shuiyousphaeridium shuiyousphaeridium shuiyousphaeridium is an extinct genus of acritarch discovered in 1993. dated to 1.8ga, it represents one of the earliest fossil eukaryote taxa. shuiyousphaeridiumtemporal range: scientific classification domain: eukaryota kingdom: incertae sedis (unranked): acritarcha genus: shuiyousphaeridiumyan, 1993 species s. macroreticulatum s. membraniferum