Nannoconus colomii


Classification: Mesozoic -> Braarudosphaerales -> Nannoconaceae -> Nannoconus -> N. kamptneri group -> Nannoconus colomii
Sister taxa: N. aquitanicus, N. boletus, N. bonetii, N. bronnimannii, N. bucheri, N. calpidomorphus, N. colomii, N. dauvillieri, N. dislocatus, N. globulus, N. kamptneri, N. oviformis, N. vocontiensis, N. wassallii, N. wintereri,

Distinguishing features: Bulbous basal cavity.


Taxonomy:

Citation: Nannoconus colomi (de Lapparent 1931) Kamptner 1938
Rank: Species
Basionym: Lagena colomi de Lapparent 1931
Notes & discussion: Lagena colomii de Lapparent 1931 and Nannoconus steinmanni Kamptner 1931 were the first two Nannoconus species to be described, and both are largish tapering nannoconids.  However, Bronnimann (1955) argued that they are not synonyms but discrete species with N. colomii having a central cavity which is wider at the base. Following this most authors have used N. steinmanni as the name for the typical, abundant form, and there seem to be few records of N. colomii sensu Bronnimann. Some other authors, however, notably Thierstein (1973) still regarded N. colomii as a senior synonym of N. steinmannii, so most records of N. colomii in the literaure are probably of forms which would be included in N. steinmannii by most modern workers.

Farinacci & Howe catalog pages: Lagena colomi *

Distinguishing features: Bulbous basal cavity.

Geological Range:
Last occurrence (top): within Barremian Stage (126.30-130.77Ma, top in Barremian stage). Data source: Perch-Nielsen 1985
First occurrence (base): within Tithonian Stage (145.01-152.06Ma, base in Tithonian stage). Data source: Perch-Nielsen 1985

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Nannoconus colomii, synonyms included - Nannoconus colomii;
  • space-time plot :: Samples map :: Parent: N. kamptneri group

    References:

    Brönnimann, P. (1955). Microfossils incertae sedis from the Upper Jurassic and Lower Cretaceous of Cuba. Micropaleontology. 1(28-51): -. gs

    de Lapparent, J. (1931). Sur les prétendus "embryons" de Lagena. Compte Rendue Sommaire de la Société Géologique de France. 15: 222-223. gs

    Kamptner, E. (1931). Nannoconus steinmanni novo gen., novo spec., ein merkwurdiges gesteinbildendes Mikrofossil aus dem jungeren Mesozoikum der Alpen. Paläontologische Zeitschrift. 13: 288-298. gs

    Thierstein, H. R. (1973). Lower cretaceous calcareous nannoplankton biostratigraphy. Abhandlungen der Geologischen Bundesanstalt. 29: 3-52. gs

    Wind, F. H. & Cepek, P. (1979). Lower Cretaceous calcareous nannoplankton from DSDP Hole 397A (northwest African Margin). Initial Reports of the Deep Sea Drilling Project. 47A: 221-235. gs


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    Nannoconus colomii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-12-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10734 Go to Archive.is to create a permanent copy of this page - citation notes



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