Turritella terebralis (fossil snail) (Early Miocene; near Bordeaux, France) 7 : 無料・フリー素材/写真
Turritella terebralis (fossil snail) (Early Miocene; near Bordeaux, France) 7 / 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 | Turritella terebralis Lamarck, 1799 - fossil snail shell from the Miocene of France. (abapertural view; ~6.5 centimeters tall)Of all the molluscs, the gastropods (snails) have made the most ecological adaptations. They can be found in almost all fundamental environments: marine, freshwater, terrestrial. Most gastropods live in the ocean, and have a single, asymmetrically coiled, external shell of calcium carbonate (CaCO3 - usually aragonite). The hard calcareous shell is the most easily fossilized part of the gastropod. The soft parts of a snail (the “slug” portion) include a well developed head having eyes, tentacles, and a mouth, and a well developed, strong, muscular foot used principally for locomotion. The shell is carried upright on the snail’s back, or is partially dragged behind. When threatened by a predator, many snails can retract their soft parts into the shell’s interior for protection. Many fossil snails in the Paleozoic rock record are not well preserved, or are preserved as internal molds. The original aragonite of many gastropod shells is not stable on geologic time scales, and often recrystallizes or dissolves completely away. Fossil snail shells in Mesozoic and Cenozoic rocks are usually better preserved.Classification: Animalia, Mollusca, Gastropoda, TurritellidaeStratigraphy: unrecorded/undisclosed unit in the Burdigalian, Lower MioceneLocality: unrecorded/undisclosed site in France (probably near Bordeaux in southwestern France)--------------------------See info. at:en.wikipedia.org/wiki/Turritella |
| 撮影日 | 2019-01-09 10:10:40 |
| 撮影者 | James St. John |
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