Amblyseius omaloensis Gomelauri, 1968

Khaustov, Vladimir A., 2020, Review of Amblyseius Berlese (Acari: Phytoseiidae) in Western Siberia, Russia, Acarologia 60 (4), pp. 769-805 : 789-795

publication ID	https://doi.org/ 10.24349/acarologia/20204401
persistent identifier	https://treatment.plazi.org/id/62492C7E-F815-FFDF-FE3D-FA1BFAE67FC0
treatment provided by	Marcus
scientific name	Amblyseius omaloensis Gomelauri
status

Treatment

Amblyseius omaloensis Gomelauri View in CoL

Amblyseius omaloensis Gomelauri, 1968a: 702 View in CoL

Amblyseius benefactor Meshkov, 1991: 139 View in CoL (synonymized by Meshkov 1999: 430).

World distribution — Georgia, Russia, Lithuania, Moldova ( Kolodochka 2006; Demite et al. 2020).

Material examined — seven females, Russia, Tyumen Province, Uspenka state zoological reserve, 57°04 ′ N, 65°04 ′ E, 02 October 2017, 06 September 2019, A. Khaustov coll., from moss.

Redescription — Female ( Figs. 16 View Figure 16 , 17 View Figure 17 , 18 View Figure 18 , 19 View Figure 19 , 20 View Figure 20 , 27C View Figure 27 ) (n = 4)

Idiosomal setal pattern – 10A:9B/JV–3:ZV.

Dorsal idiosoma ( Figs. 16A View Figure 16 , 20A View Figure 20 ) – Dorsal shield oval, smooth, 353 (340-371) long and

232 (229-236) wide; with 19 pairs of setae (included r3 and R1), all setae smooth, except Z4 and Z5, slightly barbed; length of setae: j1 26 (25-27), j3 42 (40-44), j4 6 (5-6), j5 5 (5-6), j6 5 (5-6), J2 5 (5-6), J5 9 (8-10), z2 15 (15-16), z4 15 (13-16), z5 5 (5-6), Z1 6 (5-6), Z4 91 (90-92),

Z5 140 (132-147), s4 63 (62-67), S2 9 (8-10), S4 8 (7-9), S5 8 (7-8); setae r3 18 (17-18) and

R1 14 (13-14) on lateral soft cuticle; dorsal shield with seven pairs of solenostomes gd (1, gd2, gd4, gd5, gd6, gd8, gd9) and 16 pairs of poroids.

Gnathosoma ( Figs. 17A, 17C, 17E, 17F View Figure 17 ) – Anterior margin of epistome bump-like and smooth. Hypostomal groove with seven transverse rows of denticles, each row with two teeth; subcapitular setae h1 31 (30-32), h2 25 (24-25), h3 25 (24-25), palp coxal setae (pc) 31 (30-31). Chaetotaxy of palps: trochanter with two setae v1, v2; femur with five setae, thickened and apically spatulate antero-lateral al, three dorsal (d1, d2, d3) and one postero-lateral (pl); genu with six setae, antero-lateral setae (al1 and al2) thickened, three dorsal setae d (1, d2, d3) and one postero-lateral (pl); tibia with 14 setae, one antero-lateral (al), eight dorsal d1 – 8, two setae di-1, di-2, arise from the dorsal surface at the distal end, two ventral v (1, v2) and one postero-lateral (pl); tarsus with 15 setae (six simple d1, d2, d3, v1, v2, v3; nine stout setae with rounded tips di-1 to di- 9) and two-tined apotele ( Fig. 17F View Figure 17 ).

Chelicera ( Figs. 17B View Figure 17 , 20C View Figure 20 ) – fixed digit 30 (28-34) long, with 15-16 teeth and pilus dentilis; movable digit 34 (34-36) long, with three teeth.

Ventral idiosoma ( Figs. 16B View Figure 16 , 20B View Figure 20 ) – Tritosternum with paired pilose laciniae 81-84, fused basally 34-35, columnar base 13-15 × 10-12 wide. Sternal shield smooth, 65 (64-66) long and 68 (67-69) wide, with three pairs of setae ST1 32 (27-35), ST2 26 (24-30), ST3 26 (23-27) and two pairs of lyrifissures iv1, iv2. Setae ST4 27 (25-32) situated on small separate metasternal platelets, each with one pore iv3.

Genital shield smooth, 71 (70-71) wide at level of base of setae ST5 26 (24-28), para-genital poroids iv5 on soft cuticle.

Opisthosomatic venter with two pairs of elongated metapodal platelets, primary 20 (19-21) and accessory 14 (14-15) long; four pairs of setae, ZV1 16 (16-17), ZV3 12 (10-13), JV4 14 (13-14), JV5 66 (63-70) long, all smooth, and five pairs of poroids.

Ventrianal shield pentagonal in shape, reticulate, 115 (113-117) long and 93 (91-94) wide at level of setae ZV2, with three pairs of pre-anal setae JV1 18 (17-19), ZV2 18 (17-19), JV2 21 (20-21), with small rounded pre-anal pores gv3 (distance between pores 43 (42-45)); para-anal setae 19 (18-20) and post-anal setae 20 (19-21).

Peritreme ( Figs. 16A View Figure 16 , 17G View Figure 17 , 20A View Figure 20 ) – extends anteriorly to setae j1.

Spermatheca ( Figs. 17D View Figure 17 , 20D View Figure 20 ) – Calyx tube-like, 25 (24-25) long and at the opening 6 (6-7) wide; atrium C-shaped, connected without neck with calyx; major duct thick, minor duct not visible.

Legs ( Figs. 18 View Figure 18 , 19 View Figure 19 ) – Legs I 344 (340-349) and IV 350 (345-353) longer than legs II 278 (276-279) and III 271 (267-273). Chaetotaxy normal for phytoseiid mites: Leg I: coxa 0 0/1

0/1 0, trochanter 1 0/1 0/2 1, femur 2 3/1 2/2 2, genu 2 2/1 2/1 2, tibia 2 2/1 2/1 2. Leg II: coxa

0 0/1 0/1 0, trochanter 1 0/1 0/2 1, femur 2 3/1 2/1 1, genu 2 2/0 2/1 1, tibia 1 2/1 1/1 1. Leg III: coxa 0 0/1 0/1 0, trochanter 1 0/1 0/2 1, femur 1 2/1 1/0 1, genu 1 2/1 2/0 1, tibia 1 1/1 2/1 1. Leg IV: coxa 0 0/1 0/0 0, trochanter 1 0/1 0/2 1, femur 1 2/1 1/0 1, genu 1 2/1 2/0 1, tibia 1 1/1 2/0 1. Chaetotaxy of tarsi II-IV typical for Phytoseiidae and bears 18 setae 3 3/2 3/2 3 + mv, md. Tarsus I with 37 setae, excluding apical sensorial setal cluster. Setae d3 13 with rounded tip, d4 28-32. Apical sensorial setal cluster (27C) includes 10 short setae of different shape. Setae df-1 (13), df-3 (7) and df-7 (8) finger-shaped with blunt tips. Setae df-2 (4), df-5 (6), df-6 (16) and df-8 (9-10) baculiform with rounded tips, setae df-8 usually curved. Setae df-4 (9), df-9 (8) spur-like with lobe-like tips, setae df-10 (5) situated between df-4 and df-9 also spur-like with acuminate tip. Measurements of macrosetae as follows: SgeII 30 (28-31), SgeIII 34 (32-35), SgeIV 75 (70-80), StiIV 62 (60-64), StIV 59 (58-59). All macrosetae are acuminate.

Remarks — Amblyseius omaloensis is known only from Europe ( Demite et al., 2020). All measurements and morphological characters of Siberian specimens are very close to description of Meshkov (1991). It is the first record of A. omaloensis in Asian Russia.