  The clustering properties of SCUBA-selected galaxies are investigated within
the framework of a unifying scheme relating the formation of QSOs and
spheroids. The theoretical angular correlation function is derived for
different bias functions, corresponding to different values of the ratio
$M_{halo}/M_{sph}$ between the mass of the dark halos hosting such galaxies and
the mass in stars produced at the end of the major star-formation burst. SCUBA
sources are predicted to be strongly clustered, with a clustering strength
increasing with mass. Comparisons with the best available measurements show
better fits for $M_{halo}/M_{sph}\simeq 100$. The model can also account for
the clustering of Lyman-break galaxies, seen as the optical counterpart of low-
to intermediate-mass primeval spheroidal galaxies. Best agreement is once again
obtained for high values of the $M_{halo}/M_{sph}$ ratio. We also discuss
implications for small scale fluctuations observed at different wavelengths by
forthcoming experiments such as the Planck mission aimed at mapping the Cosmic
Microwave Background (CMB).
