Anne Elliott's photos with the keyword: Nautilus
Curves
16 Feb 2010 |
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So, can you tell that I am feeling really fed up of grey days? Desperation once again leads to finding something at home to photograph, LOL.
Nautilus
26 Dec 2007 |
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I have posted three photos of the beautiful inside spiral pattern of this Nautilus shell. Thought it was time I posted the outside pattern.
"The nautilus is similar in general form to other cephalopods, with a prominent head and tentacles. Nautiluses typically have more tentacles than other cephalopods, up to ninety. These tentacles are arranged into two circles and, unlike the tentacles of other cephalopods, they have no suckers, are undifferentiated and retractable. The radula is wide and distinctively has nine teeth. There are two pairs of gills.
Nautilus pompilius is the largest species in the genus. One form from western Australia may reach 26.8 cm in diameter. However, most other nautilus species never exceed 20 cm. Nautilus macromphalus is the smallest species, usually measuring only 16 cm.
Nautiluses are the sole cephalopods whose bony structure of the body is externalized as a shell. The animal can withdraw completely into its shell, closing the opening with a leathery hood formed from two specially folded tentacles. The shell is coiled, calcareous, nacreous and pressure resistant (imploding at a depth of about 800 m). The nautilus shell is composed of 2 layers: the outer layer is a matte white, while the inner layer is a striking white with iridescence. The innermost portion of the shell is a pearlescent blue-gray.
The shell is internally divided into chambers. As the nautilus matures its body moves forward, sealing the camerae behind it with a new septum. The last fully open chamber, also the largest one, is used as the living chamber. The number of camerae increases from around four at the moment of hatching to thirty or more in adults.
The nautilus shell presents one of the finest natural examples of a logarithmic spiral." From Wikipedia.
For the observant
05 Nov 2007 |
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Now, who (of those who know me) will see what the title refers to? Taken this afternoon in my kitchen on a very gloomy day, so there was very little light. Tomorrow morning, I'd better start chanting: "Snow, snow, go away - let the sun come out today!" And so winter begins (again!)...
Coils
10 Nov 2007 |
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Think I need to take this shell outside to photograph it, as I think better light would help. Just playing with my new little Panasonic FZ18.
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