right|thumb The archenteron, also called the gastrocoel, is the internal cavity formed in the gastrulation stage in early embryonic development that becomes the cavity of the primitive gut.
right|thumb The archenteron, also called the gastrocoel, is the internal cavity formed in the gastrulation stage in early embryonic development that becomes the cavity of the primitive gut.
==Formation in sea urchins==
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).