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Ristnacrinus
Taxonomy
Ristnacrinus was named by Opik (1934). Its type is Ristnacrinus marinus.
It was assigned to Eustenocrinidae by Donovan (1984) and Ausich (1998); to Disparida by Sepkoski (2002); and to Iocrinidae by Donovan (1985) and Ausich et al. (2015).
It was assigned to Eustenocrinidae by Donovan (1984) and Ausich (1998); to Disparida by Sepkoski (2002); and to Iocrinidae by Donovan (1985) and Ausich et al. (2015).
Species
R. marinus (type species), R. oepiki
Species lacking formal opinion data
Synonymy list
Year | Name and author |
---|---|
1934 | Ristnacrinus Opik |
1984 | Ristnacrinus Donovan |
1985 | Ristnacrinus Donovan |
1998 | Ristnacrinus Ausich p. 25 |
2002 | Ristnacrinus Sepkoski |
2015 | Ristnacrinus Ausich et al. |
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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. †Ristnacrinus Opik 1934
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†Ristnacrinus marinus Opik 1934
†Ristnacrinus oepiki Ausich et al. 2015
Diagnosis
No diagnoses are available