pforams@mikrotax - Laeviella bentonensis

Laeviella bentonensis


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

Taxonomy

Citation: Laeviella bentonensis (Morrow, 1934)
Rank: species
Basionym: Anomalina bentonensis
Synonyms:
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:

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:

Character matrix
test outline:Ovatechamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Inflatedumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:-
umbilical or test sutures:Moderately depressedfinal-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


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

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