Padilla & Strauss, 2008). Therefore, elongated ellipticals are likely to be also characterised by angular momenta pointing in the direction of the plane of the sky roughly perpendicular to the major axis of the ellipsoid, as is the case for edge-on spiral galaxies. These last two types of galaxies will be the centre of the following analysis. We notice that the amplitude of the angular momentum of flattened spheroidals is likely to have a low amplitude relative to that of spiral galaxies.

The sample we selected to carry out our analysis is the spectroscopic SDSS-DR6, which contains a total of $\simeq 580,000$ galaxies with spectroscopic redshifts and photometry in five bands, $u,g,r,i,z$, as well as parameters determining the projected galaxy shapes consisting of the two semi-axes and the position angle of the ellipse that once convolved with the PSF (seeing) provides the best match to the photometric image of each individual galaxy. In the remainder of this paper, we only consider SDSS-DR6 galaxies within the redshift range $0.02<z<0.09$.

   Sample   Members   $n/10^{-3}$h$^{-3}$Mpc$^3$   Log$_{10}(M_{\rm host}/$h$^{-1}M_{\odot})$
  -------- --------- ---------------------------- --------------------------------------------
     O1     132000           $10.4\pm0.8$                   $12.50^{+0.30}_{-0.54}$
     O2      59300          $6.50\pm0.12$                   $13.06^{+0.19}_{-0.27}$
     O3      72700          $5.50\pm0.12$                   $11.40^{+0.56}_{-0.80}$
     O4      10900          $7.15\pm0.17$                   $12.19^{+0.45}_{-1.17}$
     O5      1400           $1.10\pm0.20$                   $12.67^{+0.28}_{-0.48}$

  : Observational samples 