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Megerlia

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Journal Article
Published: 01 August 2009
European Journal of Mineralogy (2009) 21 (4): 715–723.
... matrix. Here we report our observation by transmission electron microscopy (TEM) of a large compartment filled with amorphous calcium carbonate (ACC) in the shell of the modern brachiopod Megerlia truncata . The compartment has the typical shape and size of fibrous calcite crystals composing...
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FIGURE 5. Preservation of internal surfaces in  <span class="search-highlight">Megerlia</span>  and  Argyrotheca ...
Published: 01 October 2009
FIGURE 5. Preservation of internal surfaces in Megerlia and Argyrotheca . A) Pristine internal surface of Megerlia echinata with dispersed microborings. Sample 100/8. Scale  =  50 µm. B) Pristine internal surface of Megerlia echinata with abundant microborings. Sample 100/8. Scale  =  50 µm
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FIGURE 11. Differences in multivariate preservation of fragments and comple...
Published: 01 October 2009
FIGURE 11. Differences in multivariate preservation of fragments and complete specimens in (A) rhynchonellids ( Cryptopora ) and (B) terebratulids ( Megerlia ) visualized by NMDS plots. The surfaces fitted by generalized additive models visualize changes in taphonomic alteration and show
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FIGURE 10. Differences in preservation of fragments and complete specimens ...
Published: 01 October 2009
FIGURE 10. Differences in preservation of fragments and complete specimens in (A) rhynchonellids ( Cryptopora ) and (B) terebratulids ( Megerlia ). Fragments of Cryptopora are more altered than complete specimens, whereas fragments of Megerlia do not differ in preservation from complete
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FIGURE 3. Preservation differences among  Argyrotheca ,  Cryptopora ,  Mege...
Published: 01 October 2009
FIGURE 3. Preservation differences among Argyrotheca , Cryptopora , Megerlia , and Platidia . A) Boxplots showing differences in preservation among four genera (all sites combined). Cryptopora is characterized by high fine-scale surface alteration, Megerlia and Argyrotheca by high
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SEM image showing orientation contrasts of a shell section of  <span class="search-highlight">Megerlia</span> tru...
Published: 01 April 2008
F ig . 3. SEM image showing orientation contrasts of a shell section of Megerlia truncata together with an EBSD map taken from a rectangular area marked in red on the SEM image. The EBSD map is given in RGB colours, which represent the three orientational Euler angles. The images at the bottom
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Typical SEM images of the shell microstructure of  <span class="search-highlight">Megerlia</span> truncata  obtai...
Published: 01 May 2007
F igure 1. Typical SEM images of the shell microstructure of Megerlia truncata obtained in forward scattering with a 70° inclined sample. The gray-scale contrasts reflect differences in orientation. Images ( a ) and ( b ) show the outer part of the ventral valve with primary layer (pl
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Cathodoluminescence image of the modern shell of  <span class="search-highlight">Megerlia</span> truncata . Note ...
Published: 01 May 2007
F igure 9. Cathodoluminescence image of the modern shell of Megerlia truncata . Note the red luminescent layer at the inside of the shell, distinguishing a non-luminescent outer secondary layer and a luminescent inner secondary layer. The luminescent band widens at the skeletal parts
Journal Article
Journal: PALAIOS
Published: 01 October 2009
PALAIOS (2009) 24 (10): 697–716.
...FIGURE 5. Preservation of internal surfaces in Megerlia and Argyrotheca . A) Pristine internal surface of Megerlia echinata with dispersed microborings. Sample 100/8. Scale  =  50 µm. B) Pristine internal surface of Megerlia echinata with abundant microborings. Sample 100/8. Scale  =  50 µm...
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Journal Article
Published: 01 May 2007
American Mineralogist (2007) 92 (5-6): 722–734.
...F igure 1. Typical SEM images of the shell microstructure of Megerlia truncata obtained in forward scattering with a 70° inclined sample. The gray-scale contrasts reflect differences in orientation. Images ( a ) and ( b ) show the outer part of the ventral valve with primary layer (pl...
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Journal Article
Published: 01 July 2004
European Journal of Mineralogy (2004) 16 (4): 693–697.
...Wolfgang W. SCHMAHL; Erika GRIESSHABER; Rolf NEUSER; Anette LENZE; Reinhart JOB; Uwe BRAND Abstract We investigated the ultrastructure of the secondary layer of the calcite shell of the terebratulide brachiopod Megerlia truncata with SEM and electron beam backscattering diffraction. The material...
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Journal Article
Published: 01 April 2008
Mineralogical Magazine (2008) 72 (2): 541–562.
...F ig . 3. SEM image showing orientation contrasts of a shell section of Megerlia truncata together with an EBSD map taken from a rectangular area marked in red on the SEM image. The EBSD map is given in RGB colours, which represent the three orientational Euler angles. The images at the bottom...
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Journal Article
Published: 01 April 2009
European Journal of Mineralogy (2009) 21 (2): 303–315.
... & Fallick, 2002 ; Auclair et al. , 2003 ; Brand et al. , 2003 ; Weiner & Dove, 2003 , Parkinson et al. , 2005 ). Our previous work on the microstructure and the texture of specimens of the recent terebratulid brachiopod species Megerlia truncata and Terebratalia transversa revealed...
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Journal Article
Published: 01 January 1960
Bulletin de la Société Géologique de France (1960) S7-II (2): 152–155.
...Graham F. Elliott Abstract Describes three Tertiary brachiopods from the Middle East--Streptaria arabica n.sp. from the Eocene of Arabia, Argyrotheca zenobiae n.sp. from the Miocene of Syria, and Megerlia truncata from the Pliocene of Syria. Their distribution and affinities are briefly discussed...
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Examples for location and shape of Vickers microhardness indents in the hin...
Published: 01 May 2007
F igure 7. Examples for location and shape of Vickers microhardness indents in the hinge (posterior) and commisure (anterior) parts of the shell of Megerlia truncata . The indents were imaged with an interference microscope ( Lohkämper et al. 2003 ). The scale bar in the images of the indents
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Large Vickers hardness indentations are shown in a cross-section of the cal...
Published: 01 April 2008
F ig . 6. Large Vickers hardness indentations are shown in a cross-section of the calcitic shell of Megerlia truncata. The indentations were made with a load of 50 ponds and a holding time of 10 s. Indents with the same load on the (104) plane of calcite give values of 136±5 HV 0.05/10
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Nano-indentation maps of ( a )  Lingula anatina ; ( b )  Discradisca stella...
Published: 01 April 2008
F ig . 9. Nano-indentation maps of ( a ) Lingula anatina ; ( b ) Discradisca stella ; and ( c ) Megerlia truncata displaying the nanohardness in GPa. The laminated structures of the chitinophosphatic shells of Lingula anatina and Discradisca stella have varying proportions of hard
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TEM images of FIB-prepared samples of fibres from the secondary layer of  M...
Published: 01 April 2008
F ig . 2. TEM images of FIB-prepared samples of fibres from the secondary layer of Megerlia truncata . Image contrasts are dominated by bend contours. ( a ) Shows a micrograph covering several cross-sectioned fibres as well as the intercrystalline organic film between the fibres (indicated
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Scanning electron micrograph of a portion of the secondary layer of the she...
Published: 01 July 2004
Fig. 2. Scanning electron micrograph of a portion of the secondary layer of the shell of Megerlia truncata with well exposed longitudinal sections of calcite crystal fibres. Euler angles of the crystal lattice orientation with respect to the sample coordinate system are given for various points
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Vickers microhardness indents along a cross-section of the calcitic shell o...
Published: 01 April 2008
F ig . 7. Vickers microhardness indents along a cross-section of the calcitic shell of Megerlia truncata . The HV 0.005/10 microhardness values are plotted as a function of the fractional distance from the outer margin of the shell. Indents made into individual fibres in transverse cross