What specific purpose does the enlarged ctenidium serve for the volcano snail?
Answer
It facilitates oxygen exchange in low-oxygen vent fluids
The ctenidium, or gill, occupies a large portion of the snail's body volume, specifically around 15.5 percent. Its primary function is to maximize the intake of oxygen, which is often limited in deep-sea vent environments. This high-capacity respiratory system is vital for sustaining both the snail's metabolism and the metabolic processes of the symbiotic bacteria housed in the esophageal gland.
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