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出典:Wikipedia
出典:『Wikipedia』 (2010/07/29 10:23 UTC 版)
Aleosteus ("dice-shaped bone") is an extinct genus of arthrodire placoderm. Its fossils have been found in Sevy Dolomite Formation, in the Egan Range of east-central Nevada, USA. Almost complete fossils belong to juvenile and adult specimens and show a short and broad skull, posteriorly concave.
Aleosteus