  We identify the supersymmetric extension of Weyl transformations in various
types of supergravities, the minimal, nonminimal and new minimal N=1 SUGRA in
4D, formulated in terms of superfields. Based also on previous results we
conclude that there are only two types of trace anomalies in nonminimal and new
minimal supergravities, which correspond to the two nontrivial cocycles of the
minimal supergravity and, when reduced to component form, to the well-known
squared Weyl density and Euler density. There are nevertheless in new minimal
supergravity other nontrivial cocycles which, however, are mapped to zero in
the minimal supergravity.
