A type of branchia or gill found in certain crustaceans, attached at the joint of a limb.
From Greek 'arthron' (joint) + 'branchia' (gill). The direct Latin-Greek term for the jointed gill, more formally used in scientific taxonomy than the simplified 'arthrobranch'.
The '-ia' ending often signals the scientific name used in formal taxonomy—'arthrobranchia' is what you'd write in a research paper, while 'arthrobranch' is the casual version.
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