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Laeviheterohelix dentata


Classification: pf_mesozoic -> Heterohelicidae -> Laeviheterohelix -> Laeviheterohelix dentata
Sister taxa: L. dentata, L. flabelliformis, L. glabrans, L. pulchra, L. reniformis, L. turgida, L. sp.

Taxonomy

Citation: Laeviheterohelix dentata (Stenestad, 1968)
Rank: Species
Basionym: Heterohelix dentata
Variants: vv

Type images:

Original description: Test with initial small-sized planispiral coil or more often biserial throughout. Chambers reniform increase rapidly in size as added. Sutures distinct, depressed and curced. Test compressed with subangular to angular periphery. No peripheral structures present. Test wall smooth, finely perforated. Scattered pustules can be recorded on the earlier formed chambers, the last formed ones being invariably smooth. Aperture a moderate high arch at the base of the apertural face is bordered by thin flanges.

Entries in the Catalog of original descriptions: Heterohelix dentata

Most likely ancestor: Laeviheterohelix pulchra - at confidence level 3 (out of 5). Data source: Nederbragt 1991.

Geological Range:
Last occurrence (top): within A. mayaroensis zone (67.30-69.18Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. havanensis zone (74.00-75.71Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix

test outline:Subtriangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Petaloidcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
umb chbr shape:Petaloidumbilicus:N/Aperiph margin shape:Narrowly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:N/Awall texture:Smoothshell porosity:-
umbilical or test sutures:Moderately depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Nederbragt, A. J. (1991). Late Cretaceous biostratigraphy and development of Heterohelicidae (planktic foraminifera). Micropaleontology. 37: 329-372. gs

Stenestad, E. (1968). Three new species of Heterohelix Ehrenberg from the upper Senonian of Denmark. Meddelelser fra Dansk Geologisk Forening. 18(1): 64-70. gs


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Laeviheterohelix dentata compiled by the pforams@mikrotax project team viewed: 7-3-2021

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110301 Go to Archive.is to create a permanent copy of this page - citation notes



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