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688 results for “ammonoid”
Data from: Polymorphism in Late Cretaceous phylloceratid ammonoids: evidence from ontogenetic trajectories of septal spacing
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Data from: Early evolutionary trends in ammonoid embryonic development
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Data from: Intraspecific variability through ontogeny in early ammonoids
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Data from: Palaeobiogeographical structuration of Smithian (Early Triassic) ammonoid faunas within the western USA basin and its controlling parameters
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Data from: A new ammonoid fauna from the Carnian (Upper Triassic) Kasimlar Formation of the Taurus Mountains (Anatolia, Turkey)
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Data from: The middle Smithian (Early Triassic) ammonoid Arctoceras blomstrandi: Conch morphology and ornamentation in relation to stratigraphy
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Towards an understanding of cosmopolitanism in deep time: a case study of ammonoids from the middle Permian to the Middle Triassic
<p>Cosmopolitanism occurred recurrently during the geological past, especially after mass extinctions, but the underlying mechanisms remain poorly known. Three theoretical models, not mutually exclusive, can lead to cosmopolitanism: (1) selective extinction in endemic taxa, (2) endemic taxa becoming cosmopolitan after the extinction and (3) an increase in the number of newly originated cosmopolitan taxa after extinction. We analyzed an updated occurrence dataset including 831 middle Permian to Middle Triassic ammonoid genera and used two network methods to distinguish major episodes of ammonoid cosmopolitanism during this time interval. Then, we tested the three proposed models in these case studies. Our results confirm that at least two remarkable cosmopolitanism events after the Permian–Triassic and late Smithian (Early Triassic) extinctions, respectively. Partitioned analyses of survivors and newcomers revealed that the immediate cosmopolitanism event (Griesbachian) after the Permian–Triassic event can be attributed to endemic genera becoming cosmopolitan (Model 2) and an increase in the number of newly originated cosmopolitan genera after the extinction (Model 3). Late Smithian cosmopolitanism is caused by selective extinction in endemic taxa (Model 1) and an increase in the number of newly originated cosmopolitan genera (Model 3). We found that the survivors of Permian–Triassic mass extinction did not show a wider geographic range, suggesting that this mass extinction is nonselective among the biogeographic range, while late Smithian survivors exhibit a wide geographic range, indicating selective survivorship among cosmopolitan genera. These successive cosmopolitanism events during severe extinctions are associated with marked environmental upheavals such as rapid climate changes and oceanic anoxic events, suggesting that environmental fluctuations play a significant role in cosmopolitanism.</p>
Data from: Comparing the differential filling of morphospace and allometric space through time: the morphological and developmental dynamics of early Jurassic ammonoids
The evolutionary history of shell geometry of Early Jurassic ammonoids during the Pliensbachian–Toarcian second-order mass extinction is explored at both adult and ontogenetic levels. The ontogenetic approach builds on the concept of allometric space to get insights into the developmental aspects of morphological evolution. Investigation of the deployment of taxa in adult morphospace and allometric space allows the appraisal of the temporal evolution of morphological and allometric disparities. Curves of taxonomic diversity, adult morphological disparity, allometric disparity, and average adult size are contrasted. Results show that during the Pliensbachian–Toarcian interval, ammonoids underwent two successive and drastic declines in taxonomic diversity. Patterns of morphospace and allometric space occupancy suggest nonselective extinction at both morphological and developmental levels. Another measure of allometric disparity suggests the occurrence of two heterochronic trends, a peramorphocline followed by a paedomorphocline, during the Toarcian. These trends are concomitant with changes in average adult size that compensate for the heterochronic effects and explain the striking stability of morphological disparity despite changes in diversity. The results also emphasize the existence of two contrasted evolutionary dynamics in Pliensbachian and Toarcian ammonoids. Methodologically, the allometric disparity approach appears to be a fruitful tool to analyze the rather understudied clade-wide ontogenetic aspects of morphological evolution. Combining multiple approaches to describe clade morphological dynamics leads to a better characterization and understanding of the diversity-disparities relationships and a better distinction of the potential processes driving these macroevolutionary patterns.
Fig. 55 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 55. Lutites plicatus Korn & Hairapetian gen. et sp. nov. A. Lateral and dorsal view, holotype MB.C.30018, section E, float. B. Suture line, holotype MB.C.30018, 13.7 mm ww, 18.6 mm wh. Abbreviations: see Material and methods. Scale bar units = 1 mm.
Fig. 42 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 42. Clivotirolites decoratus Korn & Hairapetian gen. et sp. nov., lateral and dorsal views. A. Paratype MB.C.29938, section 1, -1.50 m. B. Paratype MB.C.29944, section E, float. Scale bar units = 1 mm.
Fig. 38 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 38. Paratirolites quadratus Korn & Ghaderi, 2016. A. Lateral and dorsal view, specimen MB.C.29932, section E, float. B. Suture line, specimen MB.C.29932, at 13.5 mm wh. Abbreviation: see Material and methods. Scale bar units = 1 mm.
Fig. 36 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 36. Paratirolites aduncus Korn & Hairapetian sp. nov. A. Lateral and dorsal view, paratype MB.C.29900, section C, -2.45 m. B. Suture line, paratype MB.C.29900, at 30 mm ww, 16.0 mm wh. Abbreviations: see Material and methods. Scale bar units = 1 mm.
Fig. 30. Paratirolites kittli Stoyanow, 1910. A in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 30. Paratirolites kittli Stoyanow, 1910. A. Lateral and dorsal view, specimen MB.C.29833, section G, -2.75 m. B. Suture line, specimen MB.C.29833, at 30 mm ww, 16.0 mm wh. Abbreviations: see Material and methods. Scale bar units = 1 mm.
Fig. 6 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 6. The stratigraphic occurrence of the ammonoid species in the upper part of the Hambast Formation at Baghuk Mountain C section. EH = extinction horizon.
Fig. 35 in The Changhsingian (Late Permian) ammonoids from Baghuk Mountain (Central Iran)
Fig. 35 (preceding page). Paratirolites aduncus Korn & Hairapetian sp. nov. A–B. Lateral and dorsal views. A. Holotype MB.C.29894, section B, float. B. Paratype MB.C.29880, section 1, -1.60 m. C. Suture line of holotype MB.C.29894, at 17.3 mm wh. D. Whorl profile proportions. Abbreviation: see Material and methods. Scale bar units = 1 mm.
Fig. 18 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 18. Koenenites lamellosus (Sandberger & Sandberger, 1851). A. Cross section of specimen MB.C.22201 from Oberscheld (Königszug Mine). B. Suture line of specimen MB.C.22184 (Koch Coll.) from Oberscheld (Anna Mine), at dm = 29.0 mm, ww = 7.4 mm, wh = 11.1 mm. C–F. Ontogenetic trajectories of the cardinal conch parameters. Scale bar units = 1 mm.
Fig. 9 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 9. Ponticeras aequabile (Beyrich, 1837). A. Cross section of specimen MB.C.30419 from the Dillenburg area. B. Suture line of lectotype MB.C.4289.1 (Beyrich 1835 Coll.) from Oberscheld (Sessacker), at dm = 31.5 mm, wh = 10.0 mm. C–F. Ontogenetic trajectories of the cardinal conch parameters. Scale bar units = 1 mm.
Fig. 3 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 3. The morphological terms used in the description of the ammonoid conchs and suture lines. Illustration from an ink drawing of Acanthoclymenia neapolitana (Clarke, 1892) by Jerzy Dzik (Warsaw).
Fig. 19 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 19. Acanthoclymenia forcipifera (Sandberger & Sandberger, 1851); lectotype 36a in the Wiesbaden collection from Oberscheld; photograph, dorsal reconstruction and reproduction of the figure of
Fig. 15 in The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)
Fig. 15. Taouzites acutus (Matern, 1931). Holotype MB.C.3664 (Etzold 1910 Coll.) from Oberscheld ("Tiefe Grube"). A. Lateral view and dorsal projection. B. Suture line, at dm ca 9 mm, ww = 3.0 mm,
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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