|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Gastropoda - Cephalaspidea - Retusidae
It was reranked as Retusa (Cylichnina) by Martin (1904), Glibert (1962), Palmer and Brann (1966) and Mandic and Steininger (2003).
It was assigned to Cephalaspida by Sepkoski (2002); to Retusidae by Todd (2001) and Harzhauser and Kowalke (2002); and to Retusa by Martin (1904), Glibert (1962), Palmer and Brann (1966) and Mandic and Steininger (2003).
|Year||Name and author|
|1904||Retusa (Cylichnina) Martin p. 135|
|1962||Retusa (Cylichnina) Glibert p. 57|
|1966||Retusa (Cylichnina) Palmer and Brann p. 878|
|2002||Cylichnina Harzhauser and Kowalke p. 74|
|2002||Cylichnina Sepkoski, Jr.|
|2003||Retusa (Cylichnina) Mandic and Steininger p. 274|
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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.