File:Nautilus pompilius (chambered nautilus) (offshore from Broome, Western Australia) (24052390712).jpg
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Summary
| Description |
Nautilus pompilius Linnaeus, 1758 - chambered nautilus shell (BMSM 73298, Bailey-Matthews Shell Museum, Sanibel Island, Florida, USA) This shell is from one of only 6 living species of an entire group of molluscs - the nautiloids. Nautiloids are basically a squid in a shell. Most modern squids do not have an external hard shell, but the chambered nautilus does. The shell is composed of aragonite (CaCO3 - calcium carbonate). In the fossil record, most nautiloids had a long, straight, slightly tapering shell. Some fossil forms had slightly curved or open coiled or tightly coiled shells. The modern chambered nautilus shell is tightly coiled. All nautiloid shells are/were hollow, but they were separated into many chambers by curvilinear walls. A tube of tissue called the siphuncle runs through the shell's chambers - it passively pumps gas into or out of the chambers. Increased gas content within the shell's chambers results in a low-buoyancy body, and the organism rises in the water column. As water is added to the chambers by the siphuncle, the organism's body becomes heavier and it sinks. These changes do not occur quickly. Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea, Nautilidae Locality: offshore from Broome, northwestern Australia More info. at: en.wikipedia.org/wiki/Chambered_nautilus and en.wikipedia.org/wiki/Siphuncle |
| Date | |
| Source | Nautilus pompilius (chambered nautilus) (offshore from Broome, Western Australia) |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/24052390712. It was reviewed on 3 February 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:49, 3 February 2016 | | 2,042 × 2,649 (2.47 MB) | Patko erika | Transferred from Flickr via Flickr2Commons |
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