A member of an extinct group of early amphibians that retained fish-like gills into adulthood.
From Greek 'branchia' (gill) + 'sauros' (lizard/reptile). Paleontologists created this term for amphibian-like creatures that never fully completed the transition to lungs.
Branchosaurs are like nature's unfinished experiments—they evolved legs and left water but kept their gills, living as awkward in-betweeners for millions of years before going extinct.
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