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Spirocrinus
Taxonomy
Spirocrinus was named by Mu and Wu (1974) [Sepkoski's age data: S Ldov-m Sepkoski's reference number: 651]. It is not extant.
It was assigned to Petalocrinidae by Mu and Wu (1974); and to Crinoidea by Sepkoski (2002).
It was assigned to Petalocrinidae by Mu and Wu (1974); and to Crinoidea by Sepkoski (2002).
Synonymy list
| Year | Name and author |
|---|---|
| 1974 | Spirocrinus Mu and Wu |
| 2002 | Spriocrinus 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. †Spirocrinus Mu and Wu 1974
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. T. Mu and Y. R. Wu 1974 | Horseshoe-shaped articular facets, fused brachials cylindrical and tapered
at both ends, as many as 10-12 distal ambulacra, adjacent arms not in lateral contact, ambulacral grooves spiraled around fused arm with left-hand spiral |