File:Turritella terebralis (fossil snail) (Early Miocene; near Bordeaux, France) 12 (45762776995).jpg

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Turritella terebralis Lamarck, 1799 - fossil snail shell from the Miocene of France. (apertural view; ~3.75 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, Turritellidae

Stratigraphy: unrecorded/undisclosed unit in the Burdigalian, Lower Miocene

Locality: unrecorded/undisclosed site in France (probably near Bordeaux in southwestern France)

See info. at:

<a href="https://en.wikipedia.org/wiki/Turritella" rel="noreferrer nofollow">en.wikipedia.org/wiki/Turritella</a>
Date
Source Turritella terebralis (fossil snail) (Early Miocene; near Bordeaux, France) 12
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/45762776995. It was reviewed on 4 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

4 November 2019

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current14:52, 4 November 2019Thumbnail for version as of 14:52, 4 November 2019906 × 2,284 (1.44 MB)Ainz Ooal Gown (talk | contribs)Transferred from Flickr via #flickr2commons

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