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98 results for “whale evolution”
Figure 32 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 32. Herpetocetus morrowi sp. nov., SDNHM 35294, left referred dentary in lateral view. Scale bar = 10 cm.
Figure 40 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 40. Artistic reconstruction of Herpetocetus morrowi sp. nov. in the late Pliocene Pacific Ocean off southern California. The fish depicted in the upper left is a sheephead (Semicossyphus sp. Ayres, 1854), known from otoliths and isolated teeth from the San Diego Formation (illustration by Robert Boessenecker).
Figure 38 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 38. Herpetocetus morrowi sp. nov., SDNHM 23057, illustrated left dentary showing hypothesized insertion points of the mandibular musculature. A, lateral view; B, medial view; C, dorsal view; D, ventral view. Scale bar = 10 cm. Abbreviation: m, muscle.
Data from: Ancestor-descendant relationships in evolution: origin of the extant pygmy right whale, Caperea marginata
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Data from: Independent evolution of baleen whale gigantism linked to Plio-Pleistocene ocean dynamics
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Data from: Early evolution of the ossicular chain in Cetacea: into the middle ear gears of a semi-aquatic protocetid whale
Modifications of the morphology and acoustic properties of the ossicular chain are among the major changes that accompanied the adaptation of Cetacea to the aquatic environment. Thus, data on the middle ear ossicles of early whales are crucial clues to understand the first steps of the emblematic terrestrial/aquatic transition that occurred in that group. Yet, the delicate nature and very small size of these bones make their preservation in the fossil record extremely rare. Due to the scarcity of available data, major questions remain concerning the sound transmission pathways in early non-fully aquatic whales. Virtual reconstruction of a partially complete ossicular chain of an Eocene protocetid whale documents for the first time the three ossicles of a semi-aquatic archaeocete. Contrary to previous hypotheses, these ossicles present different evolutionary patterns, showing that the ossicular chain does not act as a single morphological module. Functional analyses of the different middle ear units highlight a mosaic pattern of terrestrial and aquatic signatures. This integrative anatomical and functional study brings strong evidence that protocetids were adapted to their dual acoustic environment with efficient hearing in both air and water.
Figure 2 in Description of a new long-snouted beaked whale from the Late Miocene of Denmark: evolution of suction feeding and sexual dimorphism in the Ziphiidae (Cetacea: Odontoceti)
Figure 2. Reconstruction of MSM1001x (holotype), Dagonodum mojnum gen. nov., sp. nov., dorsal view: A, skull; B, mandible. Dotted lines correspond to reconstructed areas. Scale bar = 100 mm.
Figure 19 in Description of a new long-snouted beaked whale from the Late Miocene of Denmark: evolution of suction feeding and sexual dimorphism in the Ziphiidae (Cetacea: Odontoceti)
Figure 19. Boxplot of the ratio AL/TL between the length from the posterior end of the alveolar groove to the posterior end of the mandible (AL) and the total length of the mandible (TL). The circled data correspond to the two long-snouted fossil ziphiids Messapicetus gregarius and Ninoziphius platyrostris, the most similar in size to Dagonodum mojnum gen. nov., sp. nov.
Figure 17 in Description of a new long-snouted beaked whale from the Late Miocene of Denmark: evolution of suction feeding and sexual dimorphism in the Ziphiidae (Cetacea: Odontoceti)
Figure 17. The most parsimonious tree obtained with maximum of parsimony to decipher the relationships of MSM1001x, Dagonodum mojnum gen. nov., sp. nov., among Ziphiidae. Tree length = 215; consistency index = 0.474; retention index = 0.698. Numbers above the branches = bootstrap values; numbers below the branches = absolute Bremer support values. Values of Bootstrap under 50% are not presented. †Fossil species.
Figure 1 in Description of a new long-snouted beaked whale from the Late Miocene of Denmark: evolution of suction feeding and sexual dimorphism in the Ziphiidae (Cetacea: Odontoceti)
Figure 1. Current extension of the Gram Formation in Denmark (shaded area). The type locality is situated in the Gram claypit, 1.5 km north of Gram. Modified from Rasmussen (1966).
Data from: Early evolution of the ossicular chain in Cetacea: into the middle ear gears of a semi-aquatic protocetid whale
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Data from: Population genomics of the killer whale indicates ecotype evolution in sympatry involving both selection and drift
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Data from: Convergence on dental simplification in the evolution of whales
The fossil record of mammal dentition provides crucial insight into key ecological and functional transitions throughout their evolutionary history. For cetaceans, both extant clades differ markedly from their stem ancestors; neither retains the differentiated dentition, nor the tribosphenic molars characteristic of Mammalia. We used quantitative measures of dental complexity across fossil and living cetaceans to identify a trend towards dental simplicity through the Neogene. Both extant cetacean clades depart from the ancestral mammalian condition and concurrently converge upon a reduced and simplified dentition; modern mysticetes all have become entirely edentulous (at birth) and living odontocetes possess teeth as single rooted, conical pegs. These two parallel trends accompany major shifts in feeding strategy (i.e., filter-feeding in mysticetes, and echolocation in odontocetes), suggesting that these evolutionary innovations for prey acquisition are enabling factors for the loss of prey processing and subsequent convergence on dental simplification.
Assessment of olfactory receptor gene evolution in baleen whales
<p>Olfactory receptor genes were mined from whales and terrestrial outgroup species. Dataset includes Whale and outgroup OR nucleotide fasta files, as well as a table containing orthogroup trees in newick format, newick tree containing all baleen whale OR genes (which was used for orthogroup identification), OR family trees, code to reproduce the main findings, and orthogroup tree images.</p> <p> </p>
Data from: Convergence on dental simplification in the evolution of whales
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Assessment of olfactory signaling gene evolution in baleen whales
<p>Contains DNA sequences and alignments for eight chemosensory genes from baleen and toothed whales. Also contains trees used for PAML analysis and orthogroup identification. Jauhal_et_al_Mol_Ecol_analysis.zip contains the code and data needed to reproduce the main figures and tables from the analysis.</p>
Figure 6 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 6. Herpetocetus morrowi sp. nov., UCMP 124950, holotype skull. A, lateral view; B, illustrated lateral view showing major anatomical features. Scale bar = 10 cm.
Evaluating models for olfactory signaling gene evolution in baleen whales
<div> <p>Contains DNA sequences and alignments for eight chemosensory genes from baleen and toothed whales. Also includes PAML results and input files for assessment of selective pressures on various branch models.</p> </div>
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.