bicellum brasieri bicellum brasieri bicellum brasieri is a fossil holozoan. it is about 1 billion years old and could be the oldest example of complex multicellularity in the evolutionary lineage leading to the animals. it was discovered in 2021, and is named posthumously after the late palaeontologist martin brasier, who was a co-author of the paper that first described it. bicellum brasieritemporal range: multiple specimens of b. brasieri, such as the holotype (a) scientific classification domain: eukaryota clade: amorphea clade: obazoa (unranked): opisthokonta (unranked): holozoa genus: †bicellum species: †b. brasieri binomial name †bicellum brasieristrother et al. 2021 fossil site bicellum was found in sediments from the diabaig formation in loch torridon, scotland. the diabaig formation, considered to represent an ancient lake deposit, was already known to preserve the first non-marine eukaryotes.