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Tylasteria prisca

Asteroidea - Valvatida - Goniasteridae

Taxonomy
Tylaster priscus was named by Valette (1928). It is not extant. Its type specimen is Lectotypes at University of Burgundy and University Claude Bernard Lyon 1.

It was corrected as Tylaster priscum by Valette (1929) and Mercier (1935); it was recombined as Tylasteria prisca by Valette (1929) and Breton (1992).

Synonymy list
YearName and author
1928Tylaster priscus Valette pp. 62-64 figs. fig. 6
1929Tylaster priscum Valette pp. 29-36 figs. pl. 5, fig. 1-5
1929Tylasteria prisca Valette p. 418
1935Tylaster priscum Mercier pp. 17-18 figs. pl. 1, fig. 9a-d
1992Tylasteria prisca Breton pp. 252-259 figs. fig. 109; pl. 28, fig. 11; pl. 29; pl. 3

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

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 stellate, robust. Disk and arms clearly differentiated. Interbrachial arc concave. Arms slender. Marginal plates short, numerous. Superomarginal and inferomarginal plates alternating. One row of abactinal plates separates the superomarginals on the entire arm length. Inferomarginals larger than the superomarginals. Profile of the superomarginal convex. Profile of the inferomarginals angular. Abradial side of the marginals verticals. External face domed. Ornament of large, dense granule-pits, of variable size. The largest ones projecting in the center of the external face. Adradial side of the superomarginals smooth. Terminal conical, with distally a face for articulation of one spine.