You can give the caption package the option labelformat=empty
to suppress the Figure 1 etc. labelling:
usepackage[labelformat=empty]{caption}
You can use square brackets to specify the description for the figure list, and curly brackets for the actual figure caption. So I think you should be able to do the following to supress the caption but still have an entry in the figure list:
egin{figure}
center
includegraphics[scale=0.5]{universidade}
caption[Mycaption]{}
end {figure}
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