A type of gill in crustaceans that is attached to the joint or base of a leg.
From Greek 'arthron' (joint) + 'branchia' (gill). The term precisely describes the anatomical location where this respiratory organ connects to the crustacean's limb.
Crustaceans like crabs evolved super-efficient gills hidden in their shell because they positioned respiratory organs right at the joints of their legs—multitasking anatomy at its finest.
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