Nautiloid cephalopods (Paleozoic) 1 : 無料・フリー素材/写真
Nautiloid cephalopods (Paleozoic) 1 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | These fossils are straight-shelled nautiloid cephalopods - they were relatively common components of Paleozoic oceans. A nautiloid is basically a squid-in-a-shell. Most species had straight, gently tapering shells, but some had loosely coiled or tightly coiled shells. The shells were mostly hollow, aragonitic, and had regularly-spaced internal walls. The entire group is represented in today's oceans by five living species of chambered nautilus, all of which have a coiled shell: Nautilus pompilius, Nautilus macromphalus, Nautilus stenomphalus, Nautilus belauensis, and Allonautilus scrobiculatus.This material is derived from a Paleozoic quarry, probably in Ohio.Classification: Animalia, Mollusca, Cephalopoda, NautiloideaLocality: foot-worn paver stone on the northern side of Marion Station, Marion, Ohio, USA |
| 撮影日 | 2020-06-15 02:52:38 |
| 撮影者 | James St. John |
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