https://echinoblog.blogspot.com/2012/05/anal-cones-diadematid-sea-urchin.html
The Echinoblog: ANAL CONES! Diadematid sea urchin mysteries!
Echinothrix from Lembeh Strait Photo (above) by Efdixon Another day when pictures say more than words! What is an anal cone??? The ...
sea urchinanalconesmysteries