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Orbigniana

Echinoidea -

Taxonomy
Orbignyana was named by Ebray (1860) [Sepkoski's age data: J Bajo-u J Bath Sepkoski's reference number: 934]. It is not extant.

It was corrected as Orbigniana by Barras (2007).

It was assigned to Collyritidae by Wagner and Durham (1966); to Disasteroida by Sepkoski (2002); and to Atelostomata by Barras (2007).

Synonymy list
YearName and author
1860Orbignyana Ebray
1966Orbignyana Wagner and Durham p. U526
2002Orbignyana Sepkoski, Jr.
2007Orbigniana Barras pp. 152 - 154

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
subphylumEchinozoa
RankNameAuthor
classEchinoidea()
subclassEuechinoideaBronn 1860
infraclassAcroechinoidea()
Carinacea
Irregularia()
Atelostomata
genusOrbigniana(Ebray 1860)

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. G. Barras 2007Stem group Atelostomata with an elongate disjunct apical disc. The disc contains a number of complemental plates that preclude the direct contact of oculars II and IV and also of genitals 1 and 4 (Fig. 4D). The disc trivium and bivium are joined by a short string of complemental plates, similar in size to the genitals. The genus retains the primitive periproctal groove (Pl. 1, fig. 6a) and also phyllodes (Fig. 10F) and a peristomial well (Pl. 1, fig. 6b).