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Mediaster
Taxonomy
Mediaster was named by Stimpson (1857) [Sepkoski's age data: K Camp-u R]. It is extant.
It was assigned to Goniasteridae by Spencer and Wright (1966) and Clark and Downey (1992); and to Valvatida by Sepkoski (2002).
It was assigned to Goniasteridae by Spencer and Wright (1966) and Clark and Downey (1992); and to Valvatida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1857 | Mediaster Stimpson |
| 1966 | Mediaster Spencer and Wright p. 62 |
| 1992 | Mediaster Clark and Downey p. 251 |
| 2002 | Mediaster 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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. M. Clark and M.E. Downey 1992 | A genus of Goniasteridae with internal radiating ossicles connecting bases of tabulate abactinal plates; abactinals not bare in centre, bordering granules or spinelets in single row; no secondary abactinals; interradial margins arcuate; marginal plates corresponding, forming definite border not higher than abactinal surface; adambulacral furrow margin straight. |