pforams@mikrotax - Rectoguembelina cretacea

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pforams@mikrotax - Rectoguembelina cretacea pforams@mikrotax - Rectoguembelina cretacea

Rectoguembelina cretacea

Classification: pf_cenozoic -> Guembelitrioidea -> Heterohelicidae -> Rectoguembelina -> Rectoguembelina cretacea
Sister taxa: R. cretacea, R. sp.

Olsson_etal_99_pl71_f024-26.jpg

Taxonomy

Citation: Rectoguembelina cretacea Cushman 1932

Taxonomic rank: species

Basionym: Rectoguembelina cretacea

Synonyms:

Rectogumbelina cretacea Cushman 1932:6, pl. 1: figs. 11, 12 [upper Maastrichtian, Arkadelphia Clay, Hope, Arkansas],
Tubitextularia laevigata Loeblich and Tappan, 1957a: 180, pl. 41: fig. 6 [lower Paleocene, McBryde Limestone Mbr., Clayton Fm., Wilcox Co., Alabama]. [Olsson et al. 1999]

Taxonomic discussion: The Paleocene holotype of T. laevigata Loeblich and Tappan is very similar to the R. cretacea holotype (Plate 13: Figures 1,2) except for the presence of more globular chambers in the uniserial growth stage. Paleocene specimens of Rectoguembelina from DSDP Site 357, however, bear uniserial chambers that range in shape from the globular forms of the T. laevigata holotype to forms identical to the R. cretacea holotype (Plate 71: Figures 24-26). It is on this basis that T. laevigata is considered a junior synonym of R. cretacea. [Olsson et al. 1999]

Catalog entries: Rectoguembelina cretacea, Tubitextularia laevigata

Type images:

holotype: R. cretacea
holotype: R. cretacea
holotype: R. cretacea
topotype: R. cretacea
topotype: R. cretacea

Distinguishing features:
Parent taxon (Rectoguembelina): Transition from biserial to uniserial portion of test very abrupt, occurring after first four or more pairs of biserial chambers, without an intervening interval of gradually increasing chamber overlap. Apertures on biserial portion interiomarginal with a small, narrow arch; apertures on uniserial chambers terminal, circular, and aligned in rectilinear fashion, without lip or toothplate. Wall calcareous, microperforate; surface smooth to finely pustulose.
This taxon: Distinguished by its small, elongate biserial to uniserial test, usually with two to four uniserial chambers arranged in a rectilinear fashion and bearing a simple, terminal, round to oval-shaped aperture on a short neck.

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

Diagnostic characters:

Distinguished by its small, elongate biserial to uniserial test, usually with two to four uniserial chambers arranged in a rectilinear fashion and bearing a simple, terminal, round to oval-shaped aperture on a short neck. [Olsson et al. 1999]

Character matrix
test outline: Elongate chamber arrangement: Biserial edge view: Equally biconvex aperture: Terminal
sp chamber shape: Globular coiling axis: N/A periphery: N/A aperture border: Thin lip
umb chbr shape: Globular umbilicus: N/A periph margin shape: Moderately rounded accessory apertures: None
spiral sutures: Strongly depressed umb depth: N/A wall texture: Smooth shell porosity: Microperforate: <1µm
umbilical or test sutures: Strongly depressed final-whorl chambers: 1-1 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

This species has a very irregular distribution, occurring only in near-shore sediments during the Maastrichtian and in offshore sediments at several deep sea sites during the Paleocene, ranging from the low to middle latitudes. [Olsson et al. 1999]

Isotope paleobiology

Stable isotopic evidence that R. cretacea inhabited upper surface waters is presented in Huber and Boersma (1994, table 1; = T. laevigata). The oxygen isotopic data reveal that R. cretacea was more than 1.5%o more negative than the co-occurring benthic species Nuttalites truempyi, and it was more than 0.5 %o more negative than three other planktonic species (Globoconusa daubjergensis, Globanomalina compressa, and Globanomalina sp.). [Olsson et al. 1999]

Phylogenetic relations

The origin ofR. cretacea is uncertain, but test dissections have revealed that apertures in the biserial growth stage are asymmetrically positioned and partially surrounded by a narrow lip of equidimensional thickness, which is identical to the apertures on biserial chambers of Zeauvigerina waiparaensis. This suggests that Rectoguembelina and Zeauvigerina shared a common phylogenetic stock, and Laeviheterohelix is suggested as the most closely related ancestral taxon based on similarities discussed in Huber and Boersma (1994). [Olsson et al. 1999]

Biostratigraphic distribution

Geological Range:
Notes: Maastrichtian through Zone P2. [Olsson et al. 1999]
Last occurrence (top): within P2 zone (62.29-62.60Ma, top in Danian stage). Data source: Olsson et al. 1999
First occurrence (base): within A. mayaroensis zone (67.64-69.27Ma, base in Maastrichtian stage). Data source: Olsson et al. 1999

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: Rectoguembelina cretacea, synonyms included - Rectoguembelina cretacea;
See also space-time plot :: Samples map :: Parent: Rectoguembelina

Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 94

References:

Cushman, J. A. (1932). Rectoguembelina, a new genus from the Cretaceous. Contributions from the Cushman Laboratory for Foraminiferal Research. 8(1): 4-7. gs

Loeblich, A. R. & Tappan, H. (1957b). Planktonic foraminifera of Paleocene and early Eocene Age from the Gulf and Atlantic coastal plains. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin . 215: 173-198. gs

Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs

Rectoguembelina cretacea compiled by the pforams@mikrotax project team viewed: 15-3-2025

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Short stable page link: https://mikrotax.org/pforams/index.php?id=100270 Go to Archive.is to create a permanent copy of this page - citation notes

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Comments (2)

Kirsty Edgar

Hi Jeremy, As this species spans the K/Pg it seems to have two entries and the one accessed through the Mesozoic database has a lot less info on it. Is it possible to remove this duplication by making sure that the link goes to the same page (the one in the Paleogene with more info and correct range info)? Cheers, Kirsty

12 November 2017 14:04

Jeremy Young(UK)

Hi Kirsty

Fair point , having separate Cenozoic and Mesozoic modules is a bit of a problem for the very few taxa which do go across. There is no neat solution to this (yet) but I will think abut it (and I am so looking forward to be ing able to merge the Neogene and Paleogene when we finally have the oligocene content).

Jeremy

14 November 2017 14:37

test outline:	Elongate	chamber arrangement:	Biserial	edge view:	Equally biconvex	aperture:	Terminal
sp chamber shape:	Globular	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Globular	umbilicus:	N/A	periph margin shape:	Moderately rounded	accessory apertures:	None
spiral sutures:	Strongly depressed	umb depth:	N/A	wall texture:	Smooth	shell porosity:	Microperforate: <1µm
umbilical or test sutures:	Strongly depressed	final-whorl chambers:	1-1	N.B. These characters are used for advanced search. N/A - not applicable