Typhlodromus (Anthoseius) suecicus ( Sellnick, 1958 )

Faraji, Farid & Hoekstra, Paul H., 2021, Some new species records of the predatory mite family Phytoseiidae (Acari: Mesostigmata) from The Netherlands, Soil Organisms 93 (1), pp. 35-57 : 51

Typhlodromus (Anthoseius) suecicus ( Sellnick, 1958)

For other names and synonyms see Demite et al. (2021)

( Fig. 11 : A–E)

Female– One specimen measured.

Idiosomal setal pattern: 12A:8A/JV:ZV.

Dorsal idiosoma ( Fig. 11A ) – Dorsal shield reticulated 385 long and 180 wide at j 6 level, with 20 pairs of dorsal setae (r 3 and R 1 included); dorsal shield setae smooth, except for Z 5 slightly serrated; lengths j 1 21, j 3 24, j 4 20, j 5 17, j 6 24, J 2 22, J 5 9, z 2 21, z 3 23, z 4 24, z 5 21, Z 4 41, Z 5 47, s 4 25, s 6 32, S 2 35, S 4 28, S5 22; setae r 3 23 and R 1 21 on lateral integument; dorsal shield with 3 pairs of solenostomes (gd 2, gd 6, gd 9) and 14 pairs of small poroids.

Peritreme – Extending to the level between setae j 1 and j 3 ( Fig. 11A ).

Ventral idiosoma ( Fig. 11B ) – Posterior margin of sternal shield irregular wavy, 63 long, 63 wide at level of setae ST 2, two pairs of setae and two pairs of pores (iv 1 and iv 2), ST 1 27, ST 2 23; distances between ST 1 –ST 2 40, ST 1 –ST 1 49 and ST 2 –ST 2 58; metasternal setae ST 3 22, ST 4 24 and a pair of associated pores (iv 3) on small platelets; genital shield smooth width at widest point 66, ST 5 22; two pairs of metapodal shields, primary 38 long and accessory 13 long; ventrianal shield pentagonal constricted at JV 2 ( Fig. 11B ), with some horizontal striae, length 107, width at level of setae ZV 2, 70, and width at level of paranal setae 74; with three pairs of preanal setae (JV 1 17, JV 2 16, ZV 2 17); four pairs of setae surrounding ventrianal shield on integument (JV 4 17, JV 5 27, ZV 1 14, ZV 3 16), five pairs of pores surrounding ventrianal shield. Ventrianal shield with a pair of small round pores (gv 3) wider apart from the distance between insertions of JV 2, posteromesad to JV 2, distance between these pores 42.

Spermatheca – Calyx cup-shaped 14 long, 12 in diameter at the middle part of the calyx; atrium inserted at base of the calyx ( Fig. 11C ).

Chelicera – Fixed digit 24 long with 4 teeth and a pilus dentilis; movable digit 27 long with 1 tooth ( Fig. 11D ).

Legs – Leg IV with one macroseta knobbed apically, StIV 24 ( Fig. 11E ); legs I, II and III with no recognizable macrosetae; length of legs from the base of coxae to the tip of claws: leg I 285, leg II 243, leg III 268, leg IV 313; chaetotactic formulae of genua and tibiae I–II–III–IV with 10 (2-2/1, 2/1-2) – 6 (1-2/0, 2/0-1) – 6 (1-2/0, 2/0-1) – 7 (1-2/0, 2/1-1) and 10 (2-2/1, 2/1-2) – 7 (1-2/1, 1/1-1) – 7 (1-2/1, 1/1-1) – 6 (1-1/0, 2/1-1) setae respectively.

Distribution – Finland, Norway, Russia, Sweden and The Netherlands (this study).

Specimen examined – One female, 04 July 2004, Birch tree ( Betula pendula ), Science park , Amsterdam, The Netherlands (52°21’20.8”N 4°57’34.2”E), collector: Farid Faraji.

Remarks – This is a new species record for Dutch fauna. The specimen found in The Netherlands has slightly longer dorsal shield setae compare to those re-described by Evans & Edland (1998) from Norway. For example, Z 4 41 vs 25–32 and Z 5 47 vs 40–43. The number of setae on genu III is mistakenly mentioned 7 in the text while in their key they correctly mentioned 6 setae.

Figures

Figure 11. Typhlodromus (Anthoseius) suecicus (Sellnick) (Female): (A) Idiosoma, dorsal view; (B) Idiosoma, ventral view; (C) Spermatheca; (D) Chelicera; (E) Tarsus leg IV.