Basic info | Taxonomic history | Classification | Included Taxa |
Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Pseudononion
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).
It was assigned to Nonioninae by Asano (1936); and to Foraminiferida by Sepkoski (2002).
Is something missing? Join the Paleobiology Database and enter the data
|
|
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
show all | hide all
Diagnosis
Reference | Diagnosis | |
---|---|---|
K. Asano 1936 | Test 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. |
Measurements
No measurements are available
|
|
||||
|
|||||
|
|
||||
Source: o = order | |||||
Reference: Kiessling 2004 |
Age range: base of the Priabonian to the top of the Early/Lower Miocene or 38.00000 to 15.97000 Ma
Collections (3 total)
Time interval | Ma | Country or state | Original ID and collection number |
---|---|---|---|
Early/Lower Eocene - Middle Eocene | Trinidad and Tobago | P. atlanticum, P. modesta, P. subgrateloupi (140160) | |
Priabonian | USA (Louisiana) | P. spissus, P. sp. (55251) | |
Early/Lower Miocene | USA (California) | P. costiferum (196169) |