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During the larval stage, the mollusc's shell sac secretes layers of calcium carbonate that build its protective shell.
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During the larval stage, the mollusc's shell sac secretes layers of calcium carbonate that build its protective shell.
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Related words
shell sac
Noun
Japanese Meaning
(動物学) 軟体動物が発生の過程で分泌する殻を形成する嚢。 / (特に現在) 頭足類において、ペンまたはグラディウス（内部分泌物）の分泌に関与するマントルのひだ。
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