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Platyasterida (disused)
Taxonomy
Platyasterida was named by Spencer (1951). It is not extant.
It was considered an invalid subgroup of Asteroidea by Blake (2018).
It was assigned to Asteroidea by Lehmann (1957), Owen (1965), Spencer and Wright (1966); and to Asteroidea by Spencer (1951), Blake (1989), Blake (1994), Sepkoski (2002), Blake (2007), Blake and Rozhnov (2007).
It was considered an invalid subgroup of Asteroidea by Blake (2018).
It was assigned to Asteroidea by Lehmann (1957), Owen (1965), Spencer and Wright (1966); and to Asteroidea by Spencer (1951), Blake (1989), Blake (1994), Sepkoski (2002), Blake (2007), Blake and Rozhnov (2007).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1951 | Platyasterida Spencer p. 122 |
| 1957 | Platyasterida Lehmann p. 77 |
| 1965 | Platyasterida Owen p. 559 |
| 1966 | Platyasterida Spencer and Wright p. U42 |
| 1989 | Platyasterida Blake p. 212 |
| 1994 | Platyasterida Blake p. 125 |
| 2002 | Platyasterida Sepkoski |
| 2007 | Platyasterida Blake p. 1477 |
| 2007 | Platyasterida Blake and Rozhnov p. 521 |
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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.
Or. †Platyasterida Spencer 1951
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Invalid names: Eukrinasteridae Blake et al. 2007 [empty]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. K. Spencer 1951 | The adambulacralia and ambulacralia are almost in one plane and the adambulacralia fail to form a well-defined wall to th egroove. The oral surface of the arm is broad and flat. |