Amblyseius impressus, Denmark & Muma, 1973

Lofego, Antonio Carlos, Barbosa, Marina Ferraz De Camargo, Demite, Peterson Rodrigo & Moraes, Gilberto José De, 2024, Phytoseiidae (Acari: Mesostigmata) of the subfamily Amblyseiinae from Brazil, Zootaxa 5439 (1), pp. 1-306 : 40

Amblyseius impressus Denmark & Muma ( Figure 26)

Amblyseius impressus Denmark & Muma, 1973: 246.

Amblyseius impressus . — Moraes et al., 1986: 16, 2004b: 30; Chant & McMurtry, 2004a: 199; 2007: 78; Rocha et al., 2015: 24. Amblyseius (Amblyseius) impressus . — Denmark & Muma, 1989: 39.

Specimens measured. SP (6; in addition to the holotype, in square brackets).

Dorsal shield of female smooth, 430 (410–445) [408] long and 295 (290–300) [314] wide. Setal lengths: j1 37 (32– 40) [36], j3 49 (47–52) [49], j4 6 (6–7) [7], j5 5 (5–6) [5], j6 9 (7–11) [8], J2 9 (8–9) [10], J5 9 (8–9) [8], z2 12 (11– 14) [11], z4 12 (10–13) [10], z5 7 (6–9) [5], Z1 11 (10–11) [11], Z4 154 (147–160) [140], Z5 292 (280–307) [306], s4 117 (115–129) [110], S2 11 (10–12) [12], S4 12 (11–13) [11], S5 11 (11–12) [13], r3 16 (11–17) [16] and R1 11 (10–12) [13]. Peritreme extending to level of j1. Distances between st1–st3 77 (75–80), st2–st2 84 (80–87), st5–st5 84 (80–90). Ventrianal shield 141 (135–147) [144] long, 93 (87–95) [89] wide at level of Zv2 and 95 (85–100) at anus level. Spermathecal calyx shallow cup-shaped, 7 (6–7) long; atrium nodular. Fixed cheliceral digit 40 (36–45) long, with 12–13 teeth; movable digit 52 (51–53) long, with four teeth. Macrosetae of legs I–IV, sharp-tipped; SgeI 46 (45–47), SgeII 47 (42–50) [46], SgeIII 53 (50–57) [56], SgeIV 136 (127–147) [138], StiIII 53 (52–65), StiIV 89 (72–100) [98] and StIV 82 (77–85) [91] .

Distribution in Brazil. Minas Gerais (Silva et al., 2010; Carvalho et al., 2012), Rio Grande do Sul ( Rocha et al., 2015), São Paulo ( Denmark & Muma, 1973; Gondim Jr. & Moraes, 2001) and Tocantins ( Cruz et al., 2012; Cañarte et al., 2020).

Distribution elsewhere. Not reported.

Remarks. Species described from Brazil. The measurements of the specimens examined are similar to those of the original description. However, an examination of a paratype showed the spermatheca to be slightly different from what was it shown in the illustration of the original description. Little morphological differences may be recognized among A. chiapensis , A. impressus and A. pravus and, therefore, the possibility of these species be synonyms must be further examined in the future.