Placidus leucomaculatus Li & Zhang, 2006: 156.
Minucella leucomaculata ( Li & Zhang, 2006), a new combination, by Wei, Zhang & Webb, 2008: 37.
Placidus maculates Li & Zhang, 2007: 149 (in Li et al, 2007), synonymised by Wei, Zhang & Webb, 2008: 37.
Placidus albonatatus Li & Wang, 2006 (in Li & Jin, 2006: 179). syn. nov.
Notes. Wei, Webb & Zhang (2008) reviewed the genera Cyrta and Placidus, and considered the genus Cyrta as a senior synonym of Placidus, but they not listed the species Placidus albonatatus Li & Wang, 2006. After examination of the holotype specimen of Placidus albonatatus, we recognize the species Placidus albonatatus Li & Wang, 2006 (published in April, 2006) as a junior synonym of Minucella leucomaculata ( Li & Zhang, 2006) ( Placidus leucomaculatus Li & Zhang published in January, 2006).