pforams@mikrotax - Laeviella bentonensis

Laeviella bentonensis

Classification: pf_mesozoic -> Globigerinelloididae -> Laeviella -> Laeviella bentonensis
Sister taxa: L. tururensis, L. bentonensis, L. bollii, L. primuloides

Falzoni et al 2016 f05-04.JPG
Pessagno 1967 pl49 02-3.JPG
Pessagno 1967 pl76 10-11.JPG
ODP Site 1052-45.JPG
Leckie 1984_11plate10-45.JPG
Eicher Worstell 1970_9f3-45.JPG
Leckie 1984_10f7-8--.JPG

Taxonomy

Citation: Laeviella bentonensis (Morrow, 1934)

Rank: species

Basionym: Anomalina bentonensis

Synonyms:

Planomalina caseyi;
Globigerinella cushmani;
Globigerinelloides bentonensis (Morrow, 1934)

Taxonomic discussion: Comparison of the SEM images of the holotypes of G. bentonensis and G. caseyi reveal that both species have a relatively smooth surface texture, a weakly lobate test outline, a moderately gradual rate of chamber size increase, and a low arched aperture at the base of the final chamber. Paratypes of G. caseyi have between 8 and 9 chambers in the final whorl, which overlaps the final whorl chamber number described for G. bentonensis. For this reason these species are considered synonymous with G. bentonensis designated as the senior synonym because of priority. [copied from Chronos database]

Type images:

holotype: A. bentonensis
holotype: A. bentonensis
holotype: A. bentonensis
holotype: A. bentonensis

Original description: Test small, nearly symmetrical, slightly involute, periphery broadly rounded, earlier whorls partly exposed on both sides at the center; chambers inflated, increasng rather rapidly in size as added, quite uniform in shape, numbering 7-9 in last whorl; sutures strongly impressed, usually curving backward as they pass over the periphery; wall conspicuously perforated; aperture peripheral passing onto the dorsal side.

Entries in the Catalog of original descriptions: Anomalina bentonensis, Planomalina caseyi, Globigerinella cushmani

Emended description:

Morphology:

Wall type:

Size:

Most likely ancestor: Laeviella primuloides - at confidence level 3 (out of 5). Data source: Huber et al. 2022.
Likely descendants: Laeviella tururensis; Laeviella bollii; plot with descendants

Geological Range:
Last occurrence (top): within R. cushmani zone (94.03-95.94Ma, top in Cenomanian stage). Data source: Huber et al. 2022
First occurrence (base): within T. primula zone (107.39-111.84Ma, base in Albian stage). Data source: Huber et al. 2022

Plot of range and 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: Laeviella bentonensis, synonyms included - Alanlordella bentonensis; Globigerinelloides bentonensis; Globigerinelloides caseyi; Planoglobulina carseyi;
See also space-time plot :: Samples map :: Parent: Laeviella

Character matrix
test outline: Ovate chamber arrangement: Planispiral edge view: Hourglass aperture: Equatorial
sp chamber shape: Inflated coiling axis: N/A periphery: N/A aperture border: Thin lip
umb chbr shape: Inflated umbilicus: Wide periph margin shape: Broadly rounded accessory apertures: None
spiral sutures: Moderately depressed umb depth: Shallow wall texture: Smooth shell porosity: -
umbilical or test sutures: Moderately depressed final-whorl chambers: 7.0-9.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Eicher, D. L. & Worstell, P. (1970). Lunatriella, a Cretaceous heterohelicid foraminifer from the western interior of the United States. Micropaleontology. 16(1): 117-121. gs

Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs

Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs V O

Morrow, A. L. (1934). Foraminifera and ostracoda from the Upper Cretaceous of Kansas. Journal of Paleontology. 8: 186-205. gs

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs V O

Laeviella bentonensis compiled by the pforams@mikrotax project team viewed: 4-7-2022

Taxon Search:

Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=110122 Go to Archive.is to create a permanent copy of this page - citation notes

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information

1000

Notify me of new comments via email.

Remember my form inputs on this computer.

test outline:	Ovate	chamber arrangement:	Planispiral	edge view:	Hourglass	aperture:	Equatorial
sp chamber shape:	Inflated	coiling axis:	N/A	periphery:	N/A	aperture border:	Thin lip
umb chbr shape:	Inflated	umbilicus:	Wide	periph margin shape:	Broadly rounded	accessory apertures:	None
spiral sutures:	Moderately depressed	umb depth:	Shallow	wall texture:	Smooth	shell porosity:	-
umbilical or test sutures:	Moderately depressed	final-whorl chambers:	7.0-9.0	N.B. These characters are used for advanced search. N/A - not applicable