Current issues on the systematics of Japanese fossil proboscideans

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  • 日本産化石長鼻類の系統分類の現状と課題
  • ニホンサン カセキチョウ ビルイ ノ ケイトウ ブンルイ ノ ゲンジョウ ト カダイ

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 Current issues on the systematics of Japanese stegodonts, stegolophodonts, paleoloxodonts mammoths and gomphotheres are reviewed. Phylogenetic hypothesis of the genus Stegodon should be revised based on the study of additional cranial materials which were not used by Saegusa (1987). Comprehensive study on the new materials of primitive stegodonts and stegolophodonts from southern Asia is currently underway in conjunction with the revision of the Japanese stegolophodonts. Cranial materials of Elephas recki recently excavated from Ethiopia provide new insight on the phylogeny of Eurasian Palaeoloxon. E. naumanni can be considered as a relict of once wide spread Palaeoloxodon species represented by a skull from Stuttgart. The external naris of Gomphotherium annectens has been described as narrow by Tassy (1994), but the skull of G. annectens should be re-described pending the repair of the skull. Recent finding of highly derived Sinomastodon from Thailand appears to support the idea that this genus is a sistergroup of New World gomphotheres. However, the idea should be tested by a phylogenetic analysis accompanied with a revision of the New World gomphotheres.

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