  We measure the effect of the environment on the intrinsic shapes of spiral
and elliptical galaxies by finding the 3D shape distribution and dust
extinction that fits better the projected shape of galaxies in different
environment. We find that spiral galaxies in groups are very similar to field
spirals with similar intrinsic properties (magnitudes, sizes and colours). But
for spirals in groups, those in denser environments or closer to the centre of
the group tend to have a more circular disc than similar galaxies in less dense
environments or far from the group centres. Also we find that central spiral
galaxies in their groups tend to be thinner than other similar spirals.
  For ellipticals, we do not find any important dependence of their shape on
their position in a group or on the local density. However, we find that
elliptical galaxies in groups tend to be more spherical than field ellipticals
with similar intrinsic properties.
  We find that, once in groups, the shape of member galaxies do not depend on
group mass, regardless of their morphological type.

Astrophysics of Galaxies