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Tritaxilina
Taxonomy
Tritaxilina is a genus. It is extant. It was considered monophyletic by Cushman (1911).
It was assigned to Eggerellidae by Cushman (1911); to Verneuilinidae by Cushman (1927); and to Foraminiferida by Sepkoski (2002).
It was assigned to Eggerellidae by Cushman (1911); to Verneuilinidae by Cushman (1927); and to Foraminiferida by Sepkoski (2002).
Synonymy list
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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. Tritaxilina
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. A. Cushman 1911 | Test triserial, at least in the earlier portion, usually triangular in cross section; aperture central and terminal with or without a distinct neck and lip, rounded; wall usually arenaceous. This genus, as defined by Reuss and employed by Brady, includes those triserial forms which in their earlier development are like Verneuilina and have a textularian aperture, later changing their plan of development so that the newly added chamber occupies nearly or quite the whole of the apertural end of the test. With this change in the chamber comes a change in the aperture to a terminal position and a corresponding change in shape to a circular opening, usually with a raised lip, and in some species with a definite tubular neck as well. |
Measurements
No measurements are available
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| Source: o = order | |||||
| Reference: Kiessling 2004 | |||||
Age range: Late/Upper Eocene or 37.20000 to 33.90000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Eocene | USA (Alaska) | T. colei (189957) |