Nacre and false nacre (foliated aragonite) in extant monoplacophorans (=Tryblidiida: Mollusca)

@article{Checa2008NacreAF,
  title={Nacre and false nacre (foliated aragonite) in extant monoplacophorans (=Tryblidiida: Mollusca)},
  author={Antonio G. Checa and Joaquin Ramirez-Rico and Alicia Gonz{\'a}lez-Segura and Antonio S{\'a}nchez-Navas},
  journal={Naturwissenschaften},
  year={2008},
  volume={96},
  pages={111-122}
}
Extant monoplacophorans (Tryblidiida, Mollusca) have traditionally been reported as having an internal nacreous layer, thus representing the ancestral molluscan condition. The examination of this layer in three species of Neopilinidae (Rokopella euglypta, Veleropilina zografi, and Micropilina arntzi) reveals that only V. zografi secretes an internal layer of true nacre, which occupies only part of the internal shell surface. The rest of the internal surface of V. zografi and the whole internal… 
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TLDR
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References

SHOWING 1-10 OF 47 REFERENCES
Self-organisation of nacre in the shells of Pterioida (Bivalvia: Mollusca).
A new species of Monoplacophora, redescription of the genera Veleropilina and Rokopella, and new information on three species of the class
Vema levinae Warén, sp. n. is described from a submarine volcano off western Mexico. The type species of Rokopella and Veleropilina are redescribed, the usage of the names is discussed and Rokopella
Crystallographic structure of the foliated calcite of bivalves.
Laevipilina Cachuchensis, A New Neopilinid (Mollusca: Tryblidia) From Off North Spain
TLDR
A new tryblidian species, Laevipilina cachuchensis, is described from a depth of 580– 600 m on ‘El Cachucho’ Bank (Asturias, north Spain), differing mainly in shell characters and details of radular morphology.
Ultrastructural Characteristics of the Nacre in Some Gastropods
TLDR
The nacreous layer in Gibbula, Calliostoma, Trochus and Haliotis is described on the basis of scanning electron microscopic studies and the mechanical properties of the nacre, and the effects of the interlamellar conchiolin membranes upon the nucleation of the tablets are discussed.
Comparative Ultrastructure and Organization of the Prismatic Region of Two Bivalves and its Possible Relation to the Chemical Mechanism of Boring
The prismatic region of two bivalve molluscs exemplifies, in its structure and organization, one of the types of differentiated calcareous substrates through which boring organisms must penetrate.
Shell microstructures of Cambrian molluscs replicated by phosphate
The original microstructure of the aragonistic and calcite shells of Cambrian molluscs is frequently visible at high magnifications on the surfaces of phosphatic internal moulds. More rarely, the
An electron microscope study of the formation of the nacreous layer in the shell of certain bivalve molluscs
TLDR
An electron-microscopic study was made of nacreous shell growth in several species of marine molluscs, showing that the first step in crystal formation is the “polymerization” of part of the pallial fluid to form lamellae parallel to the surface of the epithelium.
Nacre Formation in Bivalve and Gastropod Molluscs
Because of the simple and regular pattern of its organic and inorganic constituents, the nacreous structure of mollusc shell has attracted many investigators for a considerable period. This
Atomic force microscopy of the nacreous layer in mollusc shells
We present atomic force microscopy (AFM) observations of the aragonite tablets of mature nacre in two types of mollusc, a bivalve (Atrina sp.) and a gastropod (Haliotis rufescens). By imaging in
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