Cambrian Epoch 2 (~508 million years ago)
British Columbia, Canada
Burgess Shale
In Parker (1998), several specimens of Wiwaxia corrugata were investigated. Microscopic parallel grooves were identified on the surfaces of their sclerites; physically, these structures act as diffraction gratings identical to those responsible for structural iridescence in extant marine polychaetes.
Electron microscopy.
Reconstruction of the appearance of Wiwaxia corrugata.
Fossil specimen of Wiwaxia corrugata.
Size of Wiwaxia corrugata.