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Tyrridiocystis

Rhombifera - Echinoencrinitidae

Taxonomy
Tyrridiocystis was named by Broadhead and Strimple (1978) [Sepkoski's age data: D Gedi Sepkoski's reference number: 327]. It is not extant.

It was assigned to Rhombifera by Sepkoski (2002); and to Echinoencrinitidae by Paul and Rozhnov (2016).

Synonymy list
YearName and author
1978Tyrridiocystis Broadhead and Strimple
2002Tyrridiocystis Sepkoski, Jr.
2016Tyrridiocystis Paul and Rozhnov p. 261

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
RankNameAuthor
subphylumBlastozoaSprinkle 1973
classRhombiferaZittel 1879
superfamilyGlyptocystitoidaBather 1899
familyEchinoencrinitidaeBather 1899
genusTyrridiocystisBroadhead and Strimple 1978

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
C. R. C. Paul and S. V. Rozhnov 2016Glyptocystitoid family with reduced oral area, with theca composed of 26 or 25 plates arranged in five circlets according to the formula: 4 basals (B, plural BB), 5 infralaterals (ILL), 5 laterals (LL), 4 or 5 radials (RR), and 7 orals (OO), with disjunct pectinirhombs.