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Pygorhytis

Echinoidea -

Taxonomy
Pygorhytis was named by Pomel (1883) [Sepkoski's age data: J Bajo J Call Sepkoski's reference number: 1242]. It is the type genus of Pygorhytidae.

It was assigned to Pygorhytinae by Jesionek-Szymanska (1963); to Collyritidae by Wagner and Durham (1966); to Disasteroida by Sepkoski (2002); to Atelostomata by Barras (2007); and to Microstomata by Kroh and Smith (2010).

Synonymy list
YearName and author
1883Pygorhytis Pomel
1963Pygorhytis Jesionek-Szymanska p. 358
1966Pygorhytis Wagner and Durham p. U527
2002Pygorhytis Sepkoski, Jr.
2007Pygorhytis Barras p. 154
2010Pygorhytis Kroh and Smith p. 171

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
subphylumEchinozoa
RankNameAuthor
classEchinoidea()
subclassEuechinoideaBronn 1860
superorderAcroechinoidea()
Carinacea
Irregularia()
Microstomata
genusPygorhytis

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 a clearly disjunct apical disc containing a small number of complemental plates (Fig. 2C). The complemental plates preclude the direct contact of oculars II and IV. The periproct lies at the posterior of the test in a slight depression, the remnant of a periproctal groove (Pl. 2, fig. 1c). The genus retains the primitive short phyllodes (Fig. 10G) and the peristome lies in a slight depression (Pl. 2, fig. 1b).