VERY HIGHLY ,nay,UNRESERVEDLY recommended,3,2 Mb
This is for all those who are interestested (almost said "this is dedicated to all those interested" in the earliest history of (multicellular) animals!!!!!!!!!!
in Earths earliest biota...
myanknollszieparamNaturellular_eukaryotes_from_the_.pdf
Give it a go, because Zhu and Knoll do know their paleobiology.
I would NOT be far wrong in saying that now that Martin Brasier is no longer with us, Knoll is one of the biggest names in "early earth/astrobiology".