Amaurolithus delicatus

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

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


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

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

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

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


    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., 4th International Palynological Conference, Lucknow, pp. 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. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 225-265. GS


    Amaurolithus delicatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-5-2019

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    Short stable page link: Go to to create a permanent copy of this page - citation notes

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