|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Gastropoda - Orthonematidae
It was assigned to Turritellidae by Knight et al. (1960); to Acanthonematinae by Nützel (1998); to Orthonemidae by Nützel and Bandel (2000); to Neotaenioglossa by Sepkoski (2002); to Orthonematinae by Bouchet et al. (2005); and to Orthonematidae by Nützel and Ketwetsuriya (2016).
|Year||Name and author|
|1862||Orthonema Meek and Worthen|
|1960||Orthonema Knight et al. p. 317|
|1975||Geolcomia Licharev p. 115|
|2000||Orthonema Nützel and Bandel|
|2002||Geolcomia Sepkoski, Jr.|
|2002||Orthonema Sepkoski, Jr.|
|2005||Orthonema Bouchet et al. pp. 121, 247|
|2016||Orthonema Nützel and Ketwetsuriya p. 505|
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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.