  We derive a general expression for the entropy per particle as a function of
chemical potential, temperature and gap magnitude for the single layer
transition metal dichalcogenides. The electronic excitations in these materials
can be approximately regarded as two species of the massive or gapped Dirac
fermions. Inside the smaller gap there is a region with zero density of states
where the dependence of the entropy per particle on the chemical potential
exhibits a huge dip-and-peak structure. The edge of the larger gap is
accompanied by the discontinuity of the density of states that results in the
peak in the dependence of the entropy per particle on the chemical potential.
The specificity of the transition metal dichalcogenides makes possible the
observation of these features at rather high temperatures order of 100 K. The
influence of the uniaxial strain on the entropy per particle is discussed.
