|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
It was reranked as the order Heterostraci by Bryant (1932), Jordan (1963), Elliot and Loeffler (1989), Dineley and Metcalf (1999) and Elliott and Swift (2010).
It was assigned to Ostracophori by Jordan (1963); to Agnatha by Loeffler and Dineley (1976); to Diplorhina by Ritchie and Gilbert-Tomlinson (1977); to Chordata by Elliot and Loeffler (1989); to Pteraspidomorphi by Bryant (1932) and Dineley and Metcalf (1999); and to Pteraspidomorphi by Blieck et al. (2002), Elliott and Swift (2010) and Long (2011).
|Year||Name and author|
|1932||Heterostraci Bryant p. 231|
|1963||Heterostraci Jordan p. 584|
|1976||Heterostraci Loeffler and Dineley p. 758|
|1977||Heterostraci Ritchie and Gilbert-Tomlinson p. 367|
|1989||Heterostraci Elliot and Loeffler p. 884|
|1999||Heterostraci Dineley and Metcalf p. 11|
|2002||Heterostraci Blieck et al. p. 811|
|2010||Heterostraci Elliott and Swift p. 1874|
|2011||Heterostraci Long p. 241|
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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.