Globorotalia margaritae

: Variants - not recognised by all workers (time control age-window is: 0-800Ma)
			Globorotalia evoluta larger and with a more symmetrical profile
			Globorotalia primitiva smaller and lacks a complete keel

Taxonomy

Catalog entries: Globorotalia margaritae

Distinguishing features:
Parent taxon (hirsuta lineage): G. scitula - juanai - margaritae - hirsuta lineage
This taxon: Like G. juanai & scitula, but more convexly rounded spiral side and concave to flat umbilical side; more delicate peripheral keel, and in the distinctly elongate, narrower, and more strongly curved chambers on spiral side.

Description

Diagnostic characters:

Biogeography and Palaeobiology

Geographic distribution

Most likely ancestor: Globorotalia juanai - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 15; Stewart 2003 fig. 6.10; Aze et al. 2011, appendix 5.
Likely descendants: Globorotalia evoluta; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Gr. (H) margaritae has a short stratigraphic range and is a generally recognized index species for the tropical to temperate Early Pliocene (Bolli, 1970; Srinivasan et al.,1981) .
Last occurrence (top): at top of PL2 zone (100% up, 3.9Ma, in Zanclean stage). Data source: Wade et al. (2011), zonal marker
First occurrence (base): near base of M14 [Atl.] zone (14% up, 6.1Ma, in Messinian 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:

• 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 margaritae, synonyms included - Globorotalia hirsuta praehirsuta; Globorotalia mararitae; Globorotalia margaritae; Globorotalia margaritae evoluta; Globorotalia margaritae margaritae; Globorotalia margaritae margaritae (q); Globorotalia margaritae praehirsuta; Globorotalia margaritae primitiva; Globorotalia margaritae s.l.; Globorotalia praehirsuta; Globorotalia primitiva; Hirsutella margaritae;
• See also space-time plot :: Samples map :: Parent: hirsuta lineage

Primary source for this page: Kennett & Srinivasan 1983, p.136

Globorotalia margaritae compiled by the pforams@mikrotax project team viewed: 16-11-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=104110 Go to Archive.is to create a permanent copy of this page - citation notes

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