Having a head or head-like structure on only one side, or having an incomplete head.
From Greek 'hemi-' (half) + 'kephale' (head) + '-ous' (characterized by). This rare anatomical term describes asymmetry in head structure or development.
Hemicephalous conditions in marine creatures like flatfish show nature's incredible flexibility—their heads can develop asymmetrically in ways that would be catastrophic for mammals but work perfectly for their lifestyle!
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