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Helicoplacus

Helicoplacoidea - Helicoplacidae

Synonyms
Synonymy list
YearName and author
1963Helicoplacus Durham and Caster p. 822 fig. 1
1967Helicoplacus Durham p. 100
1993Helicoplacus Durham p. 600
1993Westgardella Durham p. 601
2002Helicoplacus Sepkoski, Jr.
2002Westgardella Sepkoski, Jr.
2006Helicoplacus Wilbur p. 290

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
RankNameAuthor
phylumEchinodermata
classHelicoplacoidea
familyHelicoplacidaeDurham and Caster 1966
genusHelicoplacus

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
J. W. Durham 1967Ambulacrum branched, plating simple, with large laterals and a few small medial plates.
J. W. Durham 1993Helicoplacidae with longitudinal ridges or pus- tulose ornamentation on external surface of plates of medial column of interambulacra.
J. W. Durham 1993 (Westgardella)Helicoplacids with 10 interambulacral areas between primary ambulacrum and its continuation in next volution; external surface of plates of medial interambulacral column smooth; plates often produced into distal angulation or prominent spine; tubefeet emerging from interior through grooves in sequential plates.
B. C. Wilbur 2006Helicoplacoids with differentiated ambulacra and interambulacra. Coverplates and floorplates contiguous, with two coverplate rows, and a third covering the mouth.