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Arthraster
Taxonomy
Arthraster was named by Forbes (1848) [Sepkoski's age data: K Turo K Maes Sepkoski's reference number: 1066]. Its type is Arthraster dixoni. It is the type genus of Arthrasterinae, Arthrasteridae. It was considered monophyletic by Villier (2010) and Gale (2020).
It was assigned to Arthrasterinae by Spencer (1918) and Spencer and Wright (1966); to Valvatida by Sepkoski (2002) and Villier (2010); and to Chaetasteridae by Gale (2020).
It was assigned to Arthrasterinae by Spencer (1918) and Spencer and Wright (1966); to Valvatida by Sepkoski (2002) and Villier (2010); and to Chaetasteridae by Gale (2020).
Species
Synonymy list
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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. †Arthraster Forbes 1848
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†Arthraster cristatus Spencer 1907
†Arthraster dixoni Forbes 1848
†Arthraster spenceri Mercier 1935
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A.S. Gale 2020 | Long-armed, robust chaetasterids, in which the extraxial arm is constructed of 7 rows of ossicles, including 1 row of large radials, paired rows of supero- and inferomarginals and broad actinals. Arm ossicles with tall transverse crest; abactinals of disc small, round, with raised central region. |