Relating to or located in both the head and tail regions of an organism.
From Greek 'kephale' (head) + 'kerkos' (tail) + '-al' (relating to). Describes anatomical features spanning from anterior to posterior regions.
Marine biologists use this term for mysterious ancient creatures and modern oddities where important features appear at both ends—imagine an organism designed by someone who wasn't sure which end should do what.
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