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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), Gale (2020).
It was assigned to Arthrasterinae by Spencer (1918), Spencer and Wright (1966); to Valvatida by Sepkoski (2002), Villier (2010); and to Chaetasteridae by Gale (2020).
It was assigned to Arthrasterinae by Spencer (1918), Spencer and Wright (1966); to Valvatida by Sepkoski (2002), 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. |
Measurements
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| Source: g = genus, c = class, p = phylum | |||||
| References: Villier 2010, Aberhan et al. 2004, Aberhan 1992 | |||||
Age range: base of the Late/Upper Bathonian to the top of the Late/Upper Santonian or 168.20000 to 83.60000 Ma
Collections (11 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Bathonian | France | A. spenceri (72284) | |
| Early/Lower Cenomanian | France | A. cristatus (59613) A. dixoni (59619) | |
| Late/Upper Cenomanian | France | A. cristatus (59585) | |
| Early/Lower Turonian | Czechia | A. cristatus (90516 90518) | |
| Coniacian | France | A. sp. (59680) | |
| Late/Upper Coniacian - Early/Lower Santonian | France | A. cristatus (59675) A. dixoni (59612 59659) | |
| Middle Santonian - Late/Upper Santonian | France | A. cristatus (59652) |