sea cucumber anal teeth

[cmungall]

sea cucumbers have calcified papilla surrounding their anal canal. See #1210 on whether these should be classified under the pan-metazoan "tooth" class. A more rational grouping would be a calcified skeletal element of the terminal part of the digestive tract.

todo: read:
https://www.karger.com/Article/Pdf/142845

for a discussion of histology and homology of these

(we really need an echinoderm ontology @balhoff!)

[gouttegd]

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