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Chaetasterina
Taxonomy
Chaetasterina was named by Hess (1970) [Sepkoski's age data: K Haut-u]. It is not extant. Its type is Chaetasterina gracilis. It was considered monophyletic by Hess (1970) and Gale (2020).
It was assigned to Chaetasteridae by Hess (1970); to Valvatida by Sepkoski (2002); and to Asterinidae by Gale (2020).
It was assigned to Chaetasteridae by Hess (1970); to Valvatida by Sepkoski (2002); and to Asterinidae by Gale (2020).
Species
C. gracilis (type 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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H Hess 1970 | Arms rounded. Superomarginal only slightly recognizable by their larger size from the other aboral plates. Inferomarginal plates slightly smaller than the superomarginals. Aboral plates with a crown of small acicular spine. Marginal and plates of the oral face with an external face entirely covered by spinelets (no paxilla). Spines of the ambulacral groove only slightly larger than those of the other parts. Actinolateral plates extending far, close to the tip of the arm. Actinolateral, marginals and adambulacral plates arranged in transversal rows. Mouth angle plate small. No pedicellariae. | |
| A.S. Gale 2020 | Hyalothricinae in which the arms are short and strap-like and the abactinals are arranged in poorly defined transverse rows. |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum | |||||
| References: Blake 1990, Aberhan 1992, Aberhan et al. 2004 | |||||
Age range: Late/Upper Hauterivian or 136.40000 to 130.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Hauterivian | Switzerland (Neuchatel) | C. gracilis (31986) |