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Sphaeriaster jurassicus
Taxonomy
Sphaeriaster jurassicus was named by Hess (1972). It is not extant. Its type specimen is Naturhistorisches Museum Basel, collection of H. Hess, holotype A139. Its type locality is Echinoderms, Oberer Hauptrogenstein, Late Bajocian, Schinznach, Aargau, which is in a Bajocian open shallow subtidal grainstone/marl in Switzerland.
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.
†Sphaeriaster jurassicus Hess 1972
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H Hess 1972 | Aboral side with rudimentary skeleton restricted to the center of the disc. Marginals and actinolateral plates lacking. Actinolateral field and most of the dorsal side covered by thick tegument. Adambulacral spines acicular. |
Measurements
No measurements are available
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| Source: c = class, p = phylum | |||||
| References: Aberhan 1992, Aberhan et al. 2004 | |||||
Age range: Late/Upper Bajocian or 171.60000 to 167.70000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Bajocian | Switzerland | Sphaeriaster jurassicus (type locality: 32036) |