Shell Formation

Wilbur, Karl M.; Saleuddin, A. S. M.

doi:10.1016/b978-0-12-751404-8.50014-1

Cited by 210 publications

(226 citation statements)

References 84 publications

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“…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%

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%

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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“…It is well known that primary productivity and barite formation are closely associated (e.g., Dehairs et al, 1980;1987). Once inside the digestive tract, Ba may be metabolized and moved via the 110 hemolymph to the extrapallial fluid (EPF), where shell precipitation occurs (Wilbur and Saleuddin, 1983). Vander Putten et al (2000) found a remarkable coincidence of the Ba peaks in several mussel shells collected at the same site, providing further evidence that an environmental parameter controls their occurrence.…”

mentioning

confidence: 94%

“…Elements move into the EPF through the epithelial mantle cells which are supplied 455 from the hemolymph (Wilbur and Saleuddin, 1983). Ions enter the hemolymph of marine mollusks primarily through the gills, although they may also enter via the gut (see Wilbur and Saleuddin, 1983 and references therein).…”

Section: Pathway Of Barium Incorporation Into the Shell 440mentioning

confidence: 99%

Barium uptake into the shells of the common mussel (Mytilus edulis) and the potential for estuarine paleo-chemistry reconstruction

Gillikin

Dehairs

Lorrain

et al. 2006

Geochimica et Cosmochimica Acta

171

164

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“…This zinc metaloenzyme accelerates bicarbonate formation and plays an important role in several physiological functions: respiration, ion transport, acid-base regulation, and biomineralization. The activity of CA and its influence on physiological functions in Mollusca have been examined by many authors (Wilbur and Anderson 1950;Kawai 1955;Freeman 1960;Nielsen and Frieden 1972;Wilbur and Saleuddin 1983;Erlichman et al 1994;Miyamoto et al 1996). However, the effect of CA activity on biomineralization processes in adult bivalve shells as well as in the early larval stages have been insufficiently studied so far (Medaković and Lucu 1994;Medaković 1995).…”

Section: Introductionmentioning

confidence: 99%

Carbonic anhydrase activity and biomineralization process in embryos, larvae and adult blue mussels Mytilus edulis L.

Medaković¹

2000

Helgoland Marine Research

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To decide whether a physiological role can be attributed to enzymatic activity with respect to crystal formation and biomineralization of the first larval shell, carbonic anhydrase (CA) activity was measured in embryos and larvae of the blue mussels Mytilus edulis L. Also, CA activity was determined in the mantle edge and gonads of adult mussels with different shell length and condition index. The intention was to find a possible correlation between CA activity and adult shell calcification, i.e. gonadal maturation. The comparison of CA activity in different developmental stages of mussels and the results of an X-ray diffraction study of biomineralization processes in embryonic and larval shells indicate that CA activity is maximal at the end of several developmental stages. Consequently, the increase in CA activity precedes some physiological changes, i.e. the somatoblast 2d formation and the occurrence of the first calcite and quartz crystals in embryos, shell field formation in the gastrula stage, shell gland and periostracum production in trochophores, and rapid aragonite deposition in larval prodissoconch I and prodissoconch II shells. Furthermore, it was found that in adult mussels CA activity was quite variable and that in the mantle edge it was frequently inversely related to the activity in the gonad.

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Shell Formation

Cited by 210 publications

References 84 publications

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

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

Barium uptake into the shells of the common mussel (Mytilus edulis) and the potential for estuarine paleo-chemistry reconstruction

Carbonic anhydrase activity and biomineralization process in embryos, larvae and adult blue mussels Mytilus edulis L.

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