Portalia mira is a fossil from the Burgess Shale that was originally described by Charles Walcott as a holothurian echinoderm. A later interpretation by Madsen posits P. mira as a sponge. == References== ... Found on http://en.wikipedia.org/wiki/Portalia
1) Burgess Shale animal 
Portalia mira is a fossil from the Burgess Shale that was originally described by Charles Walcott as a holothurian echinoderm. A later interpretation by Madsen posits P. mira as a sponge. == References== ...