Methodes de discrimination appliquees a des populations de Sellithyridinae (Brachiopodes) du Cenomanien d'Europe occidentale

Gaspard, D.; Mulloni, C.

doi:10.2113/gssgfbull.s7-xxv.5.679

Bulletin De La Société Géologique De France

1983

DOI: 10.2113/gssgfbull.s7-xxv.5.679

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Methodes de discrimination appliquees a des populations de Sellithyridinae (Brachiopodes) du Cenomanien d'Europe occidentale

D. Gaspard¹,

C. Mulloni²

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Cited by 4 publications

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“…Following the work of Williams, it became obvious that SEM is an appropriate tool to study brachiopod biomineralisation processes. This appealing approach guided the career of one of the present authors (Gaspard 1972(Gaspard , 1978(Gaspard , 1986(Gaspard , 1988. In particular, Gaspard (1991) found that the elementary carbonate secretion units are sub-micrometric granules.…”

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confidence: 84%

Shell matrices of Recent rhynchonelliform brachiopods: microstructures and glycosylation studies

Gaspard¹,

Marin²,

Guichard³

et al. 2007

Earth and Environmental Science Transactions of the Royal Socie

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Like most metazoan biomineralisations, the brachiopod shell is the end product of a biologically controlled calcification process. The main agent of the control is the extracellular matrix, which is secreted by the outer mantle epithelium. This matrix mediates the calcification process by allowing crystal nucleation and elongation in specific orientations and finally, by stopping crystal growth. The proteinaceous moiety of brachiopod shell matrices has been extensively studied. Less known are the post-translational modifications that occur in these matrices, in particular glycosylations. In this comparison of five species of Recent articulated brachiopods, the ratio of soluble to insoluble organic matrix varies between the species. Polydisperse macromolecular materials occur in each of these species with discrete proteins of 50 kDa in Notosaria nigricans, Calloria inconspicua and Neothyris lenticularis, 37 kDa in Terebratulina retusa and Gryphus vitreus and 20–25 kDa in N. nigricans. Protein mixtures from all five species respond differently to anionic stains (Stains-All and Alcian Blue). PAS staining results in a positive smear in C. inconspicua and T. retusa and highlights low molecular weight glycoproteins in C. inconspicua. The polysaccharide composition of the soluble matrix of T. retusa is different from the others due to high proportions of arabinose and low proportions of fucose. In all cases, polysaccharide composition of the insoluble matrix is dominated by glucose and glucosamine. Insoluble matrices have more glucose and xylose and less galactosamine and glucosamine than the corresponding soluble matrix. Relatively high amounts of glucosamine may suggest the presence of chitin in the shell matrix of rhynchonelliform brachiopods.

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mentioning

confidence: 84%

Shell matrices of Recent rhynchonelliform brachiopods: microstructures and glycosylation studies

Gaspard¹,

Marin²,

Guichard³

et al. 2007

Earth and Environmental Science Transactions of the Royal Socie

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Early Cretaceous (Valanginian) brachiopods from the Rosablanca Formation, Colombia, South America: Biostratigraphic significance and paleogeographic implications

Rojas

Sandy

2019

Cretaceous Research

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Brachiopods from the Albian–Cenomanian transition (Cretaceous) of the Eastern Prebetic (South-Iberian paleomargin)

Baeza-Carratalá

Berrocal-Casero

Joral

2023

Cretaceous Research

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Methodes de discrimination appliquees a des populations de Sellithyridinae (Brachiopodes) du Cenomanien d'Europe occidentale

Cited by 4 publications

References 0 publications

Shell matrices of Recent rhynchonelliform brachiopods: microstructures and glycosylation studies

Shell matrices of Recent rhynchonelliform brachiopods: microstructures and glycosylation studies

Early Cretaceous (Valanginian) brachiopods from the Rosablanca Formation, Colombia, South America: Biostratigraphic significance and paleogeographic implications

Brachiopods from the Albian–Cenomanian transition (Cretaceous) of the Eastern Prebetic (South-Iberian paleomargin)

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