Another term for an entrochite, or a genus of extinct crinoid animals that lived on ancient ocean floors.
From Greek 'entron' (within) and 'ochos' (holder/vessel), literally 'that which contains within.' This scientific name was applied to fossil remains recognized as parts of ancient crinoid creatures during early fossil classification systems.
Entrochus stems from the same root family as 'entrophy'—and scientists once couldn't tell if these fossils were plant or animal, only realizing centuries later they were creatures with tentacle-like arms!
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