…The Orthoceratida (orthoceratida) also differentiated. The Bassleroceratida (basleroceratida), ancestors of the Nautilida, also differentiated from the Elesmeroceratiida early on. Paleozoic Nautilidae are often found in calcareous rocks formed in shallow seas. … *Some of the terminology that mentions "Bassleroceratida" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…オルトケラス目(直角石類)Orthoceratidaも分化した。オウムガイ目の先祖バスレロケラス目(バスラ角石類)Bassleroceratidaも,早くからエレスメロケラス目より分化した。 古生代のオウムガイ類は,浅海で形成された石灰質岩中に産することが多い。… ※「Bassleroceratida」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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