Glossary entry
a. In Polyplacophora, the beak or umbo of a valve.
b. In Gastropoda, the first-formed end of a shell
b. In Gastropoda, the first-formed end of a shell
Author: Jan Delsing
| See also |
|---|
| umbo (Malacology) |
| Other meanings |
|---|
| apex (Entomology) |
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