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Tylasteria
Taxonomy
Tylasteria was named by Valette (1929) [Sepkoski's age data: J Bajo-u K Albi Sepkoski's reference number: 1066]. It is not extant.
It was assigned to Valvatida by Sepkoski (2002); and to Goniasteridae by Valette (1929), Spencer and Wright (1966), Hess (1972), Breton (1992), Gale (2011) and Gale (2011).
It was assigned to Valvatida by Sepkoski (2002); and to Goniasteridae by Valette (1929), Spencer and Wright (1966), Hess (1972), Breton (1992), Gale (2011) and Gale (2011).
Species
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.
G. †Tylasteria Valette 1929
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†Tylasteria aalensis Mercier 1935
†Tylasteria jurensis Goldfuss 1833
†Tylasteria luciensis Mercier 1935
†Tylasteria prisca Valette 1928
Invalid names: Tylaster Spencer 1913 [replaced]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Breton 1992 | Form robust, with a large disc and arm obtuse to slender, moderately wide at their base. Interbrachial arc rounded. Marginal plates numerous, wider than long, with a convex to angular profile, a convex external facecovered with large dense deeply impressed granule-pits that form a honeycomb surface and are sometime irregular in size. Abactinal plates relatively large, flattened, covered by hexagonal granule-pits. No pedicellariae-pits. |