pforams@mikrotax - Globigerinella roeglina

pforams@mikrotax - Globigerinella roeglina pforams@mikrotax - Globigerinella roeglina

Globigerinella roeglina

Classification: pf_cenozoic -> Globigerinidae -> Globigerinella -> Globigerinella roeglina
Sister taxa: G. adamsi, G. calida, G. radians, G. siphonifera ⟩⟨ G. clavaticamerata, G. molinae, G. navazuelensis, G. obesa, G. praesiphonifera, G. pseudobesa, G. roeglina ⟩⟨ G. megaperta, G. wagneri, G. sp.

Olig Atlas pl06-10 13-15.JPG
Olig Atlas pl06-10 16-17 21.JPG
Olig Atlas pl06-10 18-20.JPG

Taxonomy

Citation: Globigerinella roeglina Spezzaferri&Coxall, in Spezzaferri et al. 2018

taxonomic rank: species

Synonyms:

Protentella sp. Spezzaferri 1994, pl. 18, figs. 5a-c [upper Oligocene lower part of Zone P22, DSDP Hole 538A, Gulf of Mexico]; figs. 6a-c [upper Oligocene lower part of Zone P22, ODP Hole 709C, Indian Ocean].
Clavatorella aff. C. nicobarensis Srinivasan and Kennett, 1974.—van Eijden and Smit, 1991:112, pl. 4, fig. 11 [upper Oligocene Zone P22, ODP Site 758, eastern Indian Ocean]. [Not Srinivasan and Kennett, 1974.]

Taxonomic discussion:

Globigerinella roeglina is here established as a new species because its typical morphology is recurrent in the investigated samples and, although generally small, it does not seem to be a juvenile form. Rather it looks like the “base” morphology from which the extreme clavate species of Quiltyella (Q. nazcaensis, and Q. clavacella) evolve. This species shows a moderate intraspecific variability, with specimens characterized by a slightly radially elongated or smaller last chamber. The species was previously identified by Spezzaferri (1994) and informally called “Protentella sp.”. It is here attributed to the genus Globigerinella because of the typical wall texture and because of its tendency to a planispiral coiling mode, even if rarely reached. [Spezzaferri et al. 2018]

Catalog entries: Globigerinella roeglina

Type images:

holotype: G. roeglina
holotype: G. roeglina
paratype: G. roeglina
paratype: G. roeglina
paratype: G. roeglina
paratype: G. roeglina

Distinguishing features:
Parent taxon (Globigerinella): Test initially trochospiral, becoming nearly planispiral; globular to ovate chambers; aperture umbilical; fine spines cover the test
This taxon: Like G. obesa but aperture higher and with thick rim, and last chamber slightly radially elongated

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 low trochospiral consisting of 2 whorls, slightly tending to planispiral, lobulate in outline, chambers globular 4-5 in the last whorl, increasing rapidly in size, if present the last chamber may be either slightly radially elongated or smaller that the last chamber. Sutures are depressed, straight on both sides; the umbilicus is moderately small, open, enclosed by surrounding chambers, aperture an umbilical-extraumbilical high arch sometimes tending to move to completely extraumbilical, bordered by an imperforate and very thick rim. [Spezzaferri et al. 2018]

Wall type:

Spinose, spines are supported by spine collars, which coalesce to form ridges. Pore concentrations average 80 pores/50 μm2 test surface area and pore diameters average 1.5 μm.

Size:

Maximum diameter of holotype around 0.35 mm. [Spezzaferri et al. 2018]

Character matrix
test outline: Lobate chamber arrangement: Pseudoplanispiral edge view: Equally biconvex aperture: Umbilical-extraumbilical
sp chamber shape: Globular coiling axis: Very low periphery: N/A aperture border: Thick lip
umb chbr shape: Globular umbilicus: Wide periph margin shape: Broadly rounded accessory apertures: None
spiral sutures: Strongly depressed umb depth: Deep wall texture: Cancellate shell porosity: Macroperforate: >2.5µm
umbilical or test sutures: Strongly depressed final-whorl chambers: 4-5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Found at low latitudes in the Gulf of Mexico, tropical Indian Ocean and Paratethys sequences of Transylvania. [Spezzaferri et al. 2018]

Isotope paleobiology

Unpublished data of S. Spezzaferri indicate a deep water habitat for this species. [Spezzaferri et al. 2018]

Phylogenetic relations

Probably evolved from Globigerinella obesa in the upper lower Oligocene Zone O4. [Spezzaferri et al. 2018]

Most likely ancestor: Globigerinella obesa - at confidence level 3 (out of 5). Data source: Spezzaferri et al. 2018.
Likely descendants: Quiltyella clavacella; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Sporadic occurrence from lower Oligocene Zone O4 to possibly lower/mid -Miocene Zone M5 (Spezzaferri, 1994). [Spezzaferri et al. 2018]
Last occurrence (top): within M5 zone (15.10-16.38Ma, top in Langhian stage). Data source: Spezzaferri et al. 2018
First occurrence (base): within O4 zone (28.09-29.18Ma, base in Rupelian stage). Data source: Spezzaferri et al. 2018

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: Globigerinella

Primary source for this page: Spezzaferri et al. 2018 - Olig Atlas chap.6 p.202

References:

Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 9): 257-326. gs O

Spezzaferri, S. (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Palaeontographia Italica. 81: 1-187. gs

Spezzaferri, S., Coxall, H. K., Olsson, R. K. & Hemleben, C. (2018a). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 6): 179-214. gs

Srinivasan, M. S. & Kennett, J. P. (1974a). A planktonic foraminifer (Clavatorella) from the Pliocene. Journal of Foraminiferal Research. 4(2): 77-79. gs

van Eijden, A. J. M. & Smit, J. (1991). Eastern Indian Ocean Cretaceous and Paleogene quantitative biostratigraphy. Proceedings of the Ocean Drilling Program, Scientific Results. 121: 77-123. gs

Globigerinella roeglina compiled by the pforams@mikrotax project team viewed: 16-9-2024

Taxon Search:

Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=104320 Go to Archive.is to create a permanent copy of this page - citation notes

Add Comment

Comments

No comments yet. Be the first!

test outline:	Lobate	chamber arrangement:	Pseudoplanispiral	edge view:	Equally biconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Globular	coiling axis:	Very low	periphery:	N/A	aperture border:	Thick lip
umb chbr shape:	Globular	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Strongly depressed	umb depth:	Deep	wall texture:	Cancellate	shell porosity:	Macroperforate: >2.5µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	4-5	N.B. These characters are used for advanced search. N/A - not applicable