A strange 525 million-year-old fossil creature is baffling scientists because it does not fit neatly into any existing animal groups.The animal, from the early Cambrian Period, might have belonged to a now extinct mollusc-like phylum, academics from America and China say. Other researchers have suggested the creature could represent an early annelid or arthropod. Details are published in Proceedings of the Royal Society B. The 5-10cm-long (2-4 inch) fossil, from Anning in China, had a flattened body and horizontal fins which, researchers think, could have been used to support it as it moved along the sea floor. It also had...