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Spenceraster rugosus
Taxonomy
Nymphaster rugosus was named by Spencer (1907). It is not extant. Its type specimen is Museum of Natural History, London, holotype BNHM OR 57516.
It was recombined as Trachyaster rugosus by Spencer (1913); it was recombined as Spenceraster rugosus by Spencer and Wright (1966), Breton (1992), Néraudeau and Breton (1993), Lewis (1993).
It was recombined as Trachyaster rugosus by Spencer (1913); it was recombined as Spenceraster rugosus by Spencer and Wright (1966), Breton (1992), Néraudeau and Breton (1993), Lewis (1993).
Synonymy list
| Year | Name and author |
|---|---|
| 1907 | Nymphaster rugosus Spencer p. 94 figs. pl. 29, fig. 7, 16 |
| 1913 | Trachyaster rugosus Spencer p. 131 |
| 1966 | Spenceraster rugosus Spencer and Wright pp. U62-63 figs. fig. 57.1 |
| 1992 | Spenceraster rugosus Breton pp. 356-361 figs. fig. 147 |
| 1993 | Spenceraster rugosus Lewis p. 65 |
| 1993 | Spenceraster rugosus Néraudeau and Breton p. 116 fig. 15 |
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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.
†Spenceraster rugosus Spencer 1907
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Breton 1992 | Small size. Arms short, narrow. Interbrachial arc rounded. Marginals few, relatively low and long. Profile convex. Ornament of tubercles and occasional granule-pits can lack abradially or on margins of plates. Marginals more or less curved to parallel. Narrow step occasionally on lateral sides of the external face. Pedicellariae-pits of winged-type. |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum | |||||
| References: Aberhan 1992, Blake 1990, Aberhan et al. 2004 | |||||
Age range: Late/Upper Cenomanian or 100.50000 to 93.90000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Cenomanian | France | Spenceraster rugosus (59619) | |
| Early/Lower Cenomanian | France (Poitou-Charentes) | Spenceraster rugosus (73862) | |
| Early/Lower Cenomanian | France (Normandy) | Spenceraster rugosus (59658) | |
| Late/Upper Cenomanian | United Kingdom (England) | Trachyaster rugosus (4071) | |
| Late/Upper Cenomanian | France | Spenceraster rugosus (59808) |