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・ Birkenhead Street, London
・ Birkenhead Town Hall
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・ Birkenhead, New Zealand
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Birkenia
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・ Birkensnake
・ Birkenstein station
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・ Birkenstraße (Berlin U-Bahn)
・ Birkenwald
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Birkenia : ウィキペディア英語版
Birkenia

''Birkenia'' is a genus of extinct anaspid fish from Middle Silurian strata of Northern Europe, and Middle Silurian to possibly Earliest Devonian strata of Arctic Canada.〔Blom, Henning, T. Märss, and C. G. Miller. "Silurian and earliest Devonian birkeniid anaspids from the Northern Hemisphere." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 92.03 (2001): 263-323. ()〕 Intact fossil specimens of ''B. elegans'' suggest the living animal reached a length of up to , and was an active swimmer. In addition to whole specimens and scale microfossils of ''B. elegans'', which are found in Great Britain and Scandinavia, scales of a second species, ''B. robusta,''〔 are found in Late Silurian strata of Scandinavia and Estonia. The scales of ''B. robusta'' differ from those of ''B. elegans'' in that, as the specific epithet suggests, the scales of the former are more robustly proportioned than those of the latter.
==References==



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