最終更新日：2024/08/04

The initial part of a spiral shell, originating from a central chamber, in ammonoid molluscs

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ammonitella

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ammonitella

noun

The initial part of a spiral shell, originating from a central chamber, in ammonoid molluscs

The ammonitella is the initial part of a spiral shell.

意味（1）

The initial part of a spiral shell, originating from a central chamber, in ammonoid molluscs

The embryonic stage, consisting of a small ellipsoid protoconch and ammonitella, ends at about 0.6 mm.