Oolithotus fragilis

Classification: Coccolithophores -> Coccolithales -> Calcidiscaceae -> Oolithotus -> Oolithotus fragilis
Sister taxa: O. antillarum, O. fragilis, O. sp.,


Citation: Oolithotus fragilis (Lohmann 1912) Martini & Müller, 1972
Rank: Species
Basionym: Coccolithophora fragilis Lohmann 1912
Notes & discussion: Easily confused with C. leptoporus in LM. Distinction from O. antillarum was first proposed by Okada & McIntyre (1977) and is discussed further in Kleijne (1993).

Distinguishing features: liths large (>5µm), weakly asymmetric

Farinacci & Howe catalog pages: Coccolithophora fragilis * , Tergestiella calumnia *

Morphology remarks: Large form, coccoliths 5-9µm; weakly asymmetric; proximal shield only slightly smaller than distal, sutures jagged; broad depression on distal surface, distal sutures often kinked. Coccosphere often incomplete / with large opening.

Biology & life-cycles: One combination coccosphere, with holococcoliths observed in LM, but holococcoliths could not be determined (Geisen & Broerse unpubl. obs.).

Cultures: strains of this species are maintained in culture, for details see Roscoff culture collection.

Search data:
TagsLITHS: placolith, asymmetric, circular, sub-circular, CA: Placoliths: closed-----, closed,
CSPH: bowl-shaped, spherical, equant, monomorphic, V-UNITS: distal shield, tube, V-prominent, R-UNITS: prox shield, R-prominent, DETAILS: isogyres oblique, rim-unicyclic,
MetricsLith size: 5->9µm; Coccosphere size: 15->20µm; Liths per sphere: 30->60
Sources: RCC
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within Pliocene Epoch (2.59-5.33Ma, base in Zanclean 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: Oolithotus fragilis, synonyms included - Oolithotus fragilis;
  • space-time plot :: Samples map :: Parent: Oolithotus


    Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs :: ::

    Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs :: ::

    Kleijne, A. (1993b). Morphology, Taxonomy and distribution of extant coccolithophorids (Calcareous nannoplankton). Drukkerij FEBO B.V., Katwijk. 321-. gs :: ::

    Lohmann, H. (1912). Untersuchungen über das Pflanzen- und Tierleben der Hochsee, zugleich ein Bericht über die biologischen Arbeiten auf der Fahrt der "Deutschland" von Bremerhaven nach Buenos-Aires in der Zeit vom 7. Mai bis 7. September 1911. Veröffentlichungen des Instituts für Meereskunde an der Universität Berlin, Neue Folge. A. Geographisch-naturwissenschaftliche Reihe. 1: 1-92. gs :: view :: open

    Martini, E. & Müller, C. (1972). Nannoplankton aus dem nördlichen Arabischen Meer. “Meteor” Forschungsergebnisse, Reihe C, Geologie und Geophysik. 10: 63-74. gs :: ::

    Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs :: ::

    Reid, F. M. H. (1980). Coccolithophorids of the North Pacific Central Gyre with notes on their vertical and seasonal distribution. Micropaleontology. 26(2): 151-176. gs :: ::

    Schiller, J. (1930). Coccolithineae. In, Rabenhorst, L. (ed.) Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. Akademische Verlagsgesellschaft, Leipzig 89-267. gs :: ::

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

    Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research, Special Issue. 1: 1-132. gs :: view :: open


    Oolithotus fragilis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-8-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=958 Go to Archive.is to create a permanent copy of this page - citation notes

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