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Hesperocystis

Rhombifera - Glyptocystitidae

Taxonomy
Hesperocystis was named by Sinclair (1945) [Sepkoski's age data: O Cara-l]. Its type is Hesperocystis deckeri.

It was assigned to Glyptocystitidae by Sprinkle (1982); and to Rhombifera by Sepkoski (2002).

Synonymy list
YearName and author
1945Hesperocystis Sinclair
1982Hesperocystis Sprinkle pp. 252 - 251
2002Hesperocystis Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
RankNameAuthor
subphylumBlastozoaSprinkle 1973
classRhombiferaZittel 1879
superfamilyGlyptocystitoidaBather 1899
familyGlyptocystitidaeBather 1899
genusHesperocystisSinclair 1945

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. Sprinkle 1982Thecal shape ovoid to globular, summit slightly domed and tilted toward periproct, base subconical; BB narrow with small stem facet, ILL circlet closed, LL circlet open, R5 very small; periproct small, surrounded by 4 thecal plates (IL4, L4, L5, and R4); 20 to 22 rhombe and demirhombs; ambulacra medium length, extending short distance down theca in RR sinuses, 1 to 4 brachioles per flooring plate set, 1 to 3 brachioles on each of 5 00; stem small, not greatly enlarged proximally, lacking alternating columnals.