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pforams@mikrotax - Marginotruncana manaurensis pforams@mikrotax - Marginotruncana manaurensis

Marginotruncana manaurensis


Classification: pf_mesozoic -> Globotruncanidae -> Marginotruncana -> Marginotruncana manaurensis
Sister taxa: M. angusticarenata, M. caronae, M. coronata, M. desioi, M. manaurensis, M. marginata, M. paraconcavata, M. pileoliformis, M. pseudolinneiana, M. renzi, M. schneegansi, M. sigali, M. sigmoconcavata, M. sinuosa, M. tarfayaensis, M. undulata, M. sp.

Taxonomy

Citation: Marginotruncana manaurensis (Gandolfi 1955)
Taxonomic rank: species
Basionym: Globotruncana fornicata manaurensis Gandolfi, 1955

Type images:

Original description: Test convex on the dorsal side, double-keeled, subcircular with a narrow peripheral band; the second keel only slightly shifted toward the umbilicus; chambers becoming long, arched, elongated in the adult stage, sutural elevations thinner than in Glt. lapparenti lapparenti, but continuously raised on the umbilical side, running with sigmoidal development, but bending sharply back and tending to attach themselves to the previous ones. The last ones sometimes still plunge within the umbilical cavity. The test is generally smooth; the umbilical cavity is large with thin, long, nearly straight apertural lips. The specimens investigated are dextrally coiling.

Entries in the Catalog of original descriptions: Globotruncana fornicata manaurensis

Character matrix
test outline:Circularchamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical
sp chamber shape:Crescenticcoiling axis:Lowperiphery:Double keelaperture border:Thin lip
umb chbr shape:Crescenticumbilicus:Wideperiph margin shape:Subangularaccessory apertures:None
spiral sutures:Raisedumb depth:Shallowwall texture:Finely muricateshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Raised beadedfinal-whorl chambers:5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source:
First occurrence (base): within M. schneegansi zone (89.75-92.51Ma, base in Turonian stage). Data source:

Plot of range and occurrence data:

References:

Gandolfi, R. (1955). The genus Globotruncana in northeastern Colombia. Bulletins of American Paleontology. 36: 1-118. gs


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Marginotruncana manaurensis compiled by the pforams@mikrotax project team viewed: 25-4-2025

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Short stable page link: https://mikrotax.org/pforams/index.php?id=110586 Go to Archive.is to create a permanent copy of this page - citation notes



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Comments (2)

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Citation: Marginotruncana manaurensis Gandolfi 1955 brackets missing

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corrected, thanks