Gangamopteris

Japanese: Gangamopteris
Gangamopteris

…The Southern Hemisphere Gondwana flora, which is separated from the Angara flora by the Tethys Ocean, is dominated by 90% simple-leafed Glossopteris , indicating that it arose in a harsh climate, whereas the macrophyllous plants in the Angara flora are pinnately compound, with no simple leaves. This indicates that they arose in a milder climate than the Gondwana flora, based on the principle that simple leaves arise from pinnately compound leaves as a result of environmental deterioration. However, Glossopteris and Gangamopteris , which are characteristic genera of the Southern Hemisphere Gondwana flora, are sometimes reported in the Angara flora. These were initially thought to have migrated from the Gondwana continent, but are now interpreted as parallel evolution rather than migration, based on the general principle that similar environments produce plants with similar forms. …

*Some of the terminology that mentions "Gangamopteris" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…アンガラ植物群にテチス海をへだてて対立する南半球のゴンドワナ植物群は単葉のグロッソプテリスGlossopteris類が9割も占めて,きびしい気候下に生じたことを示しているが,アンガラ植物群の中の大葉類には単葉がなく,羽状複葉性の植物ばかりで,これは単葉は羽状複葉から環境の悪化が原因して生ずるという原則からみて,ゴンドワナ植物群よりもゆるやかな気候下に生じたことを示している。しかし,ときにアンガラ植物群の中に南半球ゴンドワナ植物群の特徴属であるグロッソプテリスやガンガモプテリスGangamopterisが報告されることがある。これは最初はゴンドワナ大陸から移動したものと考えられていたが,現在では相似た環境は相似た形態の植物を生むという一般原則からみて,移動よりはむしろ平行進化として解釈されている。…

※「Gangamopteris」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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