nomen dubium
noun
no·men du·bi·um
ˈnō-mən-ˈdü-bē-əm
-ˈdyü-
plural nomina dubia
ˈnä-mə-nə-ˈdü-bē-ə
-ˈdyü-,
ˈnō-
: a taxonomic name that cannot be assigned with certainty to any taxonomic group because the description is insufficient for identification and the original specimens no longer exist
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Merriam-Webster unabridged
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