A remark on a dynamical stochastic model in G. V. Schiaparelli's evolution theory.

It is well known that Giovanni Virginio Schiaparelli (1834-1910) wrote in 1898 an essay, Forme organiche naturali e forme geometriche pure. Studio comparativo, which was also appreciated by Vito Volterra (1860-1940). Recent studies have revised Schiaparelli's evolutionary ideas with new proposals and from this it is possible to obtain a dynamical (deterministic) model. In this paper I propose a related stochastic model (as toy model): thanks to this tool, we can describe a speciation phenomenology.