A group or category of fish having a particular gill structure (plural of glaniostomum).
From Greek 'glene' (socket, cavity) + Greek 'stoma' (mouth, opening). This zoological term describes fish classified by their distinctive gill and mouth characteristics.
This is a ghost term in taxonomy—it exists in old scientific texts but modern ichthyologists (fish scientists) have reorganized fish classification so thoroughly that terms like this are essentially museum pieces.
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