Euseius yousefi (El-Borolossy)

Abo-Shnaf, Reham I. A. & De, Gilberto J., 2014, Phytoseiid mites (Acari: Phytoseiidae) from Egypt, with new records, descriptions of new species, and a key to species, Zootaxa 3865 (1), pp. 1-71 : 19-21

Euseius yousefi (El-Borolossy)

( Figs 27–33 )

Amblyseius yousefi El-Borolossy , in Nasr & Abou-Awad, 1985: 246; Zaher, 1986: 107. Euseius yousefi .— Moraes et al., 2004: 86.

Female (holotype and one paratype female and one additional female).

Dorsal shield mostly smooth, with few anterolateral striae; 356 [360, 374] long; 239 [217, 244] wide ( Fig. 27 ), with 17 pairs of setae, six pairs of pores and eight pairs of lyrifissures. Setae j1 42 [43, 44], j3 49 [55], j4 42 [42], j5 49 [46, 49], j6 73 [62, 62], J2 75 [72, 73], J5 5 [6, 5], z2 39 [45, 44], z4 68 [70, 73], z5 23 [21], Z1 42 [44, 47], Z4 75 [66, 68], Z5 86 [77, 78], s4 96 [91, 96], S2 78 [75, 78], S4 55 [51, 57], S5 57 [52, 60], r3 39 [40, 42], R1 26 [24, 29]. Dorsal setae smooth, except Z5, serrate. Peritreme extending forward to level between j1 and j3.

Venter ( Fig. 28 ). Sternal shield smooth, with three pairs of setae and two pairs of lyrifissures, posterior margin indistinct; st4 on metasternal shield. Distances between st1–st1 69 [68, 62], st2–st2 75 [76, 88], st3–st3 87 [100, 94], st4–st4 90 [109]. Genital shield smooth; distance between st5–st5 88 [95, 88]. Ventrianal shield vase-shaped, smooth; 114 [116, 114] long, 65 [64, 65] wide at ZV2 level and 78 [82, 86] wide at level of anus; with three pairs of pre-anal setae and a pair of pre-anal pores posteromesad of JV2. Seta JV5 60 [65, 62]. Ventral setae smooth. Two pairs of metapodal plates.

Spermatheca ( Fig. 30 ). Calyx of spermatheca trumpet-shaped 10 [9, 10] long; atrium small.

Gnathosoma. Corniculi parallel to each other, adjacent to internal malae. Movable cheliceral digit 26 [27, 26] long, with 1 [1] tooth; fixed digit 26 [28, 26] long, with 5 [5] teeth; dorsal and lateral lyrifissures distinct ( Fig. 29 ).

Legs. Macrosetae blunt or with distal knob: Sge II 31 [31 34], Sge III 42 [41, 42], Sge IV 62 [65, 62], Sti IV 42 [45, 44], St IV 81 [81, 83] ( Fig. 31 ); chaetotaxy of genu II 2, 2/0, 2/0, 1; genu III 1, 2/0, 2/1, 1.

Male (one paratype).

Dorsal shield pattern as in female; 286 long and 194 wide. Setae j1, j5, j6, J2, z2, z4, z5, Z1, Z4, s4, S2, r3 and R1 (broken); j3 41, j4 28, J5 4, Z5 54, S4 33, S5 36. Dorsal setae smooth, except Z5, serrate. Peritreme extending forward to level between z2 and z4.

Venter. Distances between st1–st1 57, st2–st2 62, st3–st3 68, st4–st4 52, st5–st5 50. Ventrianal shield subtriangular, with transverse striae in the anterior two thirds ( Fig. 33 ); 108 long and 169 wide at anterior corners; with three pairs of pre-anal setae, a pair of pre-anal pores and two pairs of lyrifissures. Seta JV5 42.

Gnathosoma. Movable cheliceral digit 19 long, apparently with one tooth; fixed digit 21 long, apparently with two teeth; dorsal and lateral lyrifissures distinct. Shaft of spermatodactyl 26 long ( Fig. 32 ).

Legs. Macrosetae blunt or with distal knob: Sge II 29, Sge III 31, Sge IV 45, Sti IV 38, St IV 50; chaetotaxy of genua II and III as in female.

Specimens examined. Holotype female, one paratype female and one paratype male from Zizyphus sp. leaves, at Sohag governorate, December 1978 (coll. M.A. El-Borolossy); one female from Ficus sycomorus L. ( Moraceae ), at Aswan governorate, November 1980 (coll. M.A. Zaher).

Previous records from Egypt. Sohag governorate ( Zaher, 1986); unspecified governorate (Nasr & Abou- Awad, 1985).

Remarks. According to Nasr & Abou-Awad (1985), A. yousefi was first described in an unpublished MSc thesis ( El-Borolossy, 1979). Nasr & Abou-Awad (1985) mentioned the name of this species (indicating El- Borolossy [sic] as the author) in a key to the Egyptian Amblyseius . That constitutes the original description of the species, despite the fact that no information was then provided about the type specimens. Zaher (1986) provided a detailed redescription of the species, with illustrations and setal measurements, mistakenly mentioning Zaher & El- Brollosy [sic] as the authors. Our measurements of the holotype are close to those reported by Zaher (1986) for a single female, except z2 (37 according to that author).

Figures

FIGURES 27 – 33. Euseius yousefi: 27. Female dorsal shield; 28. Female ventral shields; 29. Female chelicera; 30. Spermatheca; 31. Genu, tibia and basitarsus of female leg IV; 32. Spermatodactyl; 33. Male ventrianal shield.