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- W2247337339 abstract "The small, variously bilobate shells of the brachiopod genus Dicoelosia have generally been considered as adaptations to relatively deep- and quiet-water environments (BA4 or deeper). Many species of Dicoelosia, however, invaded relatively shallow-water habitats intermittently throughout the geological range of the genus from Katian (Late Ordovician) to Lochkovian (Early Devonian) times. In this study, the relationship between morphological adaptations and living environments of different forms of Dicoelosia are investigated based on a global compilation of Dicoelosia species. Multivariate and other numerical analyses of 11 measurements from each of 92 selected specimens indicate several trends of morphological change in time and space: 1, the Late Ordovician species were predominantly wider than long, with strongly divergent lobes, whereas the later forms in the Silurian and Early Devonian developed more elongate shells with weakly divergent to subparallel lobes; 2, from the early Silurian to Early Devonian, the profile of individual lobes changed from concavo-convex to biconvex; 3, the deeper-water shells have proportionally longer and more slender lobes with a deeper anteromedial emargination than the shallower-water forms, especially during the Silurian. These morphological changes were likely related to an optimisation of the lophophore tissue volume versus the lophophore-water interface area along the lobe margin, which would have improved the efficiency of the lophophores for suspension filter feeding and gas exchange, especially in deep-water, oxygen-poor environments." @default.
- W2247337339 created "2016-06-24" @default.
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- W2247337339 date "2011-01-01" @default.
- W2247337339 modified "2023-10-02" @default.
- W2247337339 title "Evolution and Environmental Adaptation of the Late Ordovician - Early Devonian Orthide Brachiopod 'Dicoelosia'" @default.
- W2247337339 hasPublicationYear "2011" @default.
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