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Helmersenia
Taxonomy
Helmersenia was named by Pander (1861). It is not extant.
It was assigned to Acanthamboniinae by Popov and Nolvak (1987) and Holmer (1989); to Siphonotretidae by Williams et al. (2000); and to Acrotretida by Sepkoski (2002).
It was assigned to Acanthamboniinae by Popov and Nolvak (1987) and Holmer (1989); to Siphonotretidae by Williams et al. (2000); and to Acrotretida by Sepkoski (2002).
Synonymy list
| Year | Name and author |
|---|---|
| 1861 | Helmersenia Pander |
| 1987 | Helmersenia Popov and Nolvak |
| 1989 | Helmersenia Holmer |
| 2000 | Helmersenia Williams et al. p. 143 |
| 2002 | Helmersenia Sepkoski |
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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.
G. †Helmersenia Pander 1861
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Diagnosis
No diagnoses are available