Yezonychus sapporensis Ehara

Beard, Jennifer & Walter, David Evans, 2010, New spider mite genus (Prostigmata: Tetranychidae) from Australia & New Zealand, with a discussion of Yezonychus Ehara, Zootaxa 2578, pp. 1-24 : 2

Yezonychus sapporensis Ehara

( Fig. 1 )

Material examined. Japan. 7 Ψ, 4 ɗ, deutonymph, protonymph, ex. leaves of Sasa senanensis (Franc. & Sav.) (Poaceae) , Sapporo, Hokkaido, 30.vii.2009, A. Chittenden (QM, all separate slides); 3 Ψ, 4 ɗ, Sapporo, 05.viii.2008, Y. Saito (QM, 4 slides).

Remarks. Empodia I–II of both sexes are almost identical, with the empodia of males being slightly smaller than those of the female. Number of setae on legs I–IV: female cx 2, 2, 1, 1; tr 1, 1, 1, 1; fe 9, 7, 3, 3; ge 4, 5, 2, 1; ti 8(1+0), 6, 6, 7; ta 16(2+3), 15(2+3), 11(1+0), 11(1+0); male cx 2, 2/1*, 1, 1; tr 1, 1, 1, 1; fe 9, 6/7*, 3, 3; ge 4, 5, 2, 1; ti 11(4+0), 6, 6, 6/7*; ta 17(4+3), 15(2+3), 10(1+0), 9*/10(1+0); deutonymph tr 1, 1, 1, 1; fe 9, 6, 3, 3; ge 4, 5, 2, 1; ti 8(1+0), 6, 6, 4/5; ta 16(2+3), 14(1+3), 11(1), 6; protonymph tr 0, 0, 0, 0; fe 3, 3, 2, 2; ge 4, 4, 2, 1; ti 6(1+0), 5, 5, 5; ta 13(2+3), 10(1+1), 8, 6 [* number setae listed by Ehara (1978)]. We did not examine any larvae, and Ehara (1978) did not provide any morphological details of the immatures. This species is pale yellowish-white to pale greenish-yellow in colour (pers. com. Saito), and females are red in winter ( Ehara 1978). Individuals live within woven silken nests.

Figures

FIGURE 1. Yezonychus sapporensis Ehara, A. female empodium I dorsal aspect, showing basal stalk (indicated by arrow); B. female empodium IV lateral aspect; C. male empodium II dorsal aspect, note basal stalk; D. male empodium I lateral aspect. Scale bar = 20 μm.