|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Xiphosura - Sessilia - Scalpellidae
It was reranked as the order Polyplacophora by Martin (1904).
It was assigned to Amphineura by Martin (1904); to Mollusca by Barnes (1998), Wells and Houston (2001) and Sepkoski (2002); and to Serialia by Giribet et al. (2006).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.