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Browse Items (11 total)
- Collection: Fossils
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Echinoid
Taxonomy
Phylum: Echinodermata
Class: Echinoidea
Diagnostic features
Ambulacra (tube feet)
Periproct (opening for anus)
Peristome (opening for mouth)
Pentaradial symmetry (regular echinoids)
Bilateral symmetry imposed upon pentaradial symmetry…