Worms on 512m-years-old shellfish are ‘earliest parasites’
Prehistoric worms found attached to primitive filter-feeding shellfish that lived 512 million years ago are the ‘earliest known parasites’ on Earth, a study reported. The worms and their unwitting host appeared soon after the so-called ‘Cambrian explosion’ — when all major animal groupings appear in the fossil record. The fossil shellfish — a brachiopod, which … Read more