pforams@mikrotax - Globorotalia bermudezi

pforams@mikrotax - Globorotalia bermudezi pforams@mikrotax - Globorotalia bermudezi

Globorotalia bermudezi

Classification: pf_cenozoic -> Globorotaliidae -> Globorotalia -> hirsuta lineage -> Globorotalia bermudezi
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 33-4.JPG
LoeblichTappan 1994 pl179 08-10.JPG

Taxonomy

Citation: Globorotalia bermudezi Rögl & Bolli 1973

Taxonomic rank: species

Basionym: Globorotalia bermudezi Rögl & Bolli 1973

Taxonomic discussion: Regarded as a distinct species by Aze et al. (2011) and by Kennett & Srinivasan (1983), but not by the SCOR138 working group on extant planktonic foraminifera, they consider it a variant of G. scitula.

Catalog entries: Globorotalia bermudezi
Type images:
holotype: G. bermudezi
holotype: G. bermudezi
paratype: G. bermudezi
paratypes: G. bermudezi
paratypes: G. bermudezi

Distinguishing features:
Parent taxon (hirsuta lineage): G. scitula - juanai - margaritae - hirsuta lineage
This taxon: Like G. scitula but much smaller, has inflated chambers on the umbilical side, and a more irregularly perforated test.
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

Morphology:
Test very small, low trochospiral, equatorial periphery subcircular, lobulate, axial periphery broadly rounded to subangular, slightly biconvex; five to six chambers in the final whorl; increasing uniformly in size as added, chambers on umbilical side more inflated; sutures on spiral side curved, depressed; on umbilical side sinuously radial, depressed; surface thin, smooth, with irregularly distributed small, circular pores; umbilicus open, deep; aperture a low arch with a distinct but thin lip, interiomarginal, umbilical-extraumbilical. [Kennett & Srinivasan 1983]

Size:
Very small

Character matrix
test outline: Lobate chamber arrangement: Trochospiral edge view: Inequally biconvex aperture: Umbilical-extraumbilical
sp chamber shape: Crescentic coiling axis: Low periphery: N/A aperture border: Thin 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: 5-6 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Phylogenetic relations
Gr. (H.) bermudezi is considered to have evolved from Gr. (H.) scitula in the latest Pliocene. Gr. (H.) bermudezi is much smaller, possesses inflated chambers on the umbilical side, and exhibits a more irregularly perforated test than G. (H.) scitula. [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotalia scitula - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983; Stewart 2003 fig. 6.10; Aze et al. 2011;.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Kennett & Srinivasan 1983
First occurrence (base): within N22 zone (0.00-1.93Ma, base in Gelasian 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
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) 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
Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs
Loeblich, A. & Tappan, H. (1994). Foraminifera of the Sahul shelf and Timor Sea. Cushman Foundation for Foraminiferal Research, Special Publication. 31: 1-661. gs O
Rögl, F. & Bolli, H. M. (1973). Holocene to Pleistocene planktonik foraminifera of LEG 15, site 147 (Cariaco Basin (Trench), Caribbean Sea) and their climatic interpretation. Initial Reports of the Deep Sea Drilling Project. 15: 553-579. gs O

Globorotalia bermudezi compiled by the pforams@mikrotax project team viewed: 16-11-2025

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test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Inequally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	Low	periphery:	N/A	aperture border:	Thin 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:	5-6	N.B. These characters are used for advanced search. N/A - not applicable