|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Gastropoda - Opisthobranchia
It was reranked as the order Opisthobranchiata by Martin (1904); it was reranked as the order Opisthobranchia by Squires (1999) and Harzhauser (2007).
It was assigned to Euthyneura by Martin (1904); to Heterobranchia by Squires (1999); and to Gastropoda by Knight et al. (1960), Squires (1989), Beesley (1998), Sepkoski (2002) and Harzhauser (2007).
|Year||Name and author|
|1904||Opisthobranchiata Martin p. 131|
|1960||Opisthobranchia Knight et al. p. 321|
|1989||Opisthobranchia Squires p. 444|
|1998||Opisthobranchia Beesley p. 915|
|1999||Opisthobranchia Squires p. 22|
|2002||Opisthobranchia Sepkoski, Jr.|
|2007||Opisthobranchia Harzhauser p. 112|
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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.