What term refers to a unilineal descent group whose members claim, but cannot demonstrate, common descent from an apical ancestor?

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Quizplus · Accepted Answer

A clan is a unilineal descent group in which members claim a common ancestor, but cannot always trace their actual lineage through genealogical records or documentation. This is in contrast to a lineage, where members can document their direct descent from a common ancestor.

What Term Refers to a Unilineal Descent Group Whose Members