Humans, meet the ancient sea creature at the other end of your family tree
See the original posting on LA Times Science
A tiny wrinkled sack with a big mouth and no anus may well be the earliest-known of humans forebears. Meet Saccorhytus coronarius, a 540-million-year-old critter the size of a grain of sand, whose fossil remains were discovered in China.
Scientists say Saccorhytus is the most primitive of the…