The oldest eugaleaspiform fishes from the Silurian red beds in Jiangxi, South China and their stratigraphic significance

•Two new species, Qingshuiaspis junqingi and Anjiaspis ericius, are established.•The eugaleapiforms-polybranchiaspiforms split occurred as early as early Telychian.•The Tangchiawu Formation can be correlated with the Qingshui Formation.•Eugaleapiformes provided key evidence for the correlation of Silurian LRBs in China.•The age of Shuyu should be modified as early Telychian, about 438 million years ago.