|Daughter taxa (time control age-window is: 0-800Ma)||Granddaughter taxa|
Initially biserial may become multiserial, smooth, microperforate wall; aperture simple (no lip or toothplate).
Like Chiloguembelina but with an internal plate connecting successive chambers, a prominent extension of an apertural collar, and a smoother surface texture.
Taxonomic discussion: Molecular genetic data on the extant species Gallitelia vivans and Streptochilus globigerus has shown that they fall outside the clade of the other extant planktic foraminifera and so have separate origins from the benthic foraminifera (Darling et al. 2007, Ujiie et al. 2008). The same may apply to some fossil taxa currently placed in the Guembelitriodea.
These two taxa are not directly related but it is convenient to group them here.
Catalog entries: Bolivinidae [no catalog entry yet]
Parent taxon (pf_cenozoic): This is a polyphyletic gruoping including all Cenozoic planktonic foraminifera
This taxon: Biserial (separate evolutionary origin)
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): in upper part of Lutetian Stage (69% up, 43.2Ma, in Lutetian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Benthic origins compiled by the pforams@mikrotax project team viewed: 22-10-2021
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