|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was reranked as the order Opisthobranchiata by Martin (1904); it was reranked as the order Opisthobranchia by Harzhauser (2007).
It was assigned to Euthyneura by Martin (1904); and to Gastropoda by Knight et al. (1960), Beesley (1998), Sepkoski (2002) and Harzhauser (2007).
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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.