Amaurolithus delicatus


Classification: Coccolithophores -> Nannolith families inc sed -> Ceratolithaceae -> Amaurolithus -> Amaurolithus delicatus
Sister taxa: A. brevigracilis, A. delicatus, A. primus, A. tricorniculatus, A. sp.,

Taxonomy:

Citation: Amaurolithus delicatus Gartner and Bukry, 1975
Rank: Species
Variants: A. ninae Perch-Nielsen, 1977 - like A. delicatus but with well developed apical region. Blair et al. (2017) record a few specimens but did not find any stratigraphic value to making the separation.
Synonyms: Ceratolithus perch-nielseniae Guptha 1979

Distinguishing features: Simple horseshoe-shaped amauroliths. Grades into the other morphotypes, especially A. primus and A. tricorniculatus.

Farinacci & Howe catalog pages: Amaurolithus delicatus * , Amaurolithus ninae * , Ceratolithus perch-nielsenae * , ,

Search data:
TagsLITHS: nannolith-other, horseshoe-shaped, RIM: spine(s),
CSPH: not known, V-UNITS: all, DETAILS: 1ou,
MetricsLith size: 6->10µm; Segments: 1->1;
Sources: lith width from illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of NN14 zone (100% up, 3.9Ma, in Zanclean stage). Data source: zonal marker, with A. tricorniculatus, (see e.g. Young 1998)
First occurrence (base): within NN11b subzone (6.91-7.42Ma, base in Tortonian stage). Data source: Young 1998

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: Amaurolithus delicatus, synonyms included - Amaurolithus delicatus; Amaurolithus ninae; Ceratolithus delicatus; space-time plot :: Samples map :: Parent: Amaurolithus

    References:

    Blair, S. A., Bergen, J. A., de Kaenel, E., Browning, E. & Boesiger, T. M. (2017). Upper Miocene-Lower Pliocene taxonomy and stratigraphy in the circum North Atlantic Basin: radiation and extinction of Amauroliths, Ceratoliths and the D. quinqueramus lineage. Journal of Nannoplankton Research. 37(2-3): 113-144. gs

    Gartner, S. & Bukry, D. (1975). Morphology and phylogeny of the coccolithophycean family Ceratolithaceae. Journal of Research of the United States Geological Survey.. 3: 451-465. gs

    Guptha, M. V. S. (1979). New genus and new species of coccoliths in a deep sea sediment core from South Eastern Arabian Sea. In, unknown (ed.) 4th International Palynological Conference, Lucknow. 115-116. gs

    Perch-Nielsen, K. (1977). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs

    Raffi, I., Backman, J. & Rio, D. (1998). Evolutionary trends of tropical calcareous nannofossils in the late Neogene. Marine Micropaleontology. 35(1): 17-41. gs

    Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs


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    Amaurolithus delicatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-7-2019

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=41 Go to Archive.is to create a permanent copy of this page - citation notes



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