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The paleobiogeographical significance of the Silurian and Devonian trilobites of Japan
Stocker, C.P.; Siveter, D.J.; Lane, P.D.; Williams, M.; Oji, T.; Wallis, S.R.; Tanaka, G.; Komatsu, T.; Siveter, D.J.; Vandenbroucke, T.R.A. (2019). The paleobiogeographical significance of the Silurian and Devonian trilobites of Japan. Island Arc 28(2): e12287. https://dx.doi.org/10.1111/iar.12287
In: Island Arc. Wiley-Blackwell: Hoboken. ISSN 1038-4871; e-ISSN 1440-1738
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| Trefwoord |
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| Author keywords |
biogeography; biostratigraphy; Devonian; Japan; lithofacies; Silurian;trilobites |
| Auteurs | | Top |
- Stocker, C.P.
- Siveter, D.J.
- Lane, P.D.
- Williams, M.
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- Oji, T.
- Wallis, S.R.
- Tanaka, G.
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- Komatsu, T.
- Siveter, D.J.
- Vandenbroucke, T.R.A.
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| Abstract |
Six major groups of trilobites from the Silurian and Devonian of Japan are evaluated for their paleobiogeographical signature. Silurian illaenids and scutelluids show four generic-level and at least two species-level links with the Australian segment of the Gondwana paleocontinent; encrinurids also indicate two generic-level links with Australia and also the South China paleocontinent; whilst Devonian phacopids, and possibly proetids, suggest at least two generic-level links with the North China paleocontinent. These different patterns may reflect the fragmentary biostratigraphical record of Japanese trilobites, but they also appear to reflect paleoenvironmental parameters associated with lithofacies, and paleoecology. Thus, Japanese assemblages of proetids and phacopids occurring in deep-water clastic lithofacies have counterparts in similar settings in North China, and Japanese scutelluids and illaenids are strongly associated with shallow marine carbonate lithofacies that are similar to those of their occurrences in Australia. Japanese encrinurids occur in carbonate rocks indicative of shallow marine settings in the Kurosegawa Terrane, and they demonstrate a consistent paleobiogeographical affinity with Australia and South China. Larval ecology cannot be directly assessed for Japanese trilobite groups. However, proetids have consistently been shown to have planktonic protaspides, whereas illaenids, scutelluids, and encrinurids have benthic protaspides. Planktonic protaspides would have a greater propensity for distribution in ocean currents than benthic ones, and therefore may be of more limited paleobiogeographical utility. The combined data from the six different groups indicates that the complex paleobiogeographical patterns of the Japanese trilobite assemblages need to be interpreted with caution, and similarity of taxa does not necessarily denote paleogeographical proximity to other regions. |
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