Euseius Wainstein

Moraes, G. J. De, Ueckermann, E. A., Oliveira, A. R. & Yaninek, J. S., 2001, Phytoseiid mites of the genus Euseius (Acari: Phytoseiidae) from Sub­Saharan Africa, Zootaxa 3, pp. 1-70 : 2

Euseius Wainstein

Amblyseius (Amblyseius) section Euseius Wainstein, 1962: 15

Amblyseius (Euseius), DeLeon, 1965: 125

Euseius, DeLeon, 1966: 86 ; Muma et al., 1970: 92; McMurtry, 1983: 257 Type species: Seiulus finlandicus Oudemans, 1915 , by original designation (Wainstein 1962).

A slight modification of the definition given by McMurtry (1983) is adopted in this paper, to comprise specimens treated in this paper that differ slightly from that definition, in relation to the length of peritreme and position of preanal setae: females with dorsal shield smooth, striate or reticulate, and with the following setae always present: j1, j3­j6, J2, J5, z2, z4, z5, Z4, Z5, s4, S2, S4, S5. Seta Z1 always present, except for Euseius papayana ( Van der Merwe 1965 ). Setae r3 and R1 present, usually on the lateral cuticle of the idiosoma or occasionally on the dorsal shield. Thus, female idiosomal setal pattern (Chant & Yoshida­Shaul 1989) for all species in the genus is 10A:9B/JV­3:ZV, except for E. papayana , whose setal pattern is 10A:8A/JV­3:ZV. Posterior margin of sternal shield with a median lobe which may be difficult to discern in weakly sclerotized specimens. Genital shield distinctly wider than ventrianal shield, which is usually vase­shaped and widest at level of anal opening. With three pairs of pre­anal setae (JV1, JV2, ZV2), usually arranged almost in a transverse row, with seta JV1 inserted usually well behind anterior margin of shield. Peritremes most often relatively short, ending behind level of seta j3. Cheliceral digits with inner margins concave in lateral view; fixed digit with 2­7 small to minute teeth, all on the distal portion; movable digit with 1­2 teeth. Macrosetae usually present on genu IV, tibia IV and tarsus IV, often also on genua II and III, and rarely on genu I.