concave on both sides, as the bodies of the vertebrae of fishes.
Historical Examples

The vertebrae are amphicoelous, and are generally well ossified.
The Vertebrate Skeleton Sidney H. Reynolds

The end result is an amphicoelous or biconcave centrum in general appearance much like that of the Selachian.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3 Various

The vertebrae are amphicoelous or sometimes nearly flat, and the notochord sometimes persists to some extent.
The Vertebrate Skeleton Sidney H. Reynolds

The neck is long, the caudal vertebrae are amphicoelous, and from three to five vertebrae are fused together in the sacral region.
The Vertebrate Skeleton Sidney H. Reynolds

(of the vertebrae of most fishes and some amphibians) concave at the anterior and posterior ends


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