Amblyseiulella cancellatus, 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 : 206-208

Amblyseiulella cancellatus sp. nov.

( Figs. 6–10 ; 53–56)

Diagnosis. Dorsal opisthosoma reticulated; all lateral setae serrated while setae j4, j5, j6, J5 and z5 smooth; posterior margin of sternal shield concave and wavy; one pair of long metapodal plates; fixed digit of chelicera bidentate and movable digit unidentate; leg IV with three blunt macrosetae; spermatheca cup shaped with nodular atrium.

Description. Female (n = 5). Dorsum ( Fig. 6 ). Dosal idiosomal chaetotaxy 10A:9B. Dorsal shield 313 (312– 316) long and 188 (186–190) wide, well sclerotized, reticulated posteriorly, 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 30 (29–32), j3 53 (52–55), j4 8 (7–10), j5 8 (7–10), j6 15 (14–18), J5 5 (4–6), z2 20 (19–21), z4 38 (35–39), z5 8 (7–9), Z1 10 (9–12), Z4 38 (36–40), Z5 56 (55–58), s4 72 (70–73), S2 50 (49–52), r3 45 (44–46), R1 28 (26–29). All the dorsal setae serrated medium to long while the setae j4, j5, j6, J5 and z5 are smooth and short, seta Z5 is longest.

Peritreme ( Fig. 6 ). Extending beyond the base of j 1.

Venter ( Fig. 7 ). Sternal shield smooth, 61 (60–63) long, 77 (75–78) 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) 30 (30–32) on unsclerotised kidney shaped metasternal plate; posterior margin of sternal shield concave and wavy, lateral margin strongly indented. Distances between st2-st2 61 (60–63), st5-st5 75 (73–76). Genital shield smooth, wider at posterior part and posterior margin almost straight. Two pairs of elongated curved metapodal shields present; primary metapodal shield 45 (43–46) long, 2 (2–3) wide. Ventrianal shield smooth with three pairs setae, shield 112 (107–110) long, 65 (64–67) wide at level of ZV2 setae and 54 (53–56) wide at anus level with three pairs of pre-anal setae JV1 22 (21–23), JV2 21 (20–22), ZV2 21 (20–22) and one pair of pre-anal pores (gv3) 40 (39–42) apart well below JV2. Membrane surrounding ventrianal shield with four pairs of setae ZV1 22 (20–22), ZV3 15 (13–16), JV4 16 (14–17) and JV5 41 (40–42); JV5 long and smooth.

Chelicera ( Fig. 8 ). Fixed digit 27 (25–28) long, bi-dentate with distinct pilus dentilis, movable digit 27 (25–28) long with one tooth.

Spermatheca ( Fig. 9 ). Calyx cup shaped, darken portion at the base of vesicle 8 (6–10) long, atrium nodular, major duct and minor duct clearly visible.

Leg ( Fig. 10 ). Length of leg I: 313 (311–314), leg II 238 (235–240), leg III 263 (260–265) and leg IV 325 (322–330). Chaetotactic formula of Sge II 1-2/0 2/1-1 and Sge III 1-1/1 2/1-1. Leg IV with three pointed macrosetae of following lengths: SgeIV 40 (40–43), StiIV 38 (37–39), StaIV 55 (54–58).

Type specimens. Holotype: female (Acarol.lab/ BCKV/8643 /2021) deposited in the (NZC), Zoological Survey of India, Kolkata, collected from unidentified climber, at Plant Conservatory , Bulbul : 27°21’36”N, 88°37’40”E, 1975 m AMSL, East Sikkim, Sikkim on 29 th March , 2021; 4 paratype females (Acarol.lab/ BCKV/8644 /2021) with same collection data as holotype deposited in Acarology laboratory of BCKV, Mohanpur.

Etymology. The specific name cancellatus refers to the unique reticulation pattern of dorsal opisthosoma of this new species.

Remarks. The new species Amblyseiulella cancellatus sp. nov. is different from all the 12 species described under this species subgroup ( Chant & McMurtry, 2003) by having unique type of reticulation on dorsal opisthosoma. However, the new species is closed to A. chombongensis Ryu & Lee, 1995 ; A. odowdi Ryu & Lee, 1995 ; A. paraheveae ( Wu & Ou, 2002) ; A. thoi Ehara, 2002 by having similar type of ventral plates and dorsal setations. The new species differs from these close species by dorsal ornamentation (reticulated versus smooth or sclerotized), length of dorsal setae, 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 2 .

Figures

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

Tables

TABLE 2. Differences in diagnostic characters between Amblyseiulella cancellatus sp. nov. and A. chombongensis Ryu and Lee, 1995; A. odowdi Ryu and Lee, 1995; A. paraheveae (Wu and Ou, 2002); A. thoi Ehara, 2002

Characteristics	Amblyseiulella cancellatus sp. nov.	A. chombongensis	A. odowdi	A. paraheveae	A. thoi
Dorsum	Opithosoma reticulated	Smooth	Almost smooth	Smooth	Smooth
j1	29–32	34–35	32–34	31–40	28–31
j3	52–55	68–70	68–70	70–75	57–60
j4	7–10	6–8	5–7	5	6–8
j5	7–10	6–8	5–7	5–6	6–8
j6	14–18	10–12	14–16	6–10	16–18
J5	4–6	6–8	5–6	5	4–6
z2	19–21	18–20	24–26	21	20–22
z4	35–39	33–35	58–60	33–40	48–50
z5	7–9	6–8	6–8	5–7	5–7
Z1	9–12	8–10	10–12	6–10	8–10
Z4	46–50	80–82	47–50	71–80	61–64
Z5	70–74	100–102	67–70	82–86	72–74
s4	69–71	90–94	81–82	92–97	75–77
S2	49–52	46–48	54–56	42–44	46–49
r3	44–46	51–53	53–55	57–67	45–47
R1	24–27	22–24	36–38	31	30–33
JV5	28–32	69–70	53–55	61–67	51–55
Vsl	107–110	-	-	110–120	-
Vsw at ZV2	64–67	-	-	63–75	-
Vsw at anus	54–57	-	-	-	-
FD no. of teeth	2	6	5	8	5
MD no. of teeth	1	2	2	3	2
SgeIV	40–43	48–50	36–38	46–50	40–42
StiIV	54–58	66–68	53–55	65–71	57–61
StaIV	37–39	42–44	36–38	41–42	38–40
Shape of s permatheca	Cup shaped with nodular atrium	Cup shaped with nodular atrium	Cup shaped nodular atrium	Cup shaped	Disc like cervix with nodular atrium

TABLE 2. Differences in diagnostic characters between Amblyseiulella cancellatus sp. nov. and A. chombongensis Ryu and Lee, 1995; A. odowdi Ryu and Lee, 1995 ; A. paraheveae ( Wu and Ou, 2002) ; A. thoi Ehara, 2002

Sources of measurement: Original paper of Ryu and Lee, 1995; Wu and Ou, 2002; Ehara, 2002; ‘-’: not available