the duct joining the air bladder and alimentary canal of a physostomous fish.
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How to use pneumatic duct in a sentence
The absence of a pneumatic duct in the Physoclisti would appear to be due to a post-larval atrophy.The Works of Francis Maitland Balfour, Volume III (of 4) | Francis Maitland Balfour
In every modern Dipnoan, Crossopterygian, and Ganoid the air-bladder has an effective pneumatic duct.A Guide to the Study of Fishes, Volume 1 (of 2) | David Starr Jordan
He also believed that certain species produced a noise by forcing the gas from the air-bladder through a pneumatic duct.A Guide to the Study of Fishes, Volume 1 (of 2) | David Starr Jordan