Portalia mira is a fossil from the Burgess Shale that was originally described by Charles Walcott as a holothurian echinoderm. A later interpretation by F. Madsen in 1957 posits P. mira as a sponge.[1][2]

Temporal range: Burgess Shale
Portalia mira.jpg
Reconstruction as a holothurian-like organism
Scientific classification edit
Kingdom: Animalia
Phylum: incertae sedis
Genus: Portalia
P. mira
Binomial name
Portalia mira


  1. ^ MADSEN, F. J. 1957. On Walcott's supposed Cambrian holothurians. Journal of Paleontology, 31(1): 281-286.
  2. ^ Durham, J. W. (1974). "Systematic Position of Eldonia ludwigi Walcott". Journal of Paleontology. 48 (4): 750–755. JSTOR 1303225.

External linksEdit

  • "Portalia mira". Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011.