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Tethyaster guerangeri
Taxonomy
Tethyaster guerangeri was named by Breton (1995). Its type specimen is Holotype and one paratype, Muséum of Le Mans and is a 3D body fossil. Its type locality is La Butte de Gazonfier, Le Mans (Sables et Grès du Mans), which is in a Cenomanian coastal claystone/sandstone in the Le Mans Formation of France.
Synonymy list
| Year | Name and author |
|---|---|
| 1995 | Tethyaster guerangeri Breton pp. 19-25 figs. figs 1-6, pl. 1-3 |
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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.
†Tethyaster guerangeri Breton 1995
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Breton 1995 | Disk large. Five arms relatively short, triangular with broad base. Interbrachial arc low, rounded. R/r ratio approximately equals to three. Abactinal plates present to the arm tip. Small, low paxillae with a crown of 10-15 dense, cylindrical granules. Madreporite of large size circular, located at about 3/5 interbrachial ray. Marginal plates numerous (35-40 pairs per half-arc), opposite. Superomarginal plates short, high. Profile convex, triangular. Ornament of dense granules. Inferomarginal high, short, relatively broad. Profile highly convex. Tubercles larger in the median axis of the external face, bear flattened spines. Actinal plates in transverse and longitudinal rows present to two-third of the arm length. Adambulacral short, curved. Adambulacral spines compressed, flat. Oral projected. Fascioles deep, extending from marginals to the adambulacrals, some diverging within the actinolaterals. In marginals, fascioles slits with short spines, changed into granules internally. Ambulacral plates large, robust. Terminal plate short, heart-shaped. Surface with rounded granules. |
Measurements
No measurements are available
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| Source: f = family, c = class, p = phylum | |||||
| References: Aberhan et al. 2004, Blake 1990, Aberhan 1992 | |||||
Age range: Middle Cenomanian or 99.60000 to 93.50000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Cenomanian | France | Tethyaster guerangeri (type locality: 59791) |