We discuss lowest weight representations of the SN-extended Heisenberg algebras underlying the N-body quantum-mechanical Calogero model. Our construction leads to fiat derivatives interpolating between Knizhnik-Zamolodchikov and Dunkl derivatives. It is argued that based on these results one can establish new links between solutions of the Knizhnik-Zamolodchikov equations and wave functions of the Calogero model.