What defines the unique shell composition of the scaly-foot gastropod?
Answer
Iron sulfides
The shell of the scaly-foot gastropod, Chrysomallon squamiferum, is distinctly different from the vast majority of mollusks. While most mollusks build their shells out of calcium carbonate, this species utilizes iron-sulfur compounds. Specifically, the shell consists of three layers, with the outer layer armored with iron sulfides like pyrite and marcasite. This material is derived from the environment through a rare biological process known as iron-based biomineralization, allowing the snail to construct an incredibly durable, metallic-like protective layer that thrives under the specific chemical conditions found near deep-sea hydrothermal vents.
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