|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Bivalvia - Protobranchia
It was reranked as the subclass Protobranchia by Purchon (1987), Salvini-Plawen and Steiner (1996), Reid (1998), Bieler and Mikkelsen (2006) and Carter et al. (2011); it was considered an invalid subgroup of Bivalvia by Giribet and Wheeler (2002); it was reranked as the unranked clade Protobranchia by Mikkelsen and Bieler (2008); it was reranked as the superorder Protobranchia by Nevesskaja (2009).
It was assigned to Eubivalvia by Carter et al. (2011); and to Bivalvia by Ridewood (1903), Pelseneer (1906), Pelseneer (1911), Purchon (1987), Salvini-Plawen and Steiner (1996), Reid (1998), Bieler and Mikkelsen (2006), Mikkelsen and Bieler (2008), Nevesskaja (2009) and Coan and Valentich-Scott (2012).
|Year||Name and author|
|1996||Protobranchia Salvini-Plawen and Steiner|
|2006||Protobranchia Bieler and Mikkelsen p. 228|
|2008||Protobranchia Mikkelsen and Bieler p. 19|
|2011||Protobranchia Carter et al. p. 5|
|2012||Protobranchia Coan and Valentich-Scott p. 32|
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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.