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Morphology Ecology and taphonomy   Age range and collections

Trichasteropsida

Asteroidea - Trichasteropsida

Synonymy list
YearName and author
1987Trichasteropsida Blake
1989Trichasteropsida Blake p. 213
2002Trichasteropsida Sepkoski, Jr.
2003Trichasteropsida Blake and Hagdorn p. 35
2006Trichasteropsiida Blake et al. p. 286
2017Trichasteropsida Blake et al. p. 324

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
subphylumAsterozoa
RankNameAuthor
classAsteroidea
subclassAmbuloasteroidea
infraclassNeoasteroidea()
superorderForcipulatacea
orderTrichasteropsida
orderTrichasteropsida

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
D. B. Blake and H. Hagdorn 2003Neoasteroidea with disk relatively large, body thickened, arms gradually tapering, arched; arm tips rounded. Marginals in single series, morphologically differentiated from ossicles of adjacent ossicles. Distal marginals at least weakly enlarged in most specimens. Abactinal surface where known at least weakly reticulated, with transverse and longitudinal series enclosing areas of smaller, irregular(?) ossicles. Actinal ossicles numerous, robust, in multiple series forming a triangular field terminating along the arms but not reaching terminal. Actinal-surface spines on adambulacrals, actinals of at least some species spines uniform, robust, conical or flattened; ambulacrals, adambulacrals not otherwise differentiated. Pedicellariae unknown.