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Hemiaster (Trachyaster)
Taxonomy
Trachyaster was named by Pomel (1869).
It was reranked as Hemiaster (Trachyaster) by Fischer (1966) and Kier (1984).
It was assigned to Spatangoida by Pomel (1883); and to Hemiaster by Fischer (1966) and Kier (1984).
It was reranked as Hemiaster (Trachyaster) by Fischer (1966) and Kier (1984).
It was assigned to Spatangoida by Pomel (1883); and to Hemiaster by Fischer (1966) and Kier (1984).
Subtaxa
Species lacking formal opinion data
Synonyms
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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.
Subg. †Hemiaster (Trachyaster) Pomel 1869
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†Hemiaster (Trachyaster) decipiens Duncan and Sladen 1883
†Hemiaster (Trachyaster) herrarae Lambert and Sanchez Roig 1926
Invalid names: Hemiaster (Trachyaster) minutus Sanchez Roig 1949 [nomen nudum]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Aberhan 1992, Kiessling 2004 | |||||
Age range: base of the Lutetian to the top of the Burdigalian or 47.80000 to 15.97000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lutetian | Qatar | Hemiaster decipiens (209101) | |
| Burdigalian | Egypt | Trachyaster cotteaui (47996) |