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(c. 60 ad)
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1 In corals, a rod-like structure that is formed from the swollen end of a septum. It may form a central structure within the skeleton.
2 In Gastropoda, a spiral, rod-like structure that is formed by the fusion of their inner surfaces in shells that are coiled very tightly around an axis.
A Dictionary of Zoology »
Earth Sciences and Geography — Zoology and Animal Sciences.
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