Amblyseius andersoni ( Chant, 1957 )

Amblyseius andersoni ( Chant, 1957) View in CoL ( fig. 1 View Fig )

Typhlodromus andersoni Chant, 1957: 296 .

Amblyseius andersoni View in CoL : Athias-Henriot, 1958: 33; Kolodochka, 1978: 27; Ghiliarov et al., 1978: 237; Kolodochka, 2006: 227; Chant & McMurtry, 2007: 75; Papadoulis et al., 2009: 48.

Typhlodromus (Amblyseius) andersoni, Chant, 1959: 92 .

Typhlodromus andersoni : Hirschmann, 1962, Tab. 11, fig. 208.

Typhlodromus (Typhlodromus) andersoni : Westerboer & Bernhard, 1963: 682.

Material. Type. Holotype}: Canada, British Columbia, Rosedale , on prune ( Prunus sp. ), (collection date unknown), specimen #6545 (not examined) ( CNC).

Non-type. 1422 specimens (1152}, 270 {) — Autonomous Republic of Crimea, Cherkassy, Chernihiv, Donetsk, Kyiv, Kherson, Khmelnitsky, Luhansk, Lviv, Mykolaiv, Poltava, Rivne, Sumy, Ternopil, Transcarpathian, Vinnitsa, Zhytomyr Regions.

R e d e s c r i p t i o n. F e m a l e. The dorsal shield ( fig. 1, 1 View Fig ) is moderately sclerotised, elongated-oval, caudally widened, partly covered with thin reticulate sculpture; 7 pairs of solenostomies (it, iv, id, isc, il, is, ic). The setae of AM1, AL4, PM3 and PM3 are significantly longer than the others. The setae PM3 and PM4 are serrated, the rest are smooth. Setae AM1 extend far beyond the thecae of setae AL1. Setae AL1 equal half the distance to thecae AL3. Seta AL3 longer than AL1. Seta PL1 longer than PL2 and PL3. Peritremes long, reaching the bases of setae AD1. Sternal shield with uneven posterior margin, without posterolateral processes. The ventrianal shield is some wider than the genital shield, elongated with lateral notches, sculptured in the form of thin transverse lines; anal pores close together, semilunar ( fig. 1 View Fig , 2 View Fig ). The anterior metapodal shield is narrow, 1.5 times shorter than the posterior one ( fig. 1 View Fig , 3 View Fig ). The posterior part of the peritremal shield is slightly curved, beak-shaped at the end, with a pore ( fig. 1 View Fig , 4 View Fig ). There are 9 teeth on Df, and 3 on Dm ( fig. 1 View Fig , 5 View Fig ); very rarely one middle tooth on one Dm may be reduced. The spermatheca is small, a cup-shaped funnel, an atrium on a short neck ( fig. 1 View Fig , 6 View Fig ). Leg IV has 3 macrochaetes — on the tarsus and genu almost equal in length, on the tibia somewhat shorter ( fig. 1 View Fig , 7 View Fig ); on the knee and shin of the 3rd pair of legs, on the knees of the 2nd and 1st pairs of legs, also along a short macrochaete.

Measurements: Lds 350, Wds 210, LVAS 128, Wvas 90, Lian 22, LTAR IV 134; setae length: AD1 28; AD2 7; AD3 7; AD4 8; PD2 8; PD4 10; АМ1 39; АМ2 7; AL1 14; АL3 22; АL4 78; РL1 25; РL2 13; РL3 10; PМ1 10; РМ3 72; РМ4 140; АS 26; РS 17; РV 72; MCH IV: GE 63, TI 50, ta 67; MCH III: GE 37, TI 27; MCH II: GE 32; MCH I: GE 27.

M a l e. Preanal setae 3 pairs; anal pores large semilunar ( fig. 1 View Fig , 8 View Fig ). The spermatodactyl L-shaped, beak-shaped at its end ( fig. 1 View Fig , 9 View Fig ). Lds — 270.

D i f f e r e n t i a l d i a g n o s i s. The differences between the very closely related Amblyseius andersoni and A. wainsteini will be discussed in detail in the section on the second species. A. rademacheri is also similar to both A. andersoni and A. wainsteini , but to a lesser extent. It is reliably distinguished from both species by the presence of thickened and roughly serrated setae PM3 and PM4, as well as a frontally distinctly tapering dorsal shield without lateral notches and anal pores located at an angle to each other.

Besides that A. andersoni and A. wainsteini both similar to A. krantzi and differ from it in the presence of lateral notches on the dorsal shield at level of the PS setae, as well by the presence of 6 instead of 7 of pairs of dorsal solenostomes. Slit-like anal pores, and the absence of a pair of setae MV1 on the membrane surrounding the ventrianal shield complete the list of differences between these two species.

D i s t r i b u t i o n, h a b i t a t, o c c u r r e n c e. Europe (24 countries), South Caucasus ( Azerbaijan, Armenia, Georgia), East Asia ( China), Japan, Western Asia ( Turkey, Syria), North America ( Canada, USA), South America ( Brazil), North Africa ( Algeria, Morocco), Australia. In Ukraine: Polissia, Transcarpathia (prefers trees and shrubs, less often found on herbs, common in gardens, occasionally in moss, soil, litter); steppe zone (usually inhabits perennial grasses), Autonomous Republic of Crimea: Yalta (on grasses), the second ridge of the Crimean Mountains (on shrubs). In Ukraine it is often found in natural and artificial plant communities, including in industrial gardens treated with pesticides ( Akimov et al., 1993), although it is usually not found in significant quantities on one plant.

Note 1. Description, morphometry and illustrations are given based on non-type specimens from the Kyiv Region after comparing them with vouchers from the collection of B. A. Wainstein and illustrations of this type in publications by various authors .

Note 2. This is one of the most active acariphagous mites used to protect plants from plant consuming mites in greenhouses. For these purposes, it is propagated by feeding it on spider mites or acaroid mites ( Akimov & Kolodochka, 1991).