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Didymoceras

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Journal Article
Journal: Paleobiology
Published: 01 May 2020
Paleobiology (2020) 46 (2): 237–258.
.... Such changes may have been responses to different selective pressures at different life stages. The hydrostatic properties of three species of Didymoceras ( D. stevensoni , D. nebrascense , and D. cheyennense ) were investigated by creating virtual 3D models at several stages during growth. These models were...
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Journal Article
Published: 01 May 2010
Journal of Paleontology (2010) 84 (3): 556–560.
...ISABELLE KRUTA; NEIL H. LANDMAN; ISABELLE ROUGET; FABRIZIO CECCA; NEAL L. LARSON Abstract We report on well-preserved upper and lower jaws found inside the body chambers of two specimens of Didymoceras nebrascense (Meek and Hayden, 1856) from the Upper Cretaceous Pierre Shale of the USA. The finds...
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Invertebrate fossils from Upper Cretaceous (Campanian) cold-methane seep de...
Published: 01 June 2016
Fig. 3.— Invertebrate fossils from Upper Cretaceous (Campanian) cold-methane seep deposits and age-equivalent non-seep sites in the Pierre Shale, South Dakota and Wyoming. A ) Baculites corrugatus Elias 1933 , mature macroconch, ventral view, with aperture on top, AMNH 58552, Didymoceras
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Cold methane seep deposits in the Upper Cretaceous Pierre Shale, South Dako...
Published: 26 March 2020
Fig. 2.— Cold methane seep deposits in the Upper Cretaceous Pierre Shale, South Dakota. A ) Overview of seep deposit at AMNH loc. 3812, Didymoceras cheyennense–Baculites compressus Zones, Pierre Shale, Custer County. B ) Exposure of seep deposit in cross section (arrow), AMNH 3418
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USNM specimens used for model construction.  <span class="search-highlight">Didymoceras</span> stevensoni  (A, US...
Published: 01 May 2020
Figure 2. USNM specimens used for model construction. Didymoceras stevensoni (A, USNM 430976). Majority of D. nebrascense (B, USNM 430977), apical portion of D. nebrascense (C, USNM 450333). Majority of D. cheyennense (D, USNM 445155), apical portions of D. cheyennense (E, USNM 445099
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A, Exterior 3D model of  <span class="search-highlight">Didymoceras</span> stevensoni  (USNM 430976) created with...
Published: 01 May 2020
Figure 3. A, Exterior 3D model of Didymoceras stevensoni (USNM 430976) created with photogrammetry in 3DF Zephyr. B, Wireframe view of exterior shell created with array instructions in Blender v. 2.76 after using the photogrammetry model as a stencil ( Table 1 ).
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Array instructions used to build each model of  <span class="search-highlight">Didymoceras</span> . Each array is...
Published: 01 May 2020
Table 1. Array instructions used to build each model of Didymoceras . Each array is used in a piecewise manner to replicate the initial whorl section, while simultaneously translating, rotating, and scaling. Asterisks mark the arrays where the origin must be reset to accommodate tighter whorls
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Creation of  <span class="search-highlight">Didymoceras</span>  septa. A, Model septum of  D. nebrascense  (WSU 1...
Published: 01 May 2020
Figure 4. Creation of Didymoceras septa. A, Model septum of D. nebrascense (WSU 1459) preserving first- and second-order folds. B, Suture of D. stevensoni (WSU 1461). C, Suture of D. nebrascense (WSU 1462). D, Suture of D. cheyennense (WSU 1463). E, Model septum of D. stevensoni . F
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A–G, Hydrostatic models of  <span class="search-highlight">Didymoceras</span> stevensoni  throughout ontogeny sho...
Published: 01 May 2020
Figure 6. A–G, Hydrostatic models of Didymoceras stevensoni throughout ontogeny showing static syn vivo orientations and the locations of the centers of buoyancy (tip of upper cone, circle) and centers of mass (tip of lower cone, x). Scale bars, 1 cm.
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Hydrostatic metrics computed for  <span class="search-highlight">Didymoceras</span> stevensoni  for each of the s...
Published: 01 May 2020
Figure 7. Hydrostatic metrics computed for Didymoceras stevensoni for each of the seven ontogenetic stages represented in Fig. 6 . The percentage of the cameral volumes emptied for neutral buoyancy (Φ; circles), hydrostatic stability index ( S t ; squares), and the angle of the aperture
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A–G, Hydrostatic models of  <span class="search-highlight">Didymoceras</span> nebrascense  throughout ontogeny sh...
Published: 01 May 2020
Figure 8. A–G, Hydrostatic models of Didymoceras nebrascense throughout ontogeny showing static syn vivo orientations and the locations of the centers of buoyancy (tip of upper cone, circle) and centers of mass (tip of lower cone, x). Scale bars, 1 cm.
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Hydrostatic metrics computed for  <span class="search-highlight">Didymoceras</span> nebrascense  for each of the ...
Published: 01 May 2020
Figure 9. Hydrostatic metrics computed for Didymoceras nebrascense for each of the seven ontogenetic stages represented in Fig. 8 . The percentage of the cameral volumes emptied for neutral buoyancy (Φ; circles), hydrostatic stability index ( S t ; squares), and the angle of the aperture
Image
A–G, Hydrostatic models of  <span class="search-highlight">Didymoceras</span> cheyennense  throughout ontogeny sh...
Published: 01 May 2020
Figure 10. A–G, Hydrostatic models of Didymoceras cheyennense throughout ontogeny showing static syn vivo orientations and the locations of the centers of buoyancy (tip of upper cone, circles) and centers of mass (tip of lower cone, x). Scale bars, 1 cm.
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Hydrostatic metrics computed for  <span class="search-highlight">Didymoceras</span> cheyennense  for each of the ...
Published: 01 May 2020
Figure 11. Hydrostatic metrics computed for Didymoceras cheyennense for each of the seven ontogenetic stages represented in Fig. 10 . The percentage of the cameral volumes emptied for neutral buoyancy (Φ; circles), hydrostatic stability index ( S t ; squares), and the angle of the aperture
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The volumes ( V ) and masses ( m ) for each component of the  <span class="search-highlight">Didymoceras</span>  ...
Published: 01 May 2020
Table 3. The volumes ( V ) and masses ( m ) for each component of the Didymoceras models (sh, shell; sb, soft body; cg, cameral gas; cl, cameral liquid; ct, camerae total; wd, water displaced) for each ontogenetic stage (denoted by a number after the species name: 1 = earliest juvenile to 7
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Invertebrate fossils from cold-methane seep deposits in the  <span class="search-highlight">Didymoceras</span> ch...
Published: 01 June 2016
Table 3.— Invertebrate fossils from cold-methane seep deposits in the Didymoceras cheyennense Zone, Pierre Shale, southwestern South Dakota. The % organisms listed on the bottom represents the percentage of the total number of specimens. For example, % foundation is the percentage
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Figure  1 —Reconstruction of the jaws of  <span class="search-highlight">Didymoceras</span> nebrascense  showing ...
Published: 01 May 2010
Figure 1 —Reconstruction of the jaws of Didymoceras nebrascense showing the conventions used and the measurements. HH: height of the hood, ML: maximum length, BL: length of base, DW: width of the wing, MW: maximum length of the wing. Only the gray area of the upper jaw was preserved
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Campanian ammonite zones of the Western Interior Seaway (WIS) represented b...
Published: 27 December 2018
Museum of Geology; RR, Richards Ranch. Ammonite zone Age (Ma) Associated species Black Hills fossil samples Baculites compressus 73.52 ± 0.39 Nymphalucina subundata AMNH 3419, 3456, 3457, 3488, 3490–3492, 3503, 3504 Didymoceras cheyennense 74.67 ± 0.15 Nymphalucina
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Sea-level curve (eustasy plus water loading) ( Miller et al. 2005a ) and Se...
Published: 01 May 2015
Fig. 24.— Sea-level curve (eustasy plus water loading) ( Miller et al. 2005a ) and Sevier thrusting episodes in central Utah ( DeCelles and Coogan 2006 ) during middle to late Campanian. Timescale is from Ogg et al. (2004) . Ages are as follows: 76.38–75.74 Ma ( Didymoceras nebrascense
Journal Article
Journal: PALAIOS
Published: 01 June 2016
PALAIOS (2016) 31 (6): 291–301.
...Fig. 3.— Invertebrate fossils from Upper Cretaceous (Campanian) cold-methane seep deposits and age-equivalent non-seep sites in the Pierre Shale, South Dakota and Wyoming. A ) Baculites corrugatus Elias 1933 , mature macroconch, ventral view, with aperture on top, AMNH 58552, Didymoceras...
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