[Proj] About UTM projection: sphere, ellipsoid or both?

[José Luis García Pallero]

Hello,

If I execute proj -l=tmerc I can see the general information about the
transverse Mercator projection:

    tmerc : Transverse Mercator
        Cyl, Sph&Ell

An for the UTM information proj -l=utm

      utm : Universal Transverse Mercator (UTM)
        Cyl, Sph
        zone= south

As you can see, apparently the transverse Mercator is defined for the
sphere and the ellipsoid, but the UTM only for the sphere. But UTM
should be only a particular case of transverse mercator/Gauß-Krüger
projection.
Is this a bug in documentation or actually the UTM in proj is defined
only for the sphere?

Thanks

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José Luis García Pallero
jgpallero at gmail.com
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