pforams@mikrotax - Globorotalia eastropacia

pforams@mikrotax - Globorotalia eastropacia pforams@mikrotax - Globorotalia eastropacia

Globorotalia eastropacia

Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> hirsuta lineage -> Globorotalia eastropacia
Sister taxa: G. hirsuta, G. eastropacia, G. margaritae, G. juanai ⟩⟨ G. bermudezi, G. scitula, G. praescitula ⟩⟨ G. cibaoensis, G. gigantea, G. challengeri

K_S 1983 33-1.JPG
Lam & Leckie 2020 pl22 16 19-20.jpg

Taxonomy

Citation: Globorotalia eastropacia Boltovskoy, 1974

Rank: Species

Basionym: Globorotalia hirsuta eastropacia Boltovskoy, 1974

Synonyms:

Globorotalia (Hirsutella) theyeri Fleisher, 1974 = Globorotalia theyeri Fleisher, 1974

Taxonomic discussion: G. theyeri and G. eastropacia are widely accepted to be synonyms (e.g by Kennett & Srinivasan 1983), and the taxon has usually been named G. theyeri. However, Brummer & Kucera (2022) showed that G. eastropacia has priority (publishedin Jan 1974 vs April 1974) and so is the correct name.

Catalog entries: Globorotalia (Hirsutella) theyeri, Globorotalia hirsuta eastropacia

Type images:

holotype: G. (Hirsutella) theyeri
holotype: G. (Hirsutella) theyeri
paratype: G. (Hirsutella) theyeri
paratypes: G. (Hirsutella) theyeri

Distinguishing features:
Parent taxon (hirsuta lineage): G. scitula - juanai - margaritae - hirsuta lineage
This taxon: Distinct but thin peripheral keel and strongly recurved spiral sutures, lobate outline

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:

K_S 1983 31-2.JPG

Non-spinose; Smooth [Aze 2011]

Size:

>150µm

Character matrix
test outline: Stellate chamber arrangement: Trochospiral edge view: Inequally biconvex aperture: Umbilical-extraumbilical
sp chamber shape: Crescentic coiling axis: Low periphery: Single keel aperture border: Thick lip
umb chbr shape: Subtriangular umbilicus: Narrow periph margin shape: Subangular accessory apertures: None
spiral sutures: Weakly depressed umb depth: Shallow wall texture: Smooth shell porosity: Macroperforate: >2.5µm
umbilical or test sutures: Weakly depressed final-whorl chambers: 4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Similar species

This species differs from Gr. (H.) scitula in having a distinct but thin peripheral keel and more strongly recurved spiral sutures. [Kennett & Srinivasan 1983]

Geographic distribution

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

In modern oceans a common, temperate water, species [SCOR WG138]

Map of distribution from ForCenS database

ForCenS G_theye.jpg

Isotope paleobiology

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

Phylogenetic relations

Gr. (H.) theyeri evolved from Gr. (H.) margaritae from which it is distinguished by its distinctly flattened spiral side, its flaring chambers of the final whorl, and a relatively large umbilicus. [Kennett & Srinivasan 1983]

Biostratigraphic distribution

Geological Range:
Notes: Early Pliocene Zone N19 to Recent. Tropical. [Kennett & Srinivasan 1983]
Last occurrence (top): Extant. Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N19 zone (4.37-5.20Ma, base in Zanclean stage). Data source: Kennett & Srinivasan 1983

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Globorotalia eastropacia, synonyms included - Globorotalia eastropacia; Globorotalia hirsuta eastropacia; Globorotalia theyeri;
See also space-time plot :: Samples map :: Parent: hirsuta lineage

Primary source for this page: Kennett & Srinivasan 1983, p.140

References:

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

Brummer, G-J. A. & Kucera, M. (2022). Taxonomic review of living planktonic foraminifera. Journal of Micropalaeontology. 41: 29-74. gs

Fleisher, R. L. (1974a). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project. 23: 1001-1072. gs

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

Lam, A. & Leckie, R. M. (2020a). Late Neogene and Quaternary diversity and taxonomy of subtropical to temperate planktic foraminifera across the Kuroshio Current Extension, northwest Pacific Ocean. Micropaleontology. 66(3): 177-268. gs

Siccha, M. & Kucera, M. (2017). ForCenS, a curated database of planktonic foraminifera census counts in marine surface sediment samples. Scientific Data. 4(1): 1-12. gs

Globorotalia eastropacia compiled by the pforams@mikrotax project team viewed: 5-6-2023

Taxon Search:

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AphiaID: 1567942 Nomenclatural data on WoRMS
Short stables page link: https://mikrotax.org/pforams/index.php?id=104134 Go to Archive.is to create a permanent copy of this page - citation notes

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test outline:	Stellate	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	Low	periphery:	Single keel	aperture border:	Thick lip
umb chbr shape:	Subtriangular	umbilicus:	Narrow	periph margin shape:	Subangular	accessory apertures:	None
spiral sutures:	Weakly depressed	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Weakly depressed	final-whorl chambers:	4.0-5.0	N.B. These characters are used for advanced search. N/A - not applicable