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New data from BESIII and LHCb show the existence of resonances withstrangeness filling multiplets of the broken SU(3)_f symmetry, with the patternpredicted by the quark model. This is the case of the newly discovered Z_{cs}(3985) and Z_{cs}(4003), which have a natural accommodation in the tetraquarkpicture, as shown in this note. The quasi-degeneracy between Z_{cs} (3985) andZ_{cs}(4003) reproduces, in the strange sector, the situation observed withX(3872) and Z_c(3900). This represents a significative score in favor of thetetraquark scheme.

The new resonances Z_{cs}(3985) and Z_{cs}(4003) (almost) fill two tetraquark nonets of broken SU(3)_f