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A number of recent Requests for an Opinion have cited Rule 18c of the International Code of Nomenclature of Bacteria as the Rule governing setting a time limit on the search for a neotype strain. This Rule only governs what happens when a neotype is proposed and not what happens when the original type appears to have been lost and a neotype is not found. It is appropriate to emphasize this issue and to examine what other alternatives are available.
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Brian J. Tindall (2016) studied this question.
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