pforams@mikrotax - Globorotalia hessi pforams@mikrotax - Globorotalia hessi

Globorotalia hessi


Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> truncatulinoides lineage -> Globorotalia hessi
Sister taxa: G. cavernula, G. truncatulinoides, G. tosaensis, G. tenuitheca ⟩⟨ G. hessi, G. ronda, G. crassaformis, G. viola ⟩⟨ G. crassaconica, G. crassula

Taxonomy

Citation: Globorotalia hessi Bolli & Premoli Silva, 1973
taxonomic rank: species
Basionym: Globorotalia hessi Bolli & Premoli Silva, 1973

Catalog entries: Globorotalia hessi

Type images:

Distinguishing features:
Parent taxon (truncatulinoides lineage): G. crasula - crassaformis - tosaensis - truncatulinoides lineage, predominantly conicotruncate
This taxon: Like G. crassaformis but more subquadrangular in equatorial view and final chamber is more reduced

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Wall type:
Non-spinose; Smooth [Aze 2011]

Character matrix
test outline:Subquadratechamber arrangement:Trochospiraledge view:Planoconvexaperture:Umbilical-extraumbilical
sp chamber shape:Subrectangularcoiling axis:Lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Subtriangularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Flushumb depth:Shallowwall texture:Smoothshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4-4 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution

Low to middle latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology
Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on comparison with other species of the genus

Most likely ancestor: Globorotalia ronda - at confidence level 2 (out of 5). Data source: Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): in lower part of PT1b subzone (30% up, 0.4Ma, in Ionian stage). Data source: Aze et al. 2011 - extinct, proportion up approximated.
First occurrence (base): near top of PT1a subzone (89% up, 0.7Ma, in Ionian stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).

Plot of occurrence data:

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Bolli, H. M. & Premoli Silva, I. (1973). Oligocene to Recent planktonic foraminifera and stratigraphy of the Leg 15 sites in the Caribbean Sea. Initial Reports of the Deep Sea Drilling Project. 15: 475-497. gs

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

Stewart, D. R. M. I. (2003). Evolution of Neogene globorotaliid foraminifera and Miocene climate change. PhD thesis, Bristol University. 1-269. gs O


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Globorotalia hessi compiled by the pforams@mikrotax project team viewed: 23-4-2024

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Short stable page link: https://mikrotax.org/pforams/index.php?id=104104 Go to Archive.is to create a permanent copy of this page - citation notes



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