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Cnemidactis
Taxonomy
Cnemidactis was named by Spencer (1918) [Sepkoski's age data: O Ashg-m Sepkoski's reference number: 2,1066]. Its type is Urasterella girvanensis. It is the type genus of Cnemidactinidae.
It was assigned to Uractinida by Sepkoski (2002); to Urasterellinae by Dean Shackleton (2005); to Urasterellidae by Blake and Rozhnov (2007); and to Cnemidactinidae by Spencer (1918), Owen (1965), Spencer and Wright (1966), Blake and Guensburg (1993) and Blake (2018).
It was assigned to Uractinida by Sepkoski (2002); to Urasterellinae by Dean Shackleton (2005); to Urasterellidae by Blake and Rozhnov (2007); and to Cnemidactinidae by Spencer (1918), Owen (1965), Spencer and Wright (1966), Blake and Guensburg (1993) and Blake (2018).
Synonymy list
| Year | Name and author |
|---|---|
| 1918 | Cnemidactis Spencer p. 156 |
| 1965 | Cnemidactis Owen p. 564 |
| 1966 | Cnemidactis Spencer and Wright p. U71 |
| 1993 | Cnemidactis Blake and Guensburg p. 111 |
| 2002 | Cnemidactis Sepkoski |
| 2005 | Cnemidactis Dean Shackleton p. 97 |
| 2007 | Cnemidactis Blake and Rozhnov p. 524 |
| 2018 | Cnemidactis Blake p. 31 |
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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. †Cnemidactis Spencer 1918
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†Cnemidactis girvanensis Schuchert 1914
†Cnemidactis macroadambulacralatas Blake and Guensburg 1993
†Cnemidactis osloensis Hansen et al. 2005
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Dean Shackleton 2005 | Loss of highly calcified madreporite. |