 As of 2016 there are no indisputable body fossils of phoronids.Researching the Lower Cambrian Chengjiang fossils, in 1997 Chen and Zhou interpreted "Iotuba chengjiangensis" as a phoronid since it had tentacles and a U-shaped gut, and in 2004 Chen interpreted "Eophoronis" as a phoronid.However, in 2006 Conway Morris regarded "Iotuba" and "Eophoronis" as synonyms for the same genus, which in his opinion looked like the priapulid "Louisella".