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Colors of other spectrums and beings geometrically organized

How many colors have other spectrums?

I know that the visible spectrum of light have 7 colors, but I don't know how many colors have the ultraviolet and the infrared spectrums.

I am doing my solar system, Emira, and in my system there are complex beings that depend on the ultraviolet spectrum to realize the photosintesis and to obtain sufficient energy for quimic reactions on animals.

These planets have an atmosphere 3 times more dense than the atmosphere of Earth, that increase the fusion point of fluoridric acid that these animals use as a solvent.

These beings breathe molecular fluorine ( F?) and live on temperatures less below than 0°C.

Their cells and bodies are geometrically organized and more organized than on beings of our planet. They have pigments on their cells and on skins that protect them from high ultraviolet and X-ray radiations. They have a cartilagenous and flexible skeleton instead of a skeleton made of calcium, that also protect them more against high radiations.

High Radiation for them is not a problem, and they can live in places where a human cannot live in ten minutes.

Enio,

The electromagnetic spectrum, which includes radio, infra-red, visible, ultraviolet and x-rays, has an infinite number of colors.

Specifying a color by name is an oversimplified way to describe light. The 7 color names you're probably thinking of (red, orange, yellow, green, blue, violet, indigo) are used in a very old and traditional way of describing colors which really doesn't work very well when you're trying to be accurate. In particular, indigo isn't used at all any more, although the other 6 color names are used in printing, movies and other commercial applications.

Astronomers often specify the wavelength of the radiation that they're interested in by using units of Angstroms (although that's not so common any more) or nano-meters.

http://hubblesite.org/sci.d.tech/nuts_.and._bolts/spec101.shtml
has a description of the electromagnetic spectrum and the associated wavelengths.

I hope this helps a little.