Late Ediacaran cavity-dwelling filamentous microorganisms accommodated in a valve-like organism from the uppermost Dengying Formation in eastern Yunnan of South China

• Cavity-dwelling filamentous microorganisms accommodated in a valve-like organism from the uppermost Dengying Formation (Ediacaran) eastern Yunnan are reported for first time. Well-preserved filaments develop mycelial networks with abundant branching pattern. Probable saprophytic interaction between and is discovered. The Ediacaran–Cambrian transition, one of major turning points Earth’s history, characterized by an epoch-making change biosphere. In South China, late Ediacaran (ca. 551–538 Ma) important stratigraphic unit yielding trace fossils, tubular skeletal fossils some complex forms that represent possible bilateral animals. fossil-bearing strata hitherto known Jiucheng Member containing Jiangchuan Biota, together enigmatic cosmopolitan taxon Shaanxilithes. Here, we present time cavity-dwelling within fossil upper Baiyanshao at Sujiawa Section Huize County, China. SEM scanning Micro-CT reconstruction indicate well-preserved were network structures Preservation might result decay process soft parts originally enclosed organism, subsequently preserved early diagenetic phosphatization, which obscures their original organic identity chemical composition. This paper potentially presents evidence relationship as decomposers prior to eve Cambrian Explosion metazoan