An organism, particularly certain mollusks or fish, that has gills or respiratory structures positioned on or near the back.
From Latin 'dorsi-' (back) combined with 'branchia' (gills) from Greek 'branchia.' This term describes aquatic animals with dorsal gill placement rather than the typical side or ventral positioning.
Some ancient mollusks had gills on their backs like tiny fish fin-gills—this strange arrangement tells us about evolutionary experiments nature conducted millions of years ago!
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