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Deltacystis

Rhombifera - Pleurocystitidae

Taxonomy
Deltacystis was named by Sprinkle (1974) [Sepkoski's age data: O Llvi-l Sepkoski's reference number: 325]. Its type is Deltacystis symmetricus. It is the type genus of Deltacystinae.

It was assigned to Pleurocystitidae by Sprinkle (1974); to Rhombifera by Sepkoski (2002); and to Deltacystinae by Sumrall and Sprinkle (1995) and Nardin and Bohatý (2013).

Synonymy list
YearName and author
1974Deltacystis Sprinkle p. 1187
1995Deltacystis Sumrall and Sprinkle p. 776
2002Deltacystis Sepkoski, Jr.
2013Deltacystis Nardin and Bohatý p. 541

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
RankNameAuthor
subphylumBlastozoaSprinkle 1973
classRhombiferaZittel 1879
superfamilyGlyptocystitoidaBather 1899
familyPleurocystitidaeNeumayr 1889
subfamilyDeltacystinae
genusDeltacystis

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 1974Flattened pleurocystitid cystoids having a rounded triangular shape and a nearly symmetrical profile. Plating arrange- ment nearly symmetrical but abnormal for this family; BB, ILL, and LL circlets well devel- oped, closed (?), and present on both calyx sur- faces, RR and 00 circlets greatly reduced in size. Periproct small, occupying only 10-20%1 of the ventral side and containing relatively few, medium-sized periproctals. No pectini- rhombs present externally, although traces of slits have been observed internally on L4? and perhaps B2?. Two long biserial brachioles attached to summit beside central mouth, with brachiolar food groove running along inside dorsal surface. Proximal stem enlarged with smooth columnals; distal stem bears elongate flanged and smooth columnals