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Chaetasteridae
Taxonomy
Chaetasteridae was named by Sladen (1889) [Named as "Chaetasterinae" and considered as a subfamily of Linckiidae (see Clark & Downey 1992)]. It is extant. It was considered monophyletic by Mah and Blake (2012), Gale (2020).
It was assigned to Granulosina by Spencer and Wright (1966); and to Valvatida by Blake (1987), Blake (1989), Mah and Blake (2012), Gale (2020).
It was assigned to Granulosina by Spencer and Wright (1966); and to Valvatida by Blake (1987), Blake (1989), Mah and Blake (2012), Gale (2020).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1889 | Chaetasteridae Sladen p. 398 |
| 1966 | Chaetasteridae Spencer and Wright p. U56 |
| 1987 | Chaetasteridae Blake p. 520 |
| 1989 | Chaetasteridae Blake p. 213 |
| 2012 | Chaetasteridae Mah and Blake p. 3 |
| 2020 | Chaetasteridae Gale |
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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.
Fm. Chaetasteridae Sladen 1889
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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 | Arms long, narrow, subcylindrical, disc small, interradii acutely angled. Arms constructed of 7 to 13 well defined rows of extraxial ossicles; abactinal, marginal and actinal ossicles of the arm of similar size, all carry raised central ridge. Abactinal ossicles of disc small, round to oval. |