摘要:T. permutus nom. n. is proposed for preoccupied specific name,Trimerus lobatus Tomczykowa,1975,Silurian trilobite of Poland. The name Homalonotus lobatus introduced by Prouty (1923) for trilobite from Silurian of Maryland,appeared to be a junior synonym of Trimerus delphinocephalus Green,1832,as the name for juvenile stages.