A team of paleontologists has discovered several early Cambrian (535 million years old) fossils of kinorhynch worms, including the new species Eokinorhynchus rarus and two unnamed but related forms. SEM images of Eokinorhynchus rarus. Abbreviations: A1-A20 – 1st to 20th trunk annulus; an – anus; cs – caudal spine; hsc – head scalid; ls – large sclerite; 1ls-5ls – 1st to 5th pair of large sclerites; mg – midgut;...