Internal Microstructure of the Shell of Bivalve Molluscs

Kobayashi, Ichiro

doi:10.1093/icb/9.3.663

Cited by 60 publications

(45 citation statements)

References 8 publications

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“…BØGGILD (1930) categorized them as normal, complex, and compound prismatic structures. KOBAYASHI (1969KOBAYASHI ( , 1971) defined them as prismatic structures and fibrous prismatic structures. In fact and according to the classification of UBUKATA (1994) A. trapesialis and A. elongatus present composite aragonitic prisms that are encapsulated by a surrounding organic matrix (KOBAYASHI 1969(KOBAYASHI , 1971.…”

Section: Discussionmentioning

confidence: 99%

“…KOBAYASHI (1969KOBAYASHI ( , 1971) defined them as prismatic structures and fibrous prismatic structures. In fact and according to the classification of UBUKATA (1994) A. trapesialis and A. elongatus present composite aragonitic prisms that are encapsulated by a surrounding organic matrix (KOBAYASHI 1969(KOBAYASHI , 1971. WILBUR & SALEUDDIN (1983) explained that this organic matrix, in addition to the attributes mentioned earlier, also has the function of crystal to crystal adherence, constructing a unified structure.…”

Section: Discussionmentioning

confidence: 99%

“…Below the periostracum is the prismatic layer, consisting of considerably elongated and juxtaposed prisms, and the nacreous layer, consisting of the deposition of horizontal lamellar plates. Using light and scanning electron microscopy, KOBAYASHI (1969KOBAYASHI ( , 1971 detected 11 different basic types of aggregation of the elements that form the calcareous part of the shell of bivalves. A crystallographic characterization of mollusk shells was published by CARTER (1990 a, b) who described and illustrated patterns of the organization of the periostracum and of the calcareous structures of various groups.…”

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confidence: 99%

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Ultrastructural analysis of the shells of Anodontites trapesialis (Lamarck) and Anodontites elongatus (Swaison) (Mollusca, Bivalvia, Etherioidea) from the Mato Grosso Pantanal Region, Brazil

Callil

Mansur

2005

Rev. Bras. Zool.

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ABSTRACT. Based on optical and SEM microscopic observations, the projections of the outer surface of the periostracum and inner micro-structures of the shell are described and redefined. The outer surface of the periostracum is practically smooth in both species. Considering a mesoscopic view of the periostracum, A. trapesialis (Lamarck, 1819) presents regular corrugations in the form of radial sequences of arches on the disk region, isolated rays or horizontal sequences of rays on the anterior lower region. A. elongatus presents corrugations formed by series of oblique arches on the disc and oblique rays on the carina. Under SEM, micro ridges were more evident in A. elongatus, but a wide diversity of shapes and patterns of micro fringes were observed in A. trapesialis, especially in young individuals. Considering the profile of the shell layers, the periostracum is relatively thin and apparently simple in A. trapesialis and thinner in A. elongatus. The prismatic layer is thick in both species, consisting of a single series of elongated prisms and wedge-shaped prisms close to the outer surface. The nacreous layer consists of very fine lamellae without pattern or with a slight staircase-like; in A. elongatus this layer is divided by a laminar inclusion of conchiolin. The fringes are abundant and diversified in A. trapesialis, a species less resistant to desiccation due to the presence of a wide intervalvar gap. The existence of a greater density of micro fringes and spikes in juveniles may be related to the orientation of the animal in order to search for an ideal site for development or for escape from regions subject to seasonal droughts, like Pantanal. KEY WORDS. Mycetopodidae, periostracum projections, shell layers.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Ultrastructural analysis of the shells of Anodontites trapesialis (Lamarck) and Anodontites elongatus (Swaison) (Mollusca, Bivalvia, Etherioidea) from the Mato Grosso Pantanal Region, Brazil

Callil

Mansur

2005

Rev. Bras. Zool.

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“…However, Boggild [1] and Taylor et al [2] have shown that the mineralogy and the arrangement of the shell layers (microstructure) are related to taxonomy. Detailed works have confirmed the potential use of microstructures for taxonomy and phylogeny [3,4]. Among the various layers known in mollusk shells, some have complex 3D arrangements (crossed lamellar layers), whereas others are simple (prism, nacre).…”

Section: Introductionmentioning

confidence: 98%

Fits and Misfits in Organic Matrix Analyses: Case of the Soluble Matrices of the Nacreous Layer of Pinctada margaritifera (Mollusca)

Dauphin

Nouet

2012

Minerals

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Mollusk shells, especially the nacre, are of commercial interest as well as palaeoenvironmental proxies. They are also investigated as biomaterials for medical purposes and biomimetics. Although the mineralogy is well-known and unique (aragonite tablets), the organic components are various. However, determination of the precise composition of the soluble organic matrix (SOM) of the nacreous layer is difficult. Among the range of possible techniques, 1D electrophoresis and High-performance liquid chromatography (HPLC) have previously been applied separately to differentiate pI and molecular weights. To date, no clear correlation has been established between the two parameters obtained in such conditions. Here, we report the use of preparative electrophoresis, coupled with HPLC, to determine the molecular weights of the pI fractions. The results are compared with 2D gel electrophoresis. It is shown that both methods have drawbacks and advantages, and are not redundant. The complexity of the composition of the nacreous tablet shown by scanning electron microscope (SEM) and Atomic Force Microscope (AFM) observations is also evidenced by electrophoresis and HPLC.

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“…However, distinctive micro structural and mineralogical features were noticed in different families. In subsequent decades studies were mainly directed towards bivalve shells [6][7][8][9] . FTIR spectroscopy is relatively rapid, simple and accurate for detecting calcium carbonate because calcium carbonate shows strong absorption peaks in infrared spectrum at 1430,875 and 712 cm -1 .…”

Section: …………………………………………………………………………………………………… Introduction:-mentioning

confidence: 99%