Definitionn. respiratory organ of aquatic animals that breathe oxygen dissolved in water
Last update: October 18, 2015
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The heart is usually posterior to the branchia (proso-branchiate). [Please select]
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The two apertures lie just above the edge of the fold of membrane which runs from the inner root of the larger or outer branchia, across the branchial cavity and beneath the rectum, to the other side. [Please select]
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There are also two similar, but smaller, slits, contiguous to one another, near the root of the posterior branchia on each side, which lead to and may admit sea-water into the compartments containing the posterior cluster of the venous follicles. [Please select]
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Animal fluviatile, branchiated, viviparous; rostrum very short; eyes placed at the external base of two pointed tentacula; anterior border of the foot double; on each side the fore part of the body a small wing; that on the right side is folded into a channel, by which the water is introduced into the respiratory canal. [Please select]
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Excepting the faint clink of the _Tritonia arborescens_, repeated only once every minute or two, and apparently produced by the mouth armed with two dense horny laminæ, I am not aware of any sounds produced in the sea by branchiated invertebrata. [Please select]
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