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Pycinaster crassus

Asteroidea - Valvatida - Pycinasteridae

Taxonomy
Pycinaster crassus was named by Spencer (1907). It is not extant. Its type specimen is Holotype BNHM OR 35498, Paratypes BNHM E 2576, E 2628, E 2632a,b.

Synonymy list
YearName and author
1907Pycinaster crassus Spencer pp. 96-97 figs. fig. 24; pl. 29, fig. 1-5
1913Pycinaster crassus Spencer p. 125 figs. pl. 15, fig. 4
1915Pycinaster crassus Valette pp. 38-39 figs. fig. 12
1935Pycinaster crassus Mercier p. 12 figs. pl. 1, fig. 4a-b
1936Pycinaster crassus Mercier p. 24
1943Pycinaster crassus BrĂ¼nnich-Nielsen pp. 56-57 figs. pl. 3, fig. 20-21
1950Pycinaster crassus Rasmussen pp. 73-74 figs. pl. 10, fig. 6-7
1979Pycinaster crassus Rasmussen p. 70
1993Pycinaster crassus Lewis p. 64
1997Pycinaster crassus Breton p. 138

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
subphylumAsterozoa
classAsteroidea
RankNameAuthor
subclassAmbuloasteroidea
infraclassNeoasteroidea()
superorderValvatacea
orderValvatida
familyPycinasteridae()
genusPycinaster
speciescrassus

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
H. W. Rasmussen 1950Large size of the marginal plates suggests a large body size. Marginal plates of the disc are long, proportionally thin and high. The upper face has a polygonal outline. Its surface is bulged, more or less covered by homogeneous granule-pits. A strong fold underlined the dorsal margin of the lateral faces, which are markedly concave. Adradial and abradial faces oblique. Median face of articulation with the other raw of marginal plates concave. Lower part of the inferomarginal plate keel-like.