Amaurolithus delicatus


Classification: ntax_cenozoic -> 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
Synonyms: Ceratolithus perch-nielseniae Guptha 1979
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.

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

Farinacci & Howe catalog pages: A. delicatus * , A. ninae * , C. perch-nielsenae *

Search data:
TagsLITHS: nannolith-other, asymmetric, horseshoe-shaped, CROSS-POLARS: 1ou, V-prominent,
MetricsLith size: 6->10µm; Segments: 1->1;
Data source notes: 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:

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 V O

de Kaenel, E. & Villa, G. (1996). Oligocene-Miocene calcareous nannofossil biostratigraphy and paleoeecology from the Iberian Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 79-145. gs V O

Gartner, S. & Bukry, D. (1975). Morphology and phylogeny of the coccolithophycean family Ceratolithaceae. Journal of Research of the U.S. 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

Müller, C. (1974b). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs V O

Perch-Nielsen, K. (1977a). 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 V O

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

Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs V O

Wei, W. (2003). Upper Miocene nannofossil bistratigraphy and taxonomy of Exxon core CH30-43-2 from the Gulf of Mexico. Journal of Nannoplankton Research. 25(1): 17-23. gs V O

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


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Amaurolithus delicatus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-12-2020

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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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