Hi Graham  Thanks for your efforts on this  Your text is so much better than what was there before  I originally intended to tackle the page myself but its really not my area and Id probably have wound up just tweaking what was already there  It was something of a relief when I saw that youd already written an alternative on the talk page  Anyway Ive just had a go tweaking the paragraphing of the text and wikilinking you know the hard bits  Ill have a read through at some point and see if I can expand it anywhere unlikely  One thing I note the page could do with is some figures  There are a few animals linked in the article but only ones like Hallucigenia have anything approaching an image we could use here  If youve any appropriate images yourself especially if theyve been used in papers that could be cited I think theyd help illustrate the topic  Cheers