Amblyseius krantzi ( Chant, 1959 )

Kolodochka, L. A. & Gwiazdowicz, D. J., 2016, Redescription of three species of phytoseiid mites (Acari, Mesostigmata) from Poland, Acarologia 56 (4), pp. 625-632 : 626-628

Amblyseius krantzi ( Chant, 1959)

( Figure 1 )

Typhlodromus (Amblyseius) berlesei Chant, 1957: 292- 293 , Fig. 10;

Typhlodromus (Amblyseius) krantzi Chant, 1959: 83 , Figs. 158, 159;

Amblyseius (Amblyseius) krantzi (Chant) , Muma, 1961: 287.

Amblyseius krantzi (Chant) , Chant, Hansell, 1971: 708, 734, Figs. 16-21.

Amblyseius krantzi (Chant) , Begljarov, 1981: I: 31, 39, Fig. 39.

Amblyseius (Typhlodromips) frutexis Karg, 1991: 19 , new syn.

Amblyseius frutexis Karg, 1993: 186 , Fig. 145 b-d, new syn.

For more see Demite et al., 2015

Material examined — One female, from soil and litter, no MF 29, data 21.07.2011, Ojców National Park (50°12’N, 19°49’E), coll. D.J. Gwiazdowicz.

Description. Female. Dorsal shield ( Fig. 1A ) oval, without constrictions at level of R 1, weakly or moderately sclerotized, smooth, with muscle marks (the largest are drown), 6 pairs of small solenostomes (gd1, gd4, gd5, gd6, gd8, gd9), and 17 pairs of setae acute and contrasting in length. Setae s4, Z4, Z5 much longer than others, j1 and j3 medium; the rest very short. Dorsal setae smooth except Z5 weekly serrated. Seta j3 longer than distance from own base to base of seta z2. Sternal shield with 2 pairs of solenostomes and 3 pairs of setae (St1-St3); St4 placed on separate metasternal platelets ( Fig. 1B ). Genital shield with one pair of seta (Ge). Ventrianal shield elongate with salient frontal margin, vase-shaped in form, smooth, narrower than genital shield. Three pairs of preanal setae JV1, JV2, ZV2, one pair of para-anal setae (Pa) and unpaired post-anal (Pst) on ventrianal shield ( Fig. 1B ). Anal pores large, crescent shaped, transversely aligned and closely associated with setae JV2 ( Fig. 1C ). Two pairs of light oval muscle maculae along both margins of caudal part of ventrianal shield. Setae ZV1, JV4 and JV5 on the integument surrounding the ventrianal shield. Seta ZV3 absent. All ventral setae thin, acute, and smooth. Chelicerae normal in relation to body size. Fixed digit with 8 denticles (6 large and 2 small), movable digit with 3 ( Fig. 1D ). Metapodal plates elongate, anterior platelets smaller and narrower than posterior plates ( Fig. 1E ). Funnel (infundibulum) of spermatheca cup-shaped connected to large atrium by a short cervix ( Fig. 1F ). Peritremes long, extending beyond bases of setae j1 ( Fig. 1A ). Posterior part of peritremal shield as on Fig. 1G . Leg IV with three pointed and smooth macrosetae: longest on basitarsus and genu, and shorter on tibia ( Fig. 1H ). Genu and tibia of leg III, genu II, and genu I each with one short macroseta. Genu II with 8 setae (1 - 2, 2 / 1, 1 - 1).

Measurements — length of dorsal shield, Lds 380; width of dorsal shield at R 1 level, Wds 250; length of ventrianal shield, Lvas 118; max width of ventrianal shield, Wvas 72; distance between anal pores, Lian 32; length of tarsus of leg IV, Ltar IV 134.

Setae — j1 27, j3 43, j4 6, j5 5, j6 6, J2 7, J5 7, s4 70, z2 8, z4 7, z5 5, S2 9, S4, S5 6, Z1 8, Z4 94, Z5 117, r3 16, R1 9, JV5 39; macrosetae on leg IV, MCh IV: ge 69, ti 51, tar 72; MCh III: ge 37, ti 30; MCh II: ge 36; MCh I: ge 37 .

Males were absent in investigated material.

Notes — The absence of ventral setae ZV 3 in A. krantzi is a unique feature which clearly separate it from the other closely related species. Amblyseius krantzi resembles A. rademacheri ( Dosse, 1958) and A. andersoni ( Chant, 1957) by having dorsal setae s4, Z4, Z5 distinctly longer than others, j1 and j3 medium, the rest of dorsal setae very short; and large anal pores.

Amblyseius krantzi differs from the former in having the dorsal shield smooth (in A. rademacheri dorsal shield reticulate), by presence of 6 pairs of solenostomes (gd2 absent) instead of 7 as in A. rademacheri , by ventrianal shield narrower than genital shield, by large anal pores closely associated with setae JV2 and transversely aligned with them (in A. rademacheri scutiform ventrianal shield broader than genital shield, and anal pores inclined and not closely associated and slightly posterior to level of setae JV2 bases), by atrium of spermatheca with short neck (in A. rademacheri atrium sedentary) and by presence of 3 teeth on movable cheliceral digit (instead of 2 as in A. rademacheri ).

Amblyseius krantzi distinctly differs from A. andersoni by dorsal shield without constrictions at level setae R1, by large oval anal pores associated with setae JV2 instead of in A. andersoni dorsal shield with constrictions, and fissured anal pores not associated with preanal setae.

This rare species is known from trees, shrubs, and herbs in Alaska; Canada - British Columbia, Ontario; Kazakhstan; Russia - Moscow Province, Yaroslavl province; USA - Washington ( Demite et al., 2015); Ukraine ( Kolodochka, 2006).

Figures

FIGURE 1: Amblyseius krantzi (Chant, 1959). Female: A – dorsal shield; B – fragment of ventral body surface; C – setae JV2 and anal pores; D – chelicera; E – metapodal plates; F – spermatheca; G – caudal part of peritremal shield; H – fragment of leg IV (bottom-up: tibia, genu, tarsus).