|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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