Nannotax3 - Mesozoic - N. compressus group

N. compressus group

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

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

Daughter taxa: (blue => in age window 0-800Ma)
				Nannoconus compressus Rectangular to oval with narrow canal
				Nannoconus puer 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. The species N. erbae and N. infans were placed in this group but are now considered to belong to Polycostella, following Varol & Bowman (2019).

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

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

Geological Range:
Last occurrence (top): at top of Berriasian Stage (100% up, 139.4Ma, in Berriasian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Tithonian Stage (0% up, 152.1Ma, in Tithonian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Nannoconus

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. gs

Varol, O. & Bowman, A. R. (2019). Taxonomic revision of selected Late Jurassic (Tithonian) calcareous nannofossils and the application of mobile mounting. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 291: 65-87. gs

N. compressus group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-9-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10713 Go to Archive.is to create a permanent copy of this page - citation notes

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

9th May 2014 7:30am

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.

9th May 2014 10:33am

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