Wiwaxia was bilaterally symmetrical. It appeared as a featureless blob with two rows of spines down its "back". Fossils suggest it grew from 2 to 5 centimeters long, but its height remains uncertain.
Although fragments of Wiwaxia had been found as early as 1899, Charles Walcott described it fully from the Burgess Shale in 1911 as a type of worm. Its exact classification remains uncertain.
- ↑ Conway Morris, S. (1985). "The Middle Cambrian metazoan Wiwaxia corrugata (Matthew) from the Burgess Shale and Ogygopsis Shale, British Columbia, Canada". Philosophical Transactions of the Royal Society of London B 307 (1134): 507–582. Bibcode 1985RSPTB.307..507M. doi:10.1098/rstb.1985.0005. JSTOR 2396338. edit
- ↑ Walcott, C.D. (1911). "Middle Cambrian annelids. Cambrian geology and paleontology, II". Smithsonian Miscellaneous Collections 57: 109–144