Relating to or involving the endosiphon, the internal tubing structure found in squid, octopuses, and related sea creatures.
From 'endosiphon' + the adjective suffix '-al'. The term combines the anatomical structure name with a suffix to describe anything pertaining to this internal system.
When octopuses hunt and hide, their endosiphonal system lets them squeeze through impossibly small spaces and change water flow instantly—this same system that helps them breathe is also crucial to their shape-shifting abilities that make them seem like aliens.
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