Here's another interesting and rather odd early echinoderm. Helicoplacoids appear only in
the early Cambrian shales. It appears to have had a variable shape.
Most fossils found have it twisted into a helical shape (hence the name), but there is evidence
it could extend and straighten out, at least to a certain extent. It may have been a
free-floating organism, however many believe one end was burrowed into the sand or attached to a
About the specimen
It is a Helicoplacus gilberti from the Poleta formation, Cambrian, California.