Terminology, Nomenclature, and Systematics of the Coccolithophoridae

Braarud, Trygve; Deflandre, Georges; Halldal, Per; Kamptner, Erwin

doi:10.2307/1484169

Cited by 36 publications

(17 citation statements)

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“…tentatively by Braarud et al (1955) and Halldal & Markali (1955), the motile Crystallolithus phase would be placed in the section with holococcoliths and the non-motile phase in the section with heterococcoliths. It appears, therefore, that a coccolithophorid, which produces two morphological types of coccolith, cannot be placed satisfactorily in the present systems adopted for the classification of the Coccolithophoridae, and so these systems need revision.…”

Section: Phases In Life History Of Coccol/thusmentioning

confidence: 93%

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The motile (Crystallolithus hyalinus Gaarder & Markali) and non-motile phases in the life history of Coccolithus pelagicus (Wallich) Schiller

1960

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A new coccolithophorid, Crystallolitkus hyalinus, was described with the help of electron micrographs by Gaarder & Markali in 1956 from preserved material in which the cells lacked the appendages. From temporary cultures set up from our September 1957 sea-water samples a coccolithophorid was isolated which appeared, under the light microscope, very similar to this newly described coccolithophorid but which possessed, as does the genus Chrysochromulina, a coning haptonema in addition to the two flagella. Electron micrographs, taken for us by Prof. I. Manton, have shown that the holococcoliths from our organism are identical in structure with those from the Crystallolithus hyalinus (cf. PL I, and Gaarder and Markali, 1956, pi. I).

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Section: Phases In Life History Of Coccol/thusmentioning

confidence: 93%

“…The finding of two distinct structural types of coccoliths (see Braarud, Deflandre, Halldal & Kamptner, 1955;Halldal & Markali, 1955;Kamptner, 1958) in the life history of one coccolithophorid will necessitate a complete reassessment of the problems connected with the classification of the Coccolithophoridae.…”

mentioning

confidence: 99%

The motile (Crystallolithus hyalinus Gaarder & Markali) and non-motile phases in the life history of Coccolithus pelagicus (Wallich) Schiller

1960

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“…These are divided into two fundamentally different kinds: holococcoliths and heterococcoliths (Braarud et al 1955;Young et al 1999). The holococcoliths consist of a large number of miniscule, equant calcite crystals held together by organic material and are only rarely preserved in the fossil record.…”

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confidence: 99%

Coccolith biomineralisation studied with atomic force microscopy

Henriksen¹,

Young²,

Bown³

et al. 2004

Palaeontology

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ABSTRACT. Biomineralisation can only be understood as an interplay between organic and mineral phases. With this objective, we conducted an investigation of coccoliths using atomic force microscopy (AFM), an ultra-high resolution technique that requires no surface coating and can be used in air or under solution at ambient conditions of temperature and pressure. The detailed morphology, crystal structure, organic scales and organic coating of the coccolith species Coccolithus pelagicus, Helicosphaera carteri and Oolithotus fragilis were investigated. The ®ne structure of coccoliths is very complex, with the calcite either being smooth, dominated by steps or tuberculate; organic cover can be either granular or ®brous. Behaviour of coccolith surfaces during dissolution is in¯uenced both by mineral and organic material and different surface types show variable resistance to dissolution. The organic coating protects element faces against etching. Through atomic resolution AFM, it is possible to establish the crystallographic structure of the distal shields of C. pelagicus and O. fragilis. Though elements of both species are dominated by stable crystal faces, there are important differences between them, with the external edge of elements being parallel to a cleavage direction in C. pelagicus but parallel to the atomic rows in O. fragilis. Thus, there is evidence that the biomineralisation of each species, and also of select areas of coccoliths of the same species, is markedly different.

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“…Cocolitos em forma helicoidal, representantes do gênero Helicosphaera. Heterococolito - Braarud, T. et al (1955). Um cocolito construído de elementos diferentes.…”

Section: Glossário Da Terminologia Morfológicaunclassified

Nanofósseis Calcários Quaternários da Bacia de Campos, Brasil Sistemática e Diagênese Primária

2002

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The analyses of five piston cores (SG91-09/PC-01, SG91-14/PC-04, SG91-14/PC-06, SG91-14/PC08 e SG91- 14/PC09) sampled on Campos Basin - RJ, Brazil, permitted the systematic studies in Quaternary calcareous nannofossils and the description of the primary diagenesis effects on this microfossils using optical microscope and scanning electron microscope. The observation of “in situ” dissolution and reprecipitation of calcium carbonate recorded limitate the systematic studies of calcareous nannofossils and show the importance to use both optical and scaning microscope.

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Terminology, Nomenclature, and Systematics of the Coccolithophoridae

Cited by 36 publications

References 0 publications

The motile (Crystallolithus hyalinus Gaarder & Markali) and non-motile phases in the life history of Coccolithus pelagicus (Wallich) Schiller

The motile (Crystallolithus hyalinus Gaarder & Markali) and non-motile phases in the life history of Coccolithus pelagicus (Wallich) Schiller

Coccolith biomineralisation studied with atomic force microscopy

Nanofósseis Calcários Quaternários da Bacia de Campos, Brasil Sistemática e Diagênese Primária

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