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Plesiosaur tooth + Replica
Incertae sedis is a term used when it is uncertain in what part of the taxonomy an organism should be placed. The addition should only be used in taxonomic units higher than Genus. With uncertainty about placing a species in one genus, the following notation is used with a question: Favosites? basaltiformis. With uncertainty about the species itself the abbreviation sp. can be used: Favosites sp.
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