Trilobatus

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Trilobatus
Sister taxa: Beella, Catapsydrax, Clavatorella, Globigerina, Globigerinella, Globigerinoides, Globigerinoidesella, Globoturborotalita, Orbulina, Orcadia, Paragloborotalia, Praeorbulina, Protentella, Sphaeroidinella, Sphaeroidinellopsis, Trilobatus, Turborotalita,
Daughter taxa (blue => in age window 0-300Ma)



Taxonomy

Citation: Trilobatus Spezzaferri et al. 2015
Rank: genus
Type species: Trolobatus trilobus
Taxonomic discussion: The genus Globigerinoides was used by Kennett & Srinivasan (1983) and many other workers for all Neogene  Globigerina-type species with supplementary apertures, but it was long suspected that this was a polyphyletic group. Spezzaferri et al. (2015) conclusively proved this polyphyly using both stratophentic and molecular genetic data and so divided the species into two groups - Trilobatus and Globigerinoides, as used here. They have spearate origins and different wall structures.

Catalog entries: Trilobatus;

Type images:

Short diagnosis: Supplementary apertures and cancellate wall

Description


Wall type: The wall texture is cancellate, spinose and sacculifer–type sensu Hemleben et al. 1989. [Spezzaferri et al. 2015]

Test morphology: Test low trochospiral, involute and compact in the initial whorls, later becoming slightly evolute to evolute. The test is from ovate to subtriangular or subrectangular to slightly lobate in outline with rounded peripheral margin with three to four subspherical cham- bers in the last whorl, increasing rapidly in size. The last chamber may become embracing and comprise one half of the test or it may become irregularly shaped and flattened. Sutures are depressed, straight to slightly curved on both sides, the umbilicus is often narrow and concealed. The primary aperture is an umbilical-extraumbilical elongated slit, tending toward the margin in many species. Supplementary apertures on the spiral side are irregular slits or low arches placed at the intersection of the spiral and radial sutures. [Spezzaferri et al. 2015]

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Chattian Stage (23.03-28.09Ma, base in Chattian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Primary source for this page: Spezzaferri et al. 2015

References:

Hemleben, C.; Spindler, M. & Anderson, O., (1989). Modern Planktonic Foraminifera. Springer-Verlag, New York.

Kennett, J.P. & Srinivasan, M.S., (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania, 1-265 pp.

Spezzaferri, S. & others, (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.


Trilobatus compiled by the pforams@mikrotax project team viewed: 24-6-2017

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