Daughter taxa (time control age-window is: 0-800Ma) | ||||
sacculifer group (conspecific in modern ocean) | ||||
Trilobatus sacculifer Low trochospiral, chambers spherical except final one which is sac-like on mature specimens | ||||
Trilobatus quadrilobatus 3½-4 globular chambers in the last whorl. | ||||
Trilobatus immaturus Like T. trilobus but slightly more lobate and the primary aperture is a low umbilical arch across the antepenultimate chamber. | ||||
Trilobatus trilobus 3 globular chambers in the last whorl, slit-like aperture | ||||
transitional to Orbulina | ||||
Trilobatus bisphericus Bilobate outline, enveloping last chamber almost completely hides the umbilicus | ||||
Trilobatus sicanus Subspherical to spherical | ||||
other species | ||||
Trilobatus altospiralis Like T. primordius but with a high trochospire, up to 4 chambers in the last whorl, and slit-like primary and supplementary apertures. | ||||
Trilobatus praeimmaturus Like T. immaturus and T. trilobus but more subcircular and compact outline; aperture slit-like encompassing the penultimate chamber, and usually 4 chambers in the final whorl. | ||||
Trilobatus primordius Last chamber forms half of the test; low trochospiral, lobulate; 3½ globular, slightly embracing chambers in the last whorl, increasing rapidly in size; sutures depressed; Primary aperture umbilical arch with a thin rim; one small arched supplementary sutural aperture. | ||||
Trilobatus subsacculifer Like T. sacculifer but last chamber only weakly sac-like chamber; test generally smaller; tande primary aperture is a lower and smaller | ||||
Trilobatus sp. Specimens which cannot be assigned to established species |
Catalog entries: Trilobatus, Trilobigerina
Distinguishing features:
Parent taxon (Globigerinidae): Wall spinose, usually with 3½-6 globular chambers in final whorl, trochospiral or planispiral
This taxon: Supplementary apertures and cancellate wall.
Morphology:
Wall type:
Geographic distribution
Phylogenetic relations
Most likely ancestor: Globoturborotalita - at confidence level 3 (out of 5). Data source: Spezzaferri et al 2018.
Likely descendants: Globigerinoidesella; Praeorbulina;
plot with descendants
Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within O6 zone (25.21-26.93Ma, base in Chattian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Primary source for this page: Spezzaferri et al. 2015; Spezzaferri et al. 2018
Hemleben, C., Spindler, M. & Anderson, O. (1989). Modern Planktonic Foraminifera. Springer-Verlag, New York. -. gs Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs Reuss, A. E. (1850). Neue Foraminiferen aus den Schichten des Osterreichischen Tertiarbeckens. Denkschriften der kaiserlichen Akademie der Wissenschaften zu Wien. 1: 365-390. gs O Spezzaferri, S. et al. (2015). Fossil and genetic evidence for the polyphyletic nature of the planktonic foraminifera "Globigerinoides", and description of the new genus Trilobatus. PLoS One. 1-20. gs Spezzaferri, S., Olsson, R. K. & Hemleben, C. (2018c). Taxonomy, biostratigraphy, and phylogeny of Oligocene to Lower Miocene Globigerinoides and Trilobatus. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 9): 269-306. gs References:
Trilobatus compiled by the pforams@mikrotax project team viewed: 5-11-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=104239 Go to Archive.is to create a permanent copy of this page - citation notes |