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Hippasteria antiqua
Taxonomy
Hippasteria antiqua was named by Fell (1956). It is not extant. Its type specimen is at Canterbury Museum, Christchuch.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Hippasteria antiqua Fell pp. 11-12 figs. pl. 1 |
| 1966 | Hippasteria antiqua Spencer and Wright p. U58 |
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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.
†Hippasteria antiqua Fell 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. B. Fell 1956 | Large size: R=116 mm. R/r ratio approximately 2.3. Body stellate. Disk pentagonal, large. Interbrachial arc straight. Arms nearly parallel sided. One row of 17 well-differentiated circular, not contiguous, domed carinal plates reaches the arm tip. Other abactinal twice smaller. About 15 pairs of marginal plates per half-arc. Superomarginal longer than wide, domed, bearing a single robust conical spine |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum | |||||
| References: Aberhan 1992, Aberhan et al. 2004, Blake 1990 | |||||