Amblyseius herbicolus (Chant)

K, Ismail Döker, VangansbekeK, Dominiek & K, Jonas Merckx, 2022, New records of phytoseiid mites (Acari: Mesostigmata: Phytoseiidae) in Belgium with an identification key to Belgian species, Acarologia 62 (4), pp. 1070-1083 : 1071-1073

Amblyseius herbicolus (Chant)

Typhlodromus (Amblyseius) herbicolus Chant, 1959: 84 .

( Figure 1)

Material examined — Five females from cherry laurel, Prunus laurocerasus L. ( Rosaceae )

in Ghent, Belgium, (51°03′04.4″N, 3°45′16.9″E), 27 September 2021, collector D. Vangansbeke.

Re-description — Female (n = 5) – Dorsum ( Figure 1a). Dorsal shield smooth with seven pairs of solenostomes (gd1, gd2, gd4, gd5, gd6, gd8 and gd9). Length of dorsal shield 388 (385–390), width (at level of s4) 252 (250–255), width (at level of S2) 248 (240–260). Dorsal setae smooth except Z4 and Z5 slightly serrated; measurements of setae as follows: j1 39

(38–40), j3 43 (40–45), j4 7 (5–8), j5 6 (5–8), j6 6 (5–8), J2 8 (8–10), J5 7 (5–8), z2 12 (10–13),

z4 9 (8–10), z5 7 (5–8), Z1 8 (6–8), Z4 103 (98–105), Z5 266 (250–270), s4 98 (95–105), S2 11 (10–13), S4 10 (8–13), S5 9 (8–10), r3 11 (10–13), R 1 9 (8–10). Peritreme extending between setae j1.

Venter ( Figure 1b, c). All ventral shields smooth. Distances between st (1– st3) 71 (69–73),

st2– st2 77 (75–80), st5– st5 72 (67–75). Ventrianal shield vase-shaped with three pairs of preanal setae (ZV 2 in left side out of shield in one specimen) and one pair of large crescentic pores (gv3), distance between pre-anal pores 25 (23–28). Length of ventrianal shield 120 (115–125), width at level of setae ZV2 53 (49–56), width at level of paranal setae 72 (69–74).

Setae ZV1, ZV3, JV4 and JV5 integument surrounding ventrianal shield JV (4 absent in right side of a specimen). Setae JV5 smooth 54 (53–55) in length.

Chelicera ( Figure 1d). Fixed digit of chelicera with 12 teeth; movable digit with four teeth.

Spermatheca ( Figure 1e, f). Calyx of spermatheca trumpet-shaped, elongated, flaring distally 29 (28–30) in length. Atrium enlarged, wider than base of calyx. Major duct long;

minor duct well-developed.

Legs. GeII, GeIII and GeIV each with seven setae. All legs with macrosetae. Measurements of macrosetae as follows: SgeI 47 (45–48), SgeII 39 (38–40), SgeIII 47 (45–48), StiIII 39

(38–40), StIII 37 (35–38), SgeIV 113 (110–118), StiIV 81 (80–83) and StIV 70 (68–73).

Remarks — Amblyseius herbicolus is a new record for the Belgian fauna. Morphological characters and measurements of the current specimens are very close to those of the original description and re-descriptions ( Chant 1959 ; Denmark and Muma 1989 ; Demite et al. 2017 ;

Zannou et al. 2007 ; Guanilo et al. 2008a, b; Ferragut et al. 2010 ; Akyazı et al. 2016 ; Kreiter et al. 2018 ; Döker et al. 2020 ; Liao et al. 2020). Ventral seta ZV 2 in one of the examined specimens in the left side is inserted on integument surrounding ventrianal shield (out of ventrianal shield, see Figure 1c). In addition, setae JV4 is absent in the right side of the same specimen. Based on our best knowledge, these variations are reported for the first time for A.

herbicolus .