1) Burgess Shale animal 
Louisella is a genus of priapulid worm known from the Middle Cambrian Burgess Shale. It was originally described by Charles Walcott in 1911 as a holothurian enchinoderm,{Cite jstor|1303225}[/ref] and represents a senior synonym of Miskoia, which was originally described as an annelid. {gpb abundance|48|< 0.1} It has palaeoscolecid-like sclerites. ...