taxonomical revision of ’Dongfangaspis qujingensis’from the Lower Devonian of Qujing, Yunnan Province

he affinity of ‘Dongfangaspis qujingensis’, initially assigned to Dongfangaspis&nbsp;but later to Laxaspis, has long been controversial. However, the taxonomical revision raises&nbsp;a new problem of junior homonym since the type species of Laxaspis is L. qujingensis. Here,&nbsp;we describe some new materials of ‘Dongfangaspis qujingensis’ and Damaspis vartus from&nbsp;the Xishancun Formation (early Lochkovian, Early Devonian) in Qujing, Yunnan Province.&nbsp;‘Dongfangaspis qujingensis’ strikingly resembles Damaspis vartus in the slightly longer&nbsp;headshield, bifurcated ends of the lateral transverse canals, unconnected V-shaped posterior&nbsp;supraorbital canals, and at least seven pairs of lateral transverse canals issuing from the lateral&nbsp;dorsal canal. These similarities indicate that ‘D. qujingensis’ is more suggestive of Damaspis than<br />Dongfangaspis and Laxaspis. Therefore, we propose to remove ‘Dongfangaspis qujingensis’ from&nbsp;Laxaspis to Damaspis. The new specimens of Damaspis vartus reveal five long lateral transverse<br />canals on the right side, corroborating that the asymmetric sensory canal system in the holotype is<br />the intraspecific variation.