (62–65) wide at anus level with three pairs of pre-anal setae JV1 20 (19–22), JV2 20 (20–22), ZV2 21 (20–22) and one pair of pre-anal pores (gv3) 50 (48–52) apart below JV2 and above para-anal setae. Membrane surrounding ventrianal shield with four pairs of setae ZV1 28 (28–30), ZV3 12 (11–14), JV4 17 (14–17) and JV5 53 (52–55); JV5 long and serrated.

Chelicera ( Fig. 13 ). Fixed digit 27 (25–28) long, with two teeth and distinct pilus dentilis, movable digit 28 (25–28) long unidentate.

Spermatheca ( Fig. 14 ). Calyx disc shaped, short 5 (4–6) long, atrium nodular, major duct and minor duct clearly visible.

Leg ( Fig. 15 ). Length of leg I: 320 (318–325), leg II 280 (278–285), leg III 270 (268–274) and leg IV 337 (335– 340). Chaetotactic formula of Sge II 1-2/1 2/0-1 and Sge III 2-2/1 1/1-0. Leg IV with three knobbed macrosetae of following lengths SgeIV 44 (43–46), StiIV 45 (44–46), StaIV 75 (72–75).

Type specimens. Holotype: female (Acarol.lab/ BCKV/8645/2021 ) (deposited in the NZC, Zoological Survey of India, Kolkata), collected from unidentified weed, at Bakthang Falls, East Sikkim: 27°21’28”N, 88°37’22”E, 1725 m AMSL, Sikkim on 29 th March, 2021; 4 paratype females (Acarol.lab/ BCKV/8646/2021 ) with same collection data as holotype deposited in the Acarology laboratory of BCKV, Mohanpur.

Etymology. The specific name gangtokiensis refers to the type locality from where the new species is collected.

Remarks. The new species Amblyseiulella gangtokiensis sp. nov. is different from all the 12 species described under this species sub group ( Chant and McMurtry, 2003) by having seta z2 and Z1 short, ventrianal shield long. However, the species is closed to A. heveae ( Oudemans, 1930 b) ; A. nucifera Gupta, 1979 ; A. chombongensis Ryu and Lee, 1995 ; A. odowdi Ryu and Lee, 1995 ; by having almost similar type of dorsum and spermatheca. However, this new species differs from these close species by length of dorsal setae; shape of ventrianal shield; length of metapodal shied; number of teeth in fixed and movable digit of chelicera, length and form of leg macrosetae and shape of spermatheca. All the differences are presented in Table 3 .

Figures

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

FIGURES 57–59. Amblyseiulella gangtokiensis (female). 57. Dorsal view of idiosoma; 58. Genu, tibia and basitarsus of leg IV; 59. Chelicera; 60–63. Euseius tubuliferus (female). 60. Ventral view of opisthosoma; 61. Genu, tibia and basitarsus of leg IV; 62. Spermatheca; 63. Chelicera.

Tables

TABLE 3. Differences in diagnostic characters between Amblyseiulella gangtokiensis sp. nov. and A. heveae (Oudemans, 1930b); A. nucifera Gupta, 1979; A. chombongensis Ryu and Lee, 1995; A. odowdi Ryu and Lee, 1995

Characteristics	Amblyseiulella gangtokiensis sp. nov.	A. heveae	A. nucifera	A. chombongensis	A. odowdi
j1	30–34	32–33	28–30	34–35	32–34
j3	64–66	72–75	68–70	68–70	68–70
j4	4–6	6–7	4–6	6–8	5–7
j5	4–6	6–7	4–6	6–8	5–7
j6	7–10	11–12	4–6	10–12	14–16
J5	4–6	4–5	4–5	6–8	5–6
z2	19–21	20–23	16–18	18–20	24–26
z4	24–28	37–38	30–32	33–35	58–60
z5	4–6	6–7	4–5	6–8	6–8
Z1	6–8	10–11	4–5	8–10	10–12
Z4	68–72	73–76	68–70	80–82	47–50
Z5	78–82	80–85	76–78	100–102	67–70
s4	82–85	90–93	80–82	90–94	81–82
S2	44–48	45–48	40–42	46–48	54–56
r3	56–59	65–68	56–58	51–53	53–55
R1	24–27	48–50	28–30	22–24	36–38
JV5	52–55	60–70	-	69–70	53–55
Vsl	122–126	117–120	80–82	-	-
Vsw at ZV2	67–70	75–78	60–62	-	-
Vsw at anus	58–62	58–60	-	-	-
PMS long	42–45	30–31	-	-	-
FD no. of teeth	2	6	-	6	5
MD no. of teeth	1	3	-	2	2
SgeIV	36–40	48–52	44–46	48–50	36–38
StiIV	68–72	68–75	64–66	66–68	53–55
StaIV	44–46	43–45	36–38	42–44	36–38
Tip of macrosetae	All knobbed	All knobbed	All knobbed	All knobbed	All blunt
Shape of spermatheca	Cup shaped	Cup shaped	Cup shaped with distinct neck	Cup shaped	Cup shaped

TABLE 3. Differences in diagnostic characters between Amblyseiulella gangtokiensis sp. nov. and A. heveae (Oudemans, 1930b ); A. nucifera Gupta, 1979 ; A. chombongensis Ryu and Lee, 1995 ; A. odowdi Ryu and Lee, 1995

Sources of measurement: Original paper; ‘-’: not available