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Anaticinella multiloculata


Classification: pf_mesozoic -> Rotaliporidae -> Anaticinella -> Anaticinella multiloculata
Sister taxa: Anaticinella, A. multiloculata, A. planoconvexa,

Taxonomy

Citation: Anaticinella multiloculata (Morrow, 1934)
Rank: Species
Basionym: Globorotalia? multiloculata
Taxonomic discussion: This species seems to be the most primitive of the three species of Globorotalia here described from the Greenhorn formation [see also G. cushnani, G. greenhornensis]. It is evidently very close to Globigerina. Since the other two species are definitely not Globigerina, and yet all three species are obviously quite closely related, it seems best to consider this species in the same genus. There is a suggestion of the development of the keeled periphery of Globorotalia in the sharply rounded margin of the chambers appearing in edge view, about intermediate between Globorotalia greenhornensis and typical Globigerina. The similar aspect
of the ventral side in these species is also striking. G. multiloculata is quite common locally in the Greenhorn formation associated with the two species just described. It is easy to distinguish because of its numerous chambers and globigerine aspect with a narrowed periphery. [copied from Chronos database]

Type images:

Original description: Globorotalia? multiloculata Morrow 1934: Test trochoid, biconvex, compressed; dorsal side strongly convex, ventral side moderately convex; chambers numerous, seven to nine in final whorl, very distinct, inflated, narrowly rounded but not keeled at their periphery, tending in the last whorl to be produced ventrally in the direction of the axis of coiling; umbilical area large and rather deep; sutures strongly depressed; wall finely perforate.

Entries in the Catalog of original descriptions: Globorotalia multiloculata;

See also: Globorotalia greenhornensis;

Geological Range:
Last occurrence (top): within R. cushmani zone (94.03-95.94Ma, top in Cenomanian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-95.94Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

Plot of occurrence data:

NB Plotting of Neptune data has been disabled on the Mesozoic pages because the dataset is both small and badly affected by a few sites with erroneous age models (our obs Huber, Petrizzo, Young, Nov 2016). The data can still be viewed via the range plottertool - tools menu.

Character matrix

test outline:Lobatecoiling axis:Low-moderatechamber arrangement:Trochospiralumbilicus:Narrow
edge view:Planoconvexumbilical or test sutures:Moderately depressedspiral sutures:Moderately depressedshell porosity:Microperforate: <1
wall texture:Smoothaperture:Umbilicalaperture border:Thin flangeaccessory apertures:Umbilical
periphery:Single keelumb chamber shape:Trapezoidalsp chbr shape:Inflatedperiph margin shape:Narrowly rounded
umb depth:Deepdiameter mm:0.51width mm:breadth mm:0.23
final-whorl chambers:7.0-9.0

References:

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


Anaticinella multiloculata compiled by the pforams@mikrotax project team viewed: 30-5-2017

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