Anatrepis - Anatrepis
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…a general term for fishes with hard exoskeletal armor that lived in the Paleozoic Era, including the jawless ostracoderms and jawed placoderms. The oldest is Anatolepis , found in the Late Cambrian strata. The armor of a typical armored fish is made up of three layers: an outer dentate layer, a bony middle layer, and a basal layer. From [Pteraspis]…The Pteraspis family includes the oldest vertebrate fossils in the world. Anatolepis , discovered in the late Cambrian strata of Wyoming, USA, is one such fossil. The body of Pteraspis is covered with bony armor. … From [Agnatha]...A fish about 10 to 40 cm long that lived from the Silurian to Devonian periods, its body is flattened vertically and covered with small protrusions like shield scales. The oldest fish in the world is the Anatolepis genus of the Pterotophore subclass, discovered in a late Cambrian layer. [Ueno Teruya]... *Some of the terminology explanations that mention "Anatrepis" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…古生代に生息した固い外骨格の装甲をもつ魚類の総称で，無顎綱の甲皮類ostracodermやあごのある板皮綱Placodermiに属する魚類が含まれる。最も古いものはカンブリア紀後期の地層から発見されているアナトレピスAnatolepisである。典型的な甲冑魚の装甲は3層からできており，外側の歯質の層と骨質の中層と基底層からなる。… 【プテラスピス】より…プテラスピスの仲間には世界最古の脊椎動物の化石が含まれる。アメリカ，ワイオミング州のカンブリア紀後期の地層から発見されたアナトレピスAnatolepisがそれである。プテラスピスの体は骨質の装甲で覆われている。… 【無顎類】より…シルル紀からデボン紀にかけて生息した10～40cmほどの魚で，体は縦扁し，楯鱗のような小さな突起で覆われている。 世界最古の魚類は翼甲亜綱のアナトレピス属Anatolepisのもので，カンブリア紀の後期の地層から発見されている。【上野 輝弥】。… ※「アナトレピス」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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