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Pseudononion

Globothalamea - Rotaliida - Nonionidae

Taxonomy
Pseudononion was named by Asano (1936) [Sepkoski's age data: T Dani R]. It is extant. It was considered unknown by Asano (1936).

It was assigned to Nonioninae by Asano (1936); and to Foraminiferida by Sepkoski (2002).

Synonymy list
YearName and author
1936Pseudononion Asano
2002Pseudononion Sepkoski

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RankNameAuthor
kingdomChromistaCavalier-Smith 1981
subkingdomRhizaria()
phylumForaminifera(Eichwald 1830)
classGlobothalamea
orderRotaliidaDelage and Herouard 1896
RankNameAuthor
superfamilyNonionaceaSchultze 1854
familyNonionidaeSchultze 1854
subfamilyNonioninaeSchultze 1854
genusPseudononion

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.

G. Pseudononion Asano 1936
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Diagnosis
ReferenceDiagnosis
K. Asano 1936Test free, bilaterally asymmetrical, dorsal side partially involute, leaving previous whorls uncovered, ventral side completely involute, having no elongate lobe at the umbilicus; chambers numerous, earlier ones only visible on one side of test; wall calcareous, finely perforate; aperture a narrow slit at base apertural face. Pliocene - Recent.
This new genus was derived from a planispirally involute form, probably Nonion, by an asymmetrical arrangement of the later chambers; already in Nonionella, a distinct, elongate lobe is developed at the umbilicus on the ventral side of the test. It is now represented by a single species P. japonicum, the genotype which is common in the Late Tertiary and Recent materials of Japan.