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Thalmanninella micheli


Classification: pf_mesozoic -> Rotaliporidae -> Thalmanninella -> Thalmanninella micheli
Sister taxa: T. appenninica, T. balernaensis, T. brotzeni, T. deeckei, T. evoluta, T. gandolfii, T. globotruncanoides, T. greenhornensis, T. micheli, T. praebalernaensis, T. reicheli, T. sp.

Taxonomy

Citation: Thalmanninella micheli (Sacal and Debourle, 1957)
Rank: Species
Basionym: Globotruncana (Rotalipora) micheli
Synonyms: Rotalipora appenninica marchigiana
Taxonomic discussion: Considered transitional between R. appenninica and R. reicheli [copied from Chronos database]

Type images:

Original description: Translated from French: Shell planoconvex, consisting of 6 to 7 chambers in the last whorl, separated by arched sutures pointing backward, the chambers on the ventral side are equally convex, separated by slightly curved sutures. Intrasutural apertures not clearly visible, mostly filled with foreign material; however, the aperture of the apertural side of the last chamber is often fairly visible. The species is characterized by rapidly increasing chambers. The sections made from loose specimens (fig. 12) show that the species is strongly related to Globotruncana apenninica Renz. The first whorls display the shape of this latter species.

Entries in the Catalog of original descriptions: Globotruncana (Rotalipora) micheli, Rotalipora appenninica marchigiana

Geological Range:
Last occurrence (top): within T. reicheli zone (95.94-96.08Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within P. appenninica zone (100.50-101.92Ma, base in Albian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix

test outline:Circularchamber arrangement:Trochospiraledge view:Planoconvexaperture:Extraumbilical
sp chamber shape:Petaloidcoiling axis:Very lowperiphery:Single keelaperture border:Thin lip
umb chbr shape:Globularumbilicus:Narrowperiph margin shape:Subangularaccessory apertures:Umbilical
spiral sutures:Raisedumb depth:Deepwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:5.0-6.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

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

Sacal, V. & Debourle, A. (1957). Foraminiferes d'Aquitaine; 2e partie, Peneroplidae a Victoriellidae. Mémoires de la Société Géologique de France. 78: 1-88. gs


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Thalmanninella micheli compiled by the pforams@mikrotax project team viewed: 25-11-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110548 Go to Archive.is to create a permanent copy of this page - citation notes



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