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875 results for “Brachiopod”
FIGURE 9 in Application of shell spiral deviation methodology to fossil brachiopods: Implications for obtaining specimen ontogenetic ages
FIGURE 9. Comparison of spiral deviation graphs when the dorsal valve of Terebratula terebratula specimen is fit to one (left) and two (right) spirals. A and B represent locations on the graphs that change drastically when two spirals are fit to the biological outline instead of one. Minimum A becomes more distinct when two spirals are used whereas the opposite occurs for minimum B.
FIGURE 3 in Application of shell spiral deviation methodology to fossil brachiopods: Implications for obtaining specimen ontogenetic ages
FIGURE 3. Example of shell (Laqueus rubellus) digitization and spiral fitting. 1, The brachiopod shell was digitized by clicking the outline in an anterior-ward direction, starting at the umbo. 2, The digitized outline was saved as (x,y) coordinates, which were used to plot a biological outline in R. 3, R code was used to fit a perfect logarithmic spiral to the shell outline. 4, The deviations from a perfect spiral were represented in a spiral deviation graph, with green points representing spiral maxima and red points representing spiral minima.
Repository for: Combinatorial Wnt signaling landscape during brachiopod anteroposterior patterning
<p>This repository contains the data and analyses for the manuscript:</p> <p>Vellutini, B. C., Martín-Durán, J. M., Børve, A. & Hejnol, A. <strong>Combinatorial Wnt signaling landscape during brachiopod anteroposterior patterning.</strong> BMC Biol. 22, 1–23 (2024). <a href="https://doi.org/10.1186/s12915-024-01988-w" rel="nofollow">https://doi.org/10.1186/s12915-024-01988-w</a></p> <p>The source is maintained at <a href="https://github.com/bruvellu/terebratalia-wnts">https://github.com/bruvellu/terebratalia-wnts</a>.</p>
FIGURE 14 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 14. Three-dimensional rotational model (video) of Timaniella harkeri (GSC26406). For video see palaeo-electronica.org/content/2017/1891-xmt-on-brachiopod-fossils.
FIGURE 12 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 12. XMT result of Tyloplecta nankingensis (Q-2). 1-7, serial slices in the transverse plane (from dorsal to ventral). 8-14, serial slices in the coronal plane (from posterior to anterior). 15-18, serial slices in the sagittal plane (from lateral to middle). 19-21, lateral (19), ventral (20) and dorsal (21) views of the reconstructed 3-D model (external shell). 22, ventral view of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 1 option in DataViewer). Abbreviations: cp, cardinal process; ap, adductor platform; ms, median septum; mc, muscle scar.
FIGURE 13 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 13. Three-dimensional reconstruction model of internal shell structures of Timaniella harkeri (GSC26406). 1-6, dorsal and anterior views of the whole shell interior through posteriorly continuous rotation. 7-12, dorsal and anterior views of shell interior without spiralia through posteriorly continuous rotation.
FIGURE 11 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 11. XMT result of Meekella sangzhiensis (Q-1). 1-7, serial slices in the coronal plane (from posterior to anterior). 8-15, serial slices in the transverse plane (from ventral to dorsal). 16-21, serial slices in the sagittal plane (from lateral to middle). 22-24, lateral (22), ventral (23) and dorsal (24) views of the reconstructed 3-D model (external shell). 25, ventral view of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 1 option in DataViewer). Abbreviation: dp, dental plate.
FIGURE 9 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 9. XMT result of Cyrtospirifer whitneyi (CD). 1-10, serial slices in the coronal plane (from posterior to anterior). 11-18, serial slices in the transverse plane (from ventral to dorsal). 19-24, serial slices in the sagittal plane (from lateral to middle). 25-28, lateral (25), ventral (26), dorsal (27) and posterior (28) views of the reconstructed 3-D model (external shell). 29, ventral view of the 3-D model in transparent mode. All the slice images were obtained under falsecolor lookup tables (Color 1 option in DataViewer). Abbreviations: dp, dental plates; tt, teeth.
FIGURE 10 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 10. XMT result of Spiriferidae gen. sp. indet. (S1). 1-8, serial slices in the coronal plane (from posterior to anterior). 9-15, serial slices in the transverse plane (from ventral to dorsal). 16-21, serial slices in the sagittal plane (from lateral to middle). 22-24, lateral (22), ventral (23) and posterior (24) views of the reconstructed 3-D model (external shell). 25, ventral view of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 1 option in DataViewer). Abbreviation: dp, dental plates.
FIGURE 8 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 8. XMT result of Indospirifer sp. (3229). 1-8, serial slices in the coronal plane (from posterior to anterior). 9-15, serial slices in the transverse plane (from ventral to dorsal). 16-20, serial slices in the sagittal plane (from lateral to middle). 21-22, lateral (21) and ventral (22) views of the reconstructed 3-D model (external shell). 23-24, ventral (23) and ventroanterior (24) views of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 1 option in DataViewer). Abbreviations: dp, dental plates; cp, cardinal process; hp, hinge plate; sp, spiralia.
FIGURE 5 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 5. XMT result of Cleiothyridina baracoodensis (ML32). 1-11, serial slices in the coronal plane (from posterior to anterior). 12-21, serial slices in the transverse plane (from ventral to dorsal). 22-27, serial slices in the sagittal plane (from lateral to middle). 28-31, lateral (28), ventral (29), dorsal (30) and posterior (31) views of the reconstructed 3-D model (external shell). 32, ventral view of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 2 option in DataViewer). Abbreviations: tt, teeth; sk, socket; cf, cardinal flanges.
FIGURE 4 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 4. XMT result of Stenoscisma timorense (BS-2). 1-10, serial slices in the coronal plane (from posterior to anterior). 11-17, serial slices in the transverse plane (from ventral to dorsal). 18-22, serial slices in the sagittal plane (from lateral to middle). 23-25, lateral (23), ventral (24) and dorsal (25) views of the reconstructed 3-D model (external shell). 26, posterior view of the coronally sectioned 3-D model. 27, ventral view of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 1 option in DataViewer). Abbreviations: sd, spondylium; tt, teeth.
FIGURE 7 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 7. XMT result of Spiriferina sp. (BS-1). 1-7, serial slices in the coronal plane (from posterior to anterior). 8-14, serial slices in the transverse plane (from ventral to dorsal). 15-19, serial slices in the sagittal plane (from lateral to middle). 20-22, lateral (20), ventral (21) and dorsal (22) views of the reconstructed 3-D model (external shell). 23, ventral view of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 1 option in DataViewer). Abbreviations: dp, dental plates; ms, median septum; sp, spiralia; tt, teeth; cr, crus; sk, socket.
FIGURE 6 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 6. XMT result of Tylothyris transversa (TeP). 1-7, serial slices in the coronal plane (from posterior to anterior). 8-14, serial slices in the transverse plane (from ventral to dorsal). 15-19, serial slices in the sagittal plane (from lateral to middle). 20-22, lateral (20), ventral (21) and dorsal (22) views of the reconstructed 3-D model (external shell). 23, ventral view of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 1 option in DataViewer). Abbreviation: sp, spiralia.
FIGURE 2 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 2. Thin section and cathodoluminescence (CL) photomicrographs: Indospirifer sp. (3229) (1-4), Cyrtospirifer whitneyi (CD) (5-8), Spiriferidae gen. sp. indet. (S1) (9-12), Spiriferella loveni (F8) (13-16), Meekella sangzhiensis (Q- 1) (17-18) and Tyloplecta nanjingensis (Q-2) (19-20). 1, plane-polarized light (PPL) image of infilling micrite and shell fragments scattered. 2-3, transmitted light (TL) (2) and corresponding CL (3) images of luminescent shell. 4, CL image showing slightly luminescent shell. 5-8, TL (5, 7) and CL (6, 8) images of both luminescent shell and infilling sediment. 9-10, PPL images of brachiopod shell, infilling packstone and thin silicified layer along their boundary. 11- 12, TL (11) and CL (12) images of nonluminescent shell. 13-16, TL (13, 15) and CL (14, 16) images showing a variety of shell luminescence and infilling sediment composed of calcitic skeletal grains (bryozoan in 15 and 16). 17-20, PPL (17, 19, 20) and TL (18) images of both silicified shells and infillings. Abbreviations: bs, brachiopod shell; im, infilling material; fs, fragmented shell; os, other shell material; sl, silicified layer; NL, nonluminescent; SL, slightly luminescent; L, luminescent.
FIGURE 3 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 3. XMT result of Timaniella harkeri (GSC26406). 1-10, serial slices in the coronal plane (from posterior to anterior). 11-17, serial slices in the transverse plane (from ventral to dorsal). 18-22, serial slices in the sagittal plane (from lateral to middle). 23-25, lateral (23), ventral (24) and dorsal (25) views of the reconstructed 3-D model (external shell). 26, ventral view of the 3-D model in transparent mode. All the slice images were obtained under false-color lookup tables (Color 2 option in DataViewer). Abbreviations: tt, teeth; sp, spiralia; sk, socket.
FIGURE 1 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods
FIGURE 1. Thin section and cathodoluminescence (CL) photomicrographs: Timaniella harkeri (GSC26406) (1-4), Spiriferina sp. (BS-1) (5-8), Stenoscisma timorense (BS-2) (9-12), Cleiothyridina baracoodensis (ML32) (13-16) and Tylothyris transversa (TeP) (17-20). 1-2, transmitted light (TL) (1) and corresponding CL images (2) of nonluminescent shell and infilling sediment composed of fine sand grains. 3-4, TL (3) and CL (4) images of nonluminescent associated with partially luminescent shell in the cardinal area of dorsal valve. 5-8, TL (5, 7) and CL (6, 8) images of nonluminescent associated with partially luminescent shell and luminescent infilling cement. 9-12, TL (9, 11) and CL (10, 12) images of luminescent shell with thin silicified layers and recrystallization along inner wall of brachiopod shell. 13, plane-polarized light (PPL) image of the original infilling sediment composed of calcareous sands. 14, PPL image showing the section of infilling cement. 15-16, TL (15) and CL (16) images of slightly luminescent shell. 17, PPL image of infilling comprising lime mud, calcite cement and relatively large, radially arranged, siliceous crystals. 18-19, TL (18) and CL (19) images of nonluminescent associated with partially luminescent shell. 20, CL image showing the section of nonluminescent internal shell structure (spiralia) preserved within infilling (This structure is hardly recognized in the TL image). Abbreviations: bs, brachiopod shell; im, infilling material; sl, silicified layer; cc, calcite crystal; NL, nonluminescent; SL, slightly luminescent; L, luminescent.
FIGURE 28 in New insights on Tournaisian-Visean (Carboniferous, Mississippian) athyridide, orthotetide, rhynchonellide, and strophomenide brachiopods from southern Belgium
FIGURE 28. Coveenia ulothrix (de Koninck, 1843) from the Tournai area, Tournai Formation (Tournaisian). 1-5, 16-18, ULg.PA.2016.12.25/10, articulated specimen in ventral, dorsal, lateral, posterior and anterior views, and detail (SEM) of the foramen and the symphytium, and of circular drill hole developed close to the dorsal anterior margin. 6-10, RBINS a13140, articulated specimen in ventral, dorsal, lateral, posterior, and anterior views, Dutoit quarry, Pont-àRieu. 11-15, RBINS a13141, articulated specimen, almost complete, in ventral, dorsal, lateral, posterior and anterior views, Dutoit quarry, Pont-à-Rieu. Scale bar equals 10 mm (1-15), 1 mm (16-18).
FIGURE 24 in New insights on Tournaisian-Visean (Carboniferous, Mississippian) athyridide, orthotetide, rhynchonellide, and strophomenide brachiopods from southern Belgium
FIGURE 24. Scatter diagrams of Lamellosathyris lamellosa (Léveillé, 1835). N: number of specimens measured, r²: coefficient of linear regression. 1, Relation between shell width and length. 2, Relation between shell width and shell width/shell length ratio. 3, Relation beween shell width and thickness. 4, Relation between shell width and shell thickness/shell width ratio.
FIGURE 27 in New insights on Tournaisian-Visean (Carboniferous, Mississippian) athyridide, orthotetide, rhynchonellide, and strophomenide brachiopods from southern Belgium
FIGURE 27. Scatter diagrams of Nucleospira hannoniae nom. nov. N: number of specimens measured. 1, Relation between shell width and length. 2, Relation between width and shell length/shell width ratio. 3, Relation beween shell width and thickness. 4, Relation between shell width and shell thickness/shell width ratio.
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