In cephalopods like squid and octopuses, an internal tube-like structure that helps with respiration and water circulation.
From Greek 'endo-' (inside) + 'siphon' (tube). The term describes anatomical tubing within these sea creatures, combining ancient anatomy terminology with the concept of internal flow.
Cephalopods are so alien-like that their internal plumbing is completely different from fish or mammals—they have endosiphons instead of gills, which helped them become some of the ocean's most intelligent and adaptable creatures despite being so evolutionarily distant from us.
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