A covering or sheath encasing the head or head-region of certain organisms, particularly used in zoology and parasitology.
From Greek kephalē (head) + thēkē (case/sheath). This anatomical term was created to describe protective coverings around the head in various animals, particularly parasitic worms.
Parasites are bizarre evolutionary engineers—some developed head-sheaths as protective coverings, and scientists had to name these structures, creating wonderfully specific terms like 'cephalotheca' for structures most people never knew existed.
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