The basal skeletal support or cartilage structure of a fin in fish; the main supporting element of a fin.
From Greek 'basis' (base) + 'pterygion' (fin). A technical ichthyological term for the foundational anatomy that supports and controls fish fin movement.
The basipterygium is like the 'hip bone' of a fish fin—without these skeletal supports, fish couldn't steer or control their swimming at all!
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