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Tylasteria

Asteroidea - Valvatida - Goniasteridae

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).

Synonyms
Synonymy list
YearName and author
1913Tylaster Spencer
1929Tylasteria Valette
1966Tylasteria Spencer and Wright p. U63
1972Tylasteria Hess p. 14
1992Tylasteria Breton pp. 250-251
2002Tylasteria Sepkoski, Jr.
2011Tylasteria Gale p. 59

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
subphylumAsterozoa
RankNameAuthor
classAsteroidea
subclassAmbuloasteroidea
infraclassNeoasteroidea()
superorderValvatacea
orderValvatida
familyGoniasteridae
genusTylasteria

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.

Diagnosis
ReferenceDiagnosis
G. Breton 1992Form 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.