In a manner relating to or affecting the external stomach region or abdominal surface.
The adverbial form of 'exogastric' (Greek 'exo-' outside + 'gastric' stomach), formed by adding '-ally' to describe how something occurs in relation to external stomach anatomy.
Scientists describing how certain mollusks develop exogastrically (with external stomach structures visible) helped reveal how embryonic development can produce wildly different adult body plans!
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