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Morphology Ecology and taphonomy   Age range and collections

Pseudarchaster

Asteroidea - Valvatida - Goniasteridae

Synonymy list
YearName and author
1889Pseudarchaster Sladen p. 109
1966Pseudarchaster Spencer and Wright p. U59
1992Pseudarchaster Clark and Downey pp. 260-261
1999Pseudarchaster Eagle p. 551
2002Pseudarchaster Sepkoski, Jr.

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

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
A. M. Clark and M.E. Downey 1992A genus of Goniasteridae with tabulate or even paxilliform abactinal plates, more than one row extending far out along the arm, usually reaching terminal plate; marginal plates rather broad, tapering smoothly laterally to narrowed ambital edge; one median oral spine at apex of mouth plate pair.
M.K. Eagle 1999Abactinal plates paxilliform, in radial rows; several may extend along arm, usually more than 1 series reaching terminal plate. Unpaired median but not recurved tooth common to each pair of oral plates. Adambulacral armature comprising palmate group of furrow-spines and co-ordinate group of subambulacrals. Numerous actinal intermediate plates. Marginal plates thick, robust, paired, with fasciolar grooves between.