branchia

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branchia

[′braŋ·kē·ə]
(mechanics)
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Palps short; about same length as adjacent branchiate and densely ciliated on frontal surface one pair of thick, ciliated branchiae inserted just posterior to palps.
The species of terebellid polychaete shown above has enlarged, branched curlicues, or branchiae, that help it flourish in an oxygen-minimum zone 412 meters deep on the Pacific side of Costa Rica.