N. infans group


Ancestry: Mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. infans group
Sister taxa: N. steinmannii group, N. kamptneri group, N. abundans group, N. truitti group, N. circularis group, N. infans group, Nannoconus - atypical, N. sp.,

Short diagnosis: Relatively small (<~5µm), subcircular, elliptical or cylindrical nannoconids with relatively narrow canals (ct < wt).


Daughter taxa (blue => in age window 0-300Ma)
Rectangular to oval with narrow canal
Cylindrical to barrel-shaped with moderately broad canal (similar to its wall thickness).
small, square, rectangular or oval with narrow canal.
Elliptical to subcircular with relatively narrow canal (less than wall thickness).

Taxonomy:

Citation: N. infans group
Rank: species group
Notes & discussion: informal grouping first used here

Farinacci & Howe catalog pages: N. infans group [no catalog entry yet]

Short diagnosis: Relatively small (<~5µm), subcircular, elliptical or cylindrical nannoconids with relatively narrow canals (ct < wt).

Geological Range:
Last occurrence (top): within Berriasian Stage (139.39-145.01Ma, top in Berriasian stage). Data source: Total of range of species in this database
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Casellato, C.E., (2010). Calcareous nannofossil biostratigraphy of Upper Callovian - Lower Berriasian successions from the Souhern Alps, North Italy. Rivista Italiana di Paleontologia e Stratigrafia, 116(3): 357-404.


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N. infans group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-10-2017

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Comments (1)

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Cristina Casellato (Università degli Studi di Milano, Italy)
Hello,
I just want to correct the name: Casellato, not Casselato.
my best regards
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Jeremy Young (UCL, UK)
OK - I have corrected that now and also on a couple of other pages. To heck this you can use the google search box on the search page which allows you to check quickly for everywhere a name occurred on the site the last itme google checked it.
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