|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was reranked as Hyolithus (Orthotheca) by Holm (1893); it was reranked as Hyolithes (Orthotheca) by Cowper Reed (1909) and Resser and Endo (1937).
It was assigned to Hyolithus by Holm (1893); to Hyolithes by Cowper Reed (1909) and Resser and Endo (1937); to Hyolithidae by Henningsmoen (1952); to Orthothecidae by Fisher (1962) and Malinky (1990); and to Orthothecida by Sepkoski (2002) and Malinky (2003).
|Year||Name and author|
|1893||Hyolithus (Orthotheca) Holm|
|1909||Hyolithes (Orthotheca) Cowper Reed p. 211|
|1937||Hyolithes (Orthotheca) Resser and Endo|
|1962||Orthotheca Fisher p. 125|
|1990||Orthotheca Malinky p. 229|
|2002||Orthotheca Sepkoski, Jr.|
|2003||Orthotheca Malinky p. 641|
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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.