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Cenomanaster cenomanensis
Taxonomy
Asterias cenomanensis was named by Guéranger (1853) [The original material was destroyed during the Second World War]. It is the type species of Cenomanaster. It was considered monophyletic by Breton (1992).
It was recombined as Jacobella cenomanensis by Mercier (1935), Bigot (1945) and Mercier (1952); it was recombined as Cenomanaster cenomanensis by Wright (1951), Spencer and Wright (1966) and Breton (1992).
It was recombined as Jacobella cenomanensis by Mercier (1935), Bigot (1945) and Mercier (1952); it was recombined as Cenomanaster cenomanensis by Wright (1951), Spencer and Wright (1966) and Breton (1992).
Synonymy list
| Year | Name and author |
|---|---|
| 1853 | Asterias cenomanensis Guéranger p. 40 |
| 1886 | Asterias cenomanensis Guillier p. 257 |
| 1935 | Jacobella cenomanensis Mercier pp. 26-27 figs. pl. 3 fig. 2a-b |
| 1945 | Jacobella cenomanensis Bigot p. 17 |
| 1951 | Cenomanaster cenomanensis Wright p. 283 |
| 1952 | Jacobella cenomanensis Mercier p. 81 |
| 1966 | Cenomanaster cenomanensis Spencer and Wright p. U59 fig. 56.4 |
| 1992 | Cenomanaster cenomanensis Breton pp. 201-211 figs. 87-95, pl. 20 fig. 2-3, pl. 21-22 |
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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.
†Cenomanaster cenomanensis Guéranger 1853
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Breton 1992 | Disc large. Arms long with sharp tip. Interradial arc concave. Approximately 20 pairs of marginals per half-arm. Marginals generally opposite, sometime alternating. Abactinal reach near the tip of the arm. Abactinals irregular in size and shape, polygonal or rounded, moderately high, bearing granules and a large hemispherical granule on the largest plates. Superomarginals tall, curved, with a triangular profile. External face with an ornament of small, dense granules attached on granule-pits, and one (less frequently zero, two or more) very large hemispherical granule. Inferomarginals larger than superomarginals, with a convex profile and a domed external face. Ornament of fine dense granules attached to granule-pits. Actinolateral plates are polygonal with an ornament of fine dense granules and they reach the half of the arm length. Adambulacrals short, squared with 2-3 short, robust but flattened adambulacral spines. Pedicellariae-pits elongate, relatively small. Pedicellariae are bivalve, alveolar. |