nmn

Pseudothalmanninella tehamaensis


Classification: pf_mesozoic -> Rotaliporidae -> Pseudothalmanninella -> Pseudothalmanninella tehamaensis
Sister taxa: P. klausi, P. subticinensis, P. tehamaensis, P. ticinensis, P. sp.

Taxonomy

Citation: Pseudothalmanninella tehamaensis (Marianos and Zingula, 1966)
Rank: Species
Basionym: Rotalipora tehamaensis
Taxonomic discussion: bad holotype image on online E+M catalogue. [copied from Chronos database]

Type images:

Original description: Diagnosis. - Test trochoid, biconvex, nearly circular, periphery only weakly lobate, single-keeled; chambers compressed, thickest at the umbilicus, early chambers of last whorl pustulose, later ones smooth, six to eight in last whorl, increasing slowly in size, normally overlapping dorsally; dorsal sutures curved, raised and thickened, curved back at the periphery forming a keel; ventral sutures radial, depressed near outer edge, becoming raised and thickened near umbilicus, and in some specimens having a thickened ridge around the umbilicus connecting adjacent sutures; umbilicus narrow, deep; primary aperture a high umbilical-extraumbilical arch showing a lip; one secondary aperture, having a lip, per suture in the umbilicus. Dimensions: Greatest diameter of holotype 0.34 mm.; least diameter 0.30 mm; thickness 0.16 mm.

Entries in the Catalog of original descriptions: Rotalipora tehamaensis

Geological Range:
Last occurrence (top): within T. globotruncanoides zone (96.08-100.50Ma, 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:Subcircularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Crescenticcoiling axis:Moderateperiphery:Single keelaperture border:Thin lip
umb chbr shape:Crescenticumbilicus:Narrowperiph margin shape:Narrowly roundedaccessory apertures:Umbilical
spiral sutures:Raised beadedumb depth:Deepwall texture:Mod. Pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6.0-8.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Marianos, A. W. & Zingula, R. P. (1966). Cretaceous planktonic foraminifers from Dry Creek, Tehama County, California. Journal of Paleontology. 40: 328-343. gs

Petrizzo, M. R., Caron, M. & Premoli Silva, I (2015). Remarks on the identification of the Albian/Cenomanian boundary and taxonomic clarification of the planktonic foraminifera index species globotruncanoides, brotzeni and tehamaensis. Geological Magazine. 152(3): 521-536. gs


logo

Pseudothalmanninella tehamaensis compiled by the pforams@mikrotax project team viewed: 23-11-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/pforams/index.php?id=110477 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
Captcha Image
Powered by Commentics