A concept of a large spectrum of particle masses is suggested in order to discuss the problem of dark matter in the universe. Therefore, a simple scheme of particle classes can be formulated by using the Large Number Hypothesis bridging elementary and cosmological data. The proposed scheme includes a common approach for a rough distinction of groups of elementary particles, which can be distinguished by many orders of magnitudes of their rest masses. Probably, the maximal rest masses of

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... s as well as the masses of hypothetical heavy Weakly Interacting Massive Particles (WIMPs) can be included in the scheme. Under the assumption of the elementary character of the super-heavy particles, it is proposed to assume the formation of micro-black-holes by them contributing to the missed masses.