Lymnaea tomentosa hamiltoni is an extinct subspecies of freshwater snail, an aquatic gastropod mollusc in the family Lymnaeidae, the pond snails.
This subspecies was endemic to New Zealand.Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 The shells of these snails were found in lake marls in the southern part of the South Island.
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