誤られた日本産巨角鹿類
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概要
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Lately a good material of the antlers of fossil Megacerotids has been unearthed from the bottom of the Nojiri Lake, Nagano Prefecture, and is preserved in the Geological Institute, Shinshu University, Matsumoto City. The writer, together with Prof. MORI, visited in April, 1973, the lake and the Institute for study, and got the idea of the convincing age of the fossiliferous, as well as culture-bearing, bed there. It yields also the remains of <I>Loxodonta (Palaeoloxodon) namadica naumanni</I> MAKIYAMA and the relics of the Miyagian, as identified by the writer, thus enabling even a worldwide correlation of the strata. In the writers opinion, it belongs to the upper half of the Tokyo Bed and is referred to the Second Section of the Pleistocene, viz, the 2nd Glacial-2nd Interglacial.<BR>Though helplessly misunderstood and confounded by some authors, the upper Pliocene and the Pleistocene Megacerotids in Japan are quite distinct from each other, being even generically so. All the known remains of them of the Pleistocene in Japan would belong to the single species <I>Sinomegaceros mongoliae</I> (BOULE & TEILHARD DE CHARDIN) . The writer could find in the original definition of <I>Sinomegaceroides</I> SHIKAMA no fair reason to make it distinct from <I>Sinomegaceros</I> DIETRICH. The fragmental palmate crown of antler from the flood-plain deposit of the Sagami River, referred to <I>Alces</I> sp. by HASEGAWA, is in the writer's opinion a good material merely of <I>Sinomegaceros mongoliae</I>.<BR>The writer has tried to restore the antlers of the Pleistocene and other Megacerotids in order to make clear how they are distinguished from each other and how they arrange in a fair series of evolutionary succession.