Noelaerhabdaceae


Ancestry: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae
Sister taxa: Noelaerhabdaceae, Prinsiaceae, Isochrysidaceae,

Short diagnosis: Heterococcoliths with Reticulofenestra-type structure, V-units vestigal, R-units forming grill, both shields, and two-layered tube


Daughter taxa (blue => in age window 0-300Ma) Granddaughter taxa
With ring of short spines extending from inner tube

No bridge, slits between distal shield elements

Bridge across the central area

With slits between some of the distal shield elements

No bridge, no slits

With one large spine extending from inner tube

Spurious genus for reticulofenestrid coccoliths without shields

Taxonomy:

Citation: Noelaerhabdaceae Jerkovic, 1970 emend. Young & Bown, 1997
Rank: Family
Synonyms: Gephyrocapsaceae Black, 1971
Notes & discussion: The phrase "Noelaerhabdaceaen coccoliths" is ugly and many workers have used alternatives. I reccomend using "reticulofenestrid coccolith" since these all have the same basic structure as Reticulofenestra. Phrases such as "small placoliths" are misleading since unrelated coccolithophores such as Umbilicosphaera produce equally small placoliths.

Farinacci & Howe catalog pages:

Short diagnosis: Heterococcoliths with Reticulofenestra-type structure, V-units vestigal, R-units forming grill, both shields, and two-layered tube


Morphology remarks: Coccoliths are placoliths with Reticulofenestra-type structure, i.e. V-unit vestigial, R-unit forms proximal shield, distal shield, inner and outer tube-cycles, grill and any central-area structures; strongly birefringent. In the SEM characteristic features include; grill in central area, anti-clockwise imbrication of inner tube elements, and monocyclic proximal shield. References: Young (1989), Young et al. (2004).

Biology & life-cycles: Emiliania huxleyi and Gephyrocapsa oceanica have been cultured extensively and their life-cycle is well worked out (Klaveness 1972, Green et al 1996, Houdan et al. 2004, Frada et al. 2009). The dominant phase is diploid, non-motile and usually heterococcolith-bearing (= C-cells), although naked mutants often occur in culture (= N-cells). The alternate phase is haploid, scale-bearing and motile (= S-cells). There is no holococcolith stage.

Geological Range:
Notes: : The Noelaerhabdaceae dominate most Neogene nannofossil assemblages with the dominant genera being succesively Cyclicargolithus (NN1-6), Reticulofenestra (NN6-16), Pseudoemiliania (NN16-19), Gephyrocapsa (NN19-20) and Emiliania (NN21). The last occurrences of various larger forms provide excellent highly synchronous biostatigraphic events - particularly LO large R. pseudoumbilicus (end NN10A), LO R. pseudoumbilicus (end NN15), LO large Gephyrocapsa (NN19), LO P. pseudoemiliania (end NN19).
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): within Thanetian Stage (55.96-59.24Ma, base in Thanetian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Black, M., (1971). The systematics of coccoliths in relation to the paleontological record. In: Funnell, B.M. and Riedel, W.R. (Editors), The Micropaleontology of the Oceans. Cambridge University Press, Cambridge, pp. 611-624.

Frada, M.; Probert, I.; Allen, M.J.; Wilson, W.H. & de Vargas, C., (2009). The “Cheshire Cat” escape strategy of the coccolithophore Emiliania huxleyi in response to viral infection. Proceedings of the National Academy of Science, 105(41): 15944-15949.

Gallagher, L.T., (1989). Reticulofenestra : A critical review of taxonomy, structure and evolution. In: Crux, J.A. and Heck, S.E.v. (Editors), Nannofosils and their applications. Ellis Horwood, Chichester, pp. 41-75.

Green, J.C.; Course, P.A. & Tarran, G.A., (1996). The life-cycle of Emiliania huxleyi: A brief review and a study of relative ploidy levels analysed by flow cytometry. Journal of Marine Systems, 9: 33-44.

Houdan, A.; Billard, C.; Marie, D.; Not, F.; Sáez, A.G.; Young, J.R. & Probert, I., (2004). Flow cytometric analysis of relative ploidy levels in holococcolithophore-heterococcolithophore (Haptophyta) life cycles. Systematics and Biodiversity, 1(4): 453-465.

Jerkovic, L., (1970). Noëlaerhabdus nov. gen. type d'un nouvelle famille de Coccolithophoridés fossiles: Noëlaerhabdaceae du Miocène supérieur de Yugoslavie. Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences. Paris. Série D - Sciences Naturelles, 270: 468-470.

Klaveness, D., (1972). Coccolithus huxleyi (Lohmann) Kamptner. II. - The flagellate cell, aberrant cell types, vegetative propagation and life cycles. British Phycological Journal, 7: 309-318.

Young, J.R. & Bown, P.R., (1997). Cenozoic calcareous nannoplankton classification. Journal of Nannoplankton Research, 19(1): 36-47.

Young, J.R., (1989). Observations on heterococcolith rim structure and its relationship to developmental processes. In: Crux, J.A. and Heck, S.E.v. (Editors), Nannofossils and their applications. Ellis Horwood, Chichester, pp. 1-20.

Young, J.R.; Henriksen, K. & Probert, I., (2004). Structure and morphogenesis of the coccoliths of the CODENET species. In: Thierstein, H.R. and Young, J.R. (Editors), Coccolithophores - From molecular processes to global impact. Springer, pp. 191-216.


Nannotax3 - Coccolithophores - Noelaerhabdaceae by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-6-2017

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AphiaID: 146200 Nomenclatural data on WoRMS

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