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The head is laterally compressed, with a curved dorsal profile and small eyes that are covered by a thin membrane. The mouth is terminal, with a three-lobed rigid structure consisting of a pair of smooth, hard, bulbous swellings along the lower lip and a medial spur that projects down and forward. The lower jaw is longer than deep, bearing two rows of conical teeth numbering 17 plus 4 replacements each. There are upper and lower pharyngeal tooth plates

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